Free DISA STIG and SRG Library | Vaulted

Microsoft Excel 2010

Version 1 Release 112
2018-04-272016-10-28
U_MSicrosoft_Office_Excel_2010_V1R2_STIG_VSCAP_1R-11_MaBenuchmalrk-xccdf.xml
Settings in this guidance assume a complete installation of Microsoft Office 2010 on the Windows 7 Platform. Registry paths and values identified in each control assume the use of Group Policy Administrative Templates. Installations not using Group Policies to administer Microsoft Office products may observe alternate registry paths for stored configuration values. Comments or proposed revisions to this document should be sent via e-mail to the following address: disa.stig_spt@mail.mil.

Compare Summary

Compare V1R11 to V1R2
  • All
  • Updated 46
  • Added 0
  • Removed 0

Vulnerabilities (46)

Disabling of user name and password syntax from being used in URLs must be enforced.

Finding ID
DTOO104 - Excel
Rule ID
SV-33402r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO104 - Disable user name and password
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

The Uniform Resource Locator (URL) standard allows user authentication to be included in URL strings in the form http://username:password@example.com. A malicious user might use this URL syntax to create a hyperlink that appears to open a legitimate Web site but actually opens a deceptive (spoofed) Web site. For example, the URL http://www.wingtiptoys.com@example.com appears to open http://www.wingtiptoys.com but actually opens http://example.com. To protect users from such attacks, Internet Explorer usually blocks any URLs using this syntax. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). If user names and passwords in URLs are allowed, users could be diverted to dangerous Web pages, which could pose a security risk.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Disable user name and password” to “Enabled” and place a check in the ‘excel.exe’ check box.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Disable user name and password” must be “Enabled” and a check in the ‘excel.exe’ check box must be present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_HTTP_USERNAME_PASSWORD_DISABLE Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Enabling IE Bind to Object functionality must be present.

Finding ID
DTOO111 - Excel
Rule ID
SV-33388r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO111 - Enable IE Bind to Object
CCI
CCI-001695
Target Key
(None)
Documentable
No
Discussion

Internet Explorer performs a number of safety checks before initializing an ActiveX control. It will not initialize a control if the kill bit for the control is set in the registry, or if the security settings for the zone in which the control is located do not allow it to be initialized. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). A security risk could occur if potentially dangerous controls are allowed to load.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Bind to Object” to “Enabled” and place a check in the ‘excel.exe’ check box.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Bind to Object” must be “Enabled” and a check in the ‘excel.exe’ check box must be present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_SAFE_BINDTOOBJECT Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Saved from URL mark to assure Internet zone processing must be enforced.

Finding ID
DTOO117 - Excel
Rule ID
SV-33416r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO117 - Saved from URL
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

Typically, when Internet Explorer loads a Web page from a Universal Naming Convention (UNC) share that contains a Mark of the Web (MOTW) comment, indicating the page was saved from a site on the Internet, Internet Explorer runs the page in the Internet security zone instead of the less restrictive Local Intranet security zone. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). If Internet Explorer does not evaluate the page for a MOTW, potentially dangerous code could be allowed to run.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Saved from URL” to “Enabled” and place a check in the ‘excel.exe’ check box.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Saved from URL” must be “Enabled” and a check in the ‘excel.exe’ check box must be present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_UNC_SAVEDFILECHECK Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Navigation to URL's embedded in Office products must be blocked.

Finding ID
DTOO123 - Excel
Rule ID
SV-33409r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO123-Block Navigation to URL from Office
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

To protect users from attacks, Internet Explorer usually does not attempt to load malformed URLs. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). If Internet Explorer attempts to load a malformed URL, a security risk could occur in some cases.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Navigate URL” to “Enabled” and place a check in the ‘excel.exe’ check box.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Navigate URL” must be “Enabled” and a check in the ‘excel.exe’ check box must be present. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_VALIDATE_NAVIGATE_URL Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Links that invoke instances of IE from within an Office product must be blocked.

Finding ID
DTOO129 - Excel
Rule ID
SV-33393r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO129 - Block Pop-Ups
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

The Pop-up Blocker feature in Internet Explorer can be used to block most unwanted pop-up and pop-under windows from appearing. This functionality can be controlled separately for instances of Internet Explorer spawned by Office applications (for example, if a user clicks a link in an Office document or selects a menu option that loads a Web page). If the Pop-up Blocker is disabled, disruptive and potentially dangerous pop-up windows could load and present a security risk.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Block popups” to “Enabled” and select ‘excel.exe’.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Block popups” must be “Enabled” and ‘excel.exe’ is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_WEBOC_POPUPMANAGEMENT Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Trust Bar Notifications for unsigned application add-ins must be blocked.

Finding ID
DTOO131 - Excel
Rule ID
SV-33442r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO131 - Trust Bar Notifications
CCI
CCI-001749
Target Key
(None)
Documentable
No
Discussion

If an application is configured to require all add-ins be signed by a trusted publisher, any unsigned add-ins the application loads will be disabled and the application will display the Trust Bar at the top of the active window. The Trust Bar contains a message informing users about the unsigned add-in.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Disable Trust Bar Notification for unsigned application add-ins and block them” to “Enabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Disable Trust Bar Notification for unsigned application add-ins and block them” must be “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value NoTBPromptUnsignedAddin is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Pre-release versions of file formats new to Office Products must be blocked.

Finding ID
DTOO210 - Excel
Rule ID
SV-33448r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO210 - Block opening of pre-release versions
CCI
CCI-001764
Target Key
(None)
Documentable
No
Discussion

The Microsoft Office Compatibility Pack for Excel 2010 File Formats installed can open Office Open XML files saved with pre-release versions of Excel 2010. Excel Open XML files usually have the following extensions: .xlsx, .xlsm, .xltx, .xltm, .xlam.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Office 2010 Converters “Block opening of pre-release versions of file formats new to Excel 2010 through the Compatibility Pack for Office 2010 and Excel 2010 Converter” to “Enabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Office 2010 -> Office 2010 Converters “Block opening of pre-release versions of file formats new to Excel 2010 through the Compatibility Pack for Office 2010 and Excel 2010 Converter” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value Excel12BetaFilesFromConverters is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

All automatic loading from Trusted Locations must be disabled.

Finding ID
DTOO133 - Excel
Rule ID
SV-33447r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO133-Disable all trusted locations
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

Trusted locations specified in the Trust Center are used to define file locations assumed to be safe. Content, code, and add-ins are allowed to load from trusted locations with a minimal amount of security, without prompting the users for permission. If a dangerous file is opened from a trusted location, it will not be subject to standard security measures and could harm users' computers or data. By default, files located in trusted locations (those specified in the Trust Center) are assumed to be safe.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Trusted Locations “Disable all trusted locations” to “Enabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Trusted Locations “Disable all trusted locations” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\trusted locations Criteria: If the value AllLocationsDisabled is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Force encrypted macros to be scanned in open XML documents must be determined and configured.

Finding ID
DTOO142 - Excel
Rule ID
SV-33441r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO142 - Force Scan Encr. Macros in open XML
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

When an Office Open XML document (Word, Excel, and PowerPoint) is rights-managed, or password-protected, any macros embedded in the document are encrypted along with the rest of the contents. By default, these encrypted macros will be disabled unless they are scanned by antivirus software immediately before being loaded. If this default configuration is modified, Office products will not require encrypted macros to be scanned before loading. They will be handled as specified by the Office System macro security settings, which can cause macro viruses to load undetected and lead to data loss or reduced application functionality.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Scan encrypted macros in Excel Open XML workbooks” to “Enabled: Scan encrypted macros (default)”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Scan encrypted macros in Excel Open XML workbooks” must be “Enabled: Scan encrypted macros (default)”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value ExcelBypassEncryptedMacroScan is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Disallowance of Trusted Locations on the network must be enforced.

Finding ID
DTOO134 - Excel
Rule ID
SV-33446r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO134 - Trusted locations on computer
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

Files located in Trusted Locations and specified in the Trust Center are assumed to be safe. Content, code, and add-ins are allowed to load from Trusted Locations with minimal security and without prompting the user for permission. By default, users can specify Trusted Locations on network shares, or in other remote locations not under their direct control, by selecting the “Allow Trusted Locations on my network” (not recommended) check box in the Trusted Locations section of the Trust Center. If a dangerous file is opened from a trusted location, it will not be subject to typical security measures and could affect users' computers or data.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Trusted Locations “Allow Trusted Locations on the network" to “Disabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Trusted Locations “Allow Trusted Locations on the network" must be set to “Disabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\trusted locations Criteria: If the value AllowNetworkLocations is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Save files default format must be configured.

Finding ID
DTOO139 - Excel
Rule ID
SV-33437r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO139 - Save files default format
CCI
CCI-000381
Target Key
(None)
Documentable
No
Discussion

When users create new Excel files, Excel 2010 saves them in the new *.xlsx format. Ensure this setting is enabled to specify all new files are created in Excel 2010. If a new file is created in an earlier format, some users may not be able to open or use the file, or they may choose a format this is less secure than the Excel 2010 format. Users can still select a specific format when they save files, but they cannot change default of this setting from the Excel Options dialog box. This enforced user behavior ensures any change to the file format requires additional deliberate user interaction.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Save "default file format" to "Enabled (Excel Workbook *.xlsx)".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Save "default file format" must be set to "Enabled (Excel Workbook *.xlsx)". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options Criteria: If the value DefaultFormat is REG_DWORD = 0x00000033(hex) or 51 (Decimal), this is not a finding.

Responsibility

System Administrator

Trust access for VBA must be disallowed.

Finding ID
DTOO146 - Excel
Rule ID
SV-33444r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO146-Disable Trust access to VB Project Macros
CCI
CCI-000381
Target Key
(None)
Documentable
No
Discussion

VSTO projects require access to the Visual Basic for Applications project system in Excel, PowerPoint, and Word, even though the projects do not use Visual Basic for Applications. Design-time support of controls in both Visual Basic and C# projects depends on the Visual Basic for Applications project system in Word and Excel. By default, Excel, Word, and PowerPoint do not allow automation clients to have programmatic access to VBA projects. Users can enable this by selecting the Trust access to the VBA project object model in the Macro Settings section of the Trust Center. However, doing so allows macros in any documents the user opens to access the core Visual Basic objects, methods, and properties, which represents a potential security hazard.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Trust access to Visual Basic Project” to “Disabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Trust access to Visual Basic Project” must be set to “Disabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value AccessVBOM is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Warning Bar settings for VBA macros must be configured.

Finding ID
DTOO304 - Excel
Rule ID
SV-33445r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO304 - VBA Macro Warning settings
CCI
CCI-000381
Target Key
(None)
Documentable
No
Discussion

When users open files containing VBA Macros, applications open the files with the macros disabled and displays the Trust Bar with a warning that macros are present and have been disabled. Users may then enable these macros by clicking Options on the Trust Bar and selecting the option to enable them. Disabling or not configuring this setting may allow dangerous macros to become active on user computers or the network.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “VBA Macro Notification Settings” to “Enabled: Disable all with notification".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “VBA Macro Notification Settings” must be “Enabled: Disable all with notification". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value VBAWarnings is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

File types must be configured to provide mismatch warnings.

Finding ID
DTOO143 - Excel
Rule ID
SV-33440r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO143 - Force File Extension to match type
CCI
CCI-001243
Target Key
(None)
Documentable
No
Discussion

Excel can load files with extensions that do not match the files' type. For example, if a comma-separated values (CSV) file named example.csv is renamed example.xls, Excel can properly load it as a CSV file. Some attacks target specific file formats. If Excel is allowed to load files with extensions that do not match their file types, a malicious person can deceive users into loading dangerous files that have incorrect extensions. By default, if users attempt to open files with the wrong extension, Excel opens the file and displays a warning that the file type is not what Excel expected.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Force file extension to match file type” to “Enabled (Allow different, but warn)”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Force file extension to match file type” must be set to “Enabled (Allow different, but warn)”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value ExtensionHardening is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Internet links and Network UNCs created as embedded hyperlinks must be prevented.

Finding ID
DTOO138 - Excel
Rule ID
SV-33436r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO138 - Internet and Network Path hyperlinks
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

When users type a string of characters, Excel recognizes as a Uniform Resource Locator (URL) or Uniform Naming Convention (UNC) path to a resource on the Internet or a local network, Excel will transform it into a hyperlink. Clicking the hyperlink opens it in the configured default Web browser or the appropriate application. This functionality can enable users to accidentally create links to dangerous or restricted resources, which could create a security risk.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Proofing -> Autocorrect Options “Internet and network paths as hyperlinks” to “Disabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Proofing -> Autocorrect Options “Internet and network paths as hyperlinks” must be set to “Disabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options If the value AutoHyperlink is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Automatic republish to web pages must be disallowed.

Finding ID
DTOO140 - Excel
Rule ID
SV-33438r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO140 - Disable AutoRepublish
CCI
CCI-000366
Target Key
(None)
Documentable
No
Discussion

If users choose to publish Excel data to a static Web page and enable the AutoRepublish feature, Excel saves a copy of the data to the Web page every time the user saves the workbook. If the page is on a Web server, anyone who has access to the page will be able to see the updated data after every save, which can lead to the undesired disclosure of sensitive or incorrect information. By default, a message dialog box displays every time the user saves a published workbook when AutoRepublish is enabled. From this dialog box, the user can disable AutoRepublish temporarily or permanently, or select "Do not show this message again" to prevent the dialog box from appearing after every save. If the user selects “Do not show this message again”, Excel will continue to automatically republish the data after every save without informing the user.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Save “Disable AutoRepublish” to “Enabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Save “Disable AutoRepublish” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options Criteria: If the value DisableAutoRepublish is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Update of automatic links must be configured to prompt.

Finding ID
DTOO150 - Excel
Rule ID
SV-33434r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO150 - Automatic Link Updates
CCI
CCI-001243
Target Key
(None)
Documentable
No
Discussion

If an Excel workbook contains links to other documents and users are not prompted to approve them, the contents of the workbook might change without the users' knowledge because the linked files have changed. By default, users are prompted to update automatic links.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Advanced “Ask to update automatic links” to “Enabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Advanced “Ask to update automatic links” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options\binaryoptions Criteria: If the value fUpdateExt_78_1 is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

AutoRepublish Warning Alert must be provided.

Finding ID
DTOO141 - Excel
Rule ID
SV-33439r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO141 - AutoRepublish Warning Alert
CCI
CCI-000366
Target Key
(None)
Documentable
No
Discussion

AutoRepublish is a feature in Excel allowing workbooks to be automatically republished to the World Wide Web each time the workbook is saved. A number of changes might need to be made to allow the workbook to be successfully published, including the following: • External references are converted to values. • Hidden formulas become visible. • The Set precision as displayed option, which appears beneath the “When calculating this workbook” heading in the Advanced section of the Excel Options dialog box, is no longer available. These types of changes can mean the version on the Web page might not be the same as the Excel file. By default, a message dialog box appears every time the user saves a published workbook when AutoRepublish is enabled. From this dialog box, the user can disable AutoRepublish temporarily or permanently, or select “Do not show this message again” to prevent the dialog box from appearing after every save. If the user selects “Do not show this message again”, Excel will continue to automatically republish the data after every save without informing the user.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Save “Do not show AutoRepublish warning alert” to “Disabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Save “Do not show AutoRepublish warning alert” must be set to “Disabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options Criteria: If the value DisableAutoRepublishWarning is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Load pictures from Web pages must be disallowed.

Finding ID
DTOO152 - Excel
Rule ID
SV-33435r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO152 - Load pics from Web not in Excel
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

When users open Web pages in Excel, Excel loads any graphics included in the pages, regardless of whether they were originally created in Excel. Allowing Excel to load graphics created in other programs can make Excel vulnerable to possible future zero-day attacks using graphic files as an attack vector. If such an event occurs, this setting can be used to mitigate the vulnerability.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Advanced -> Web Options -> General “Load pictures from Web pages not created in Excel” to “Disabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Advanced -> Web Options -> General “Load pictures from Web pages not created in Excel” must be set to “Disabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\internet Criteria: If the value DoNotLoadPictures is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Macro storage must be in Personal macro workbooks.

Finding ID
DTOO145 - Excel
Rule ID
SV-33443r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO145 - Store macro in workbook
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

The Record Macro dialog box includes a drop-down menu allowing users to choose whether to store the new macro in the current workbook, a new workbook, or their personal macro workbook (Personal.xlsb), a hidden workbook that opens every time Excel starts. By default, Excel displays the Record Macro dialog box with “This Workbook already selected” in the drop-down menu. If a user saves a macro in the active workbook and then distributes the workbook to others, the macro is distributed along with the workbook, which could put workbook data at risk if the macro is triggered accidentally or intentionally.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Store macro in Personal Macro Workbook by default” to “Enabled”.

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Store macro in Personal Macro Workbook by default” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options\binaryoptions Criteria: If the value fGlobalSheet_37_1 is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Add-on Management functionality must be allowed.

Finding ID
DTOO126 - Excel
Rule ID
SV-33780r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO126 - Add-on Management
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

Internet Explorer add-ons are pieces of code, run in Internet Explorer, to provide additional functionality. Rogue add-ons may contain viruses or other malicious code. Disabling or not configuring this setting could allow malicious code or users to become active on user computers or the network. For example, a malicious user can monitor and then use keystrokes users type into Internet Explorer. Even legitimate add-ons may demand resources, compromising the performance of Internet Explorer, and the operating systems for user computers.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Add-on Management” to “Enabled” and ‘excel.exe’ is checked.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Add-on Management” must be set to “Enabled” and ‘excel.exe’ is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_ADDON_MANAGEMENT Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Protection from zone elevation must be enforced.

Finding ID
DTOO209 - Excel
Rule ID
SV-33785r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO209 - Zone Elevation Protection
CCI
CCI-001695
Target Key
(None)
Documentable
No
Discussion

Internet Explorer places restrictions on each web page users can use the browser to open. Web pages on a user's local computer have the fewest security restrictions and reside in the Local Machine zone, making this security zone a prime target for malicious users and code. Disabling or not configuring this setting could allow pages in the Internet zone to navigate to pages in the Local Machine zone to then run code to elevate privileges. This could allow malicious code or users to become active on user computers or the network.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Protection From Zone Elevation” to “Enabled” and 'excel.exe' is checked.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Protection From Zone Elevation” must be set to “Enabled” and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_ZONE_ELEVATION Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

ActiveX Installs must be configured for proper restriction.

Finding ID
DTOO211 - Excel
Rule ID
SV-33791r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO211 - Restrict ActiveX Install
CCI
CCI-002460
Target Key
(None)
Documentable
No
Discussion

Microsoft ActiveX controls allow unmanaged, unprotected code to run on the user computers. ActiveX controls do not run within a protected container in the browser like the other types of HTML or Microsoft Silverlight-based controls. Disabling or not configuring this setting does not block prompts for ActiveX control installations and these prompts display to users. This could allow malicious code to become active on user computers or the network.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Restrict ActiveX Install” to “Enabled” and 'excel.exe' is checked.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Restrict ActiveX Install” must be set to “Enabled” and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_RESTRICT_ACTIVEXINSTALL Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

File Downloads must be configured for proper restrictions.

Finding ID
DTOO132 - Excel
Rule ID
SV-33798r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO132 - Restrict File Download
CCI
CCI-001169
Target Key
(None)
Documentable
No
Discussion

Disabling this setting allows websites to present file download prompts via code without the user specifically initiating the download. User preferences may also allow the download to occur without prompting or interacting with the user. Even if Internet Explorer prompts the user to accept the download, some websites abuse this functionality. Malicious websites may continually prompt users to download a file or present confusing dialog boxes to trick users into downloading or running a file. If the download occurs and it contains malicious code, the code could become active on user computers or the network.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Restrict File Download” to “Enabled” and 'excel.exe' is checked.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Restrict File Download” must be set to “Enabled” and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_RESTRICT_FILEDOWNLOAD Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Scripted Window Security must be enforced.

Finding ID
DTOO124 - Excel
Rule ID
SV-33803r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO124 - Scripted Window Security
CCI
CCI-001695
Target Key
(None)
Documentable
No
Discussion

Malicious websites often try to confuse or trick users into giving a site permission to perform an action allowing the site to take control of the users' computers in some manner. Disabling or not configuring this setting allows unknown websites to: -Create browser windows appearing to be from the local operating system. -Draw active windows displaying outside of the viewable areas of the screen capturing keyboard input. -Overlay parent windows with their own browser windows to hide important system information, choices or prompts.

Fix Text

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Scripted Window Security Restrictions” to “Enabled” and 'excel.exe' is checked.

Check Content

The policy value for Computer Configuration -> Administrative Templates -> Microsoft Office 2010 (Machine) -> Security Settings -> IE Security “Scripted Window Security Restrictions” must be set to “Enabled” and 'excel.exe' is checked. Procedure: Use the Windows Registry Editor to navigate to the following key: HKLM\Software\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_WINDOW_RESTRICTIONS Criteria: If the value excel.exe is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Application add-ins must be signed by Trusted Publisher.

Finding ID
DTOO127 - Excel
Rule ID
SV-33850r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO127 - Add-ins are signed by Trusted Publisher
CCI
CCI-001749
Target Key
(None)
Documentable
No
Discussion

Office 2010 applications do not check the digital signature on application add-ins before opening them. Disabling or not configuring this setting may allow an application to load a dangerous add-in. As a result, malicious code could become active on user computers or the network.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Require that application add-ins are signed by Trusted Publisher” to “Enabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Require that application add-ins are signed by Trusted Publisher” must be set to “Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value RequireAddinSig is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Data Execution Prevention must be enforced.

Finding ID
DTOO128 - Excel
Rule ID
SV-33855r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO128 - Data Execution Prevention
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

Data Execution Prevention (DEP) is a set of hardware and software technologies performing additional checks on memory to help prevent malicious code from running on a system. The primary benefit of DEP is to help prevent code execution from data pages. Enabling this setting, turns off Data Execution Prevention. As a result, malicious code takes advantage of code injection or buffer overflow vulnerabilities possibly exploiting the computer.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Turn off Data Execution Prevention” to “Disabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center “Turn off Data Execution Prevention” must be set to “Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security Criteria: If the value EnableDEP is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Corrupt workbook options must be disallowed.

Finding ID
DTOO118 - Excel
Rule ID
SV-34625r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO118 - Do not show data extraction options
CCI
CCI-000366
Target Key
(None)
Documentable
No
Discussion

This setting controls whether Excel presents users with a list of data extraction options before beginning an Open and Repair operation when users choose to open a corrupt workbook in repair or extract mode.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Data Recovery “Do not show data extraction options when opening corrupt workbooks” to “Enabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Data Recovery “Do not show data extraction options when opening corrupt workbooks” must be set to “Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\options Criteria: If the value ExtractDataDisableUI is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Configuration for file validation must be enforced.

Finding ID
DTOO119 - Excel
Rule ID
SV-33874r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO119 - Turn off file validation
CCI
CCI-001695
Target Key
(None)
Documentable
No
Discussion

Office Binary Documents (97-2003) are checked to see if they conform against the file format schema before they are opened.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Turn off file validation” to “Disabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security “Turn off file validation” must be set to “Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\filevalidation Criteria: If the value EnableOnLoad is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Open/Save actions for dBase III / IV files must be blocked.

Finding ID
DTOO122 - Excel
Rule ID
SV-34230r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO122 - dBase III / IV files
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “dBase III / IV files” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “dBase III / IV files” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value DBaseFiles is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Dif and Sylk files must be blocked.

Finding ID
DTOO112 - Excel
Rule ID
SV-34238r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO112 - Dif and Sylk files
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Dif and Sylk files” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Dif and Sylk files” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value DifandSylkFiles is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 2 macrosheets and add-in files must be blocked.

Finding ID
DTOO113 - Excel
Rule ID
SV-34239r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO113 - Macrosheets and add-in files
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 2 macrosheets and add-in files” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 2 macrosheets and add-in files” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL2Macros is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 2 worksheets must be blocked.

Finding ID
DTOO114 - Excel
Rule ID
SV-34253r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO114 - Excel 2 worksheets
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 2 worksheets” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 2 worksheets” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL2Worksheets is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 3 macrosheets and add-in files must be blocked.

Finding ID
DTOO115 - Excel
Rule ID
SV-34255r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO115 - Excel 3 macrosheets and add-in files
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 3 macrosheets and add-in files” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 3 macrosheets and add-in files” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL3Macros is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 3 worksheets must be blocked.

Finding ID
DTOO116 - Excel
Rule ID
SV-34259r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO116 - Excel 3 worksheets
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 3 worksheets” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 3 worksheets” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL3Worksheets is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 4 macrosheets and add-in files must be blocked.

Finding ID
DTOO105 - Excel
Rule ID
SV-34269r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO105 - Excel 4 macrosheets and add-in files
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 macrosheets and add-in files” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 macrosheets and add-in files” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL4Macros is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 4 workbooks must be blocked.

Finding ID
DTOO106 - Excel
Rule ID
SV-34272r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO106 - Excel 4 workbooks
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 workbooks” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 workbooks” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL4Workbooks is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Excel 4 worksheets must be blocked.

Finding ID
DTOO107 - Excel
Rule ID
SV-34275r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO107 - Excel 4 worksheets
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 worksheets” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 4 worksheets” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL4Worksheets is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Actions for Excel 95 workbooks must be configured to edit in protected view.

Finding ID
DTOO108 - Excel
Rule ID
SV-34277r2_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO108 - Excel 95 workbooks
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 95 workbooks” to “Enabled: Allow editing and open in Protected View".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 95 workbooks” must be “Enabled: Allow editing and open in Protected View". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value XL95Workbooks is REG_DWORD = 5, this is not a finding.

Responsibility

System Administrator

Actions for Excel 95-97 workbooks and templates must be configured to edit in protected view.

Finding ID
DTOO109 - Excel
Rule ID
SV-34279r2_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO109 - Excel 95-97 workbooks and templates
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 95-97 workbooks and templates” to “Enabled: Allow editing and open in Protected View".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Excel 95-97 workbooks and templates” must be “Enabled: Allow editing and open in Protected View". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\office\14.0\excel\security\fileblock Criteria: If the value XL9597WorkbooksandTemplates is REG_DWORD = 5, this is not a finding.

Responsibility

System Administrator

Blocking as default file block opening behavior must be enforced.

Finding ID
DTOO110 - Excel
Rule ID
SV-33872r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO110 - Set default file block behavior
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

Users can open, view, or edit a large number of file types in Excel 2010. Some file types are safer than others, as some could allow malicious code to become active on user computers or the network. For this reason, disabling or not configuring this setting could allow malicious code to become active on user computers or the network.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Set default file block behavior” to “Enabled: Blocked files are not opened".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Set default file block behavior” must be “Enabled: Blocked files are not opened". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value OpenInProtectedView is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Open/Save actions for Web pages and Excel 2003 XML spreadsheets must be blocked.

Finding ID
DTOO120 - Excel
Rule ID
SV-34282r2_rule
Severity
Cat III
CCE
(None)
Group Title
DTOO120 -Web pages and Excel 2003 XML spreadsheets
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining whether users can open, view, edit, or save Excel files with the format specified by the title. If enabling this policy setting, specify whether users can open, view, edit, or save files. The options that can be selected are below. Note: Not all options may be available for this policy setting. - Do not block: The file type will not be blocked. - Save blocked: Saving of the file type will be blocked. - Open/Save blocked, use open policy: Both opening and saving of the file type will be blocked. The file will open based on the policy setting configured in the "default file block behavior" key. - Block: Both opening and saving of the file type will be blocked, and the file will not open. - Open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit the file type will not be enabled. - Allow editing and open in Protected View: Both opening and saving of the file type will be blocked, and the option to edit will be enabled. If you disable or do not configure this policy setting, the file type will not be blocked.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Web pages and Excel 2003 XML spreadsheets” to “Enabled: Open/Save blocked, use open policy".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> File Block Settings “Web pages and Excel 2003 XML spreadsheets” must be “Enabled: Open/Save blocked, use open policy". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\fileblock Criteria: If the value HtmlandXmlssFiles is REG_DWORD = 2, this is not a finding.

Responsibility

System Administrator

Files from the Internet zone must be opened in Protected View.

Finding ID
DTOO121 - Excel
Rule ID
SV-33861r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO121 - Files from the Internet zone
CCI
CCI-001662
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining if files downloaded from the Internet zone open in Protected View. If enabling this policy setting, files downloaded from the Internet zone do not open in Protected View. If disabling or not configuring this policy setting, files downloaded from the Internet zone open in Protected View.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Do not open files from the Internet zone in Protected View” to “Disabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Do not open files from the Internet zone in Protected View” must be set to “Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\protectedview Criteria: If the value DisableInternetFilesInPV is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Files in unsafe locations must be opened in Protected View.

Finding ID
DTOO288 - Excel
Rule ID
SV-33864r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO288 - Files in unsafe locations
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

This policy setting determines if files located in unsafe locations will open in Protected View. If unsafe locations have not been specified, only the "Downloaded Program Files" and "Temporary Internet Files" folders are considered unsafe locations. If enabling this policy setting, files located in unsafe locations do not open in Protected View. If disabling or not configuring this policy setting, files located in unsafe locations open in Protected View.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Do not open files in unsafe locations in Protected View” to “Disabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Do not open files in unsafe locations in Protected View” must be set to “Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\protectedview Criteria: If the value DisableUnsafeLocationsInPV is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator

Document behavior if file validation fails must be set.

Finding ID
DTOO292 - Excel
Rule ID
SV-33867r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO292 - Set document behavior
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

This policy key controls the behavior of how Office documents should be handled when failing File Validation. The options available are: -Block files completely. This will prevent users from opening files. -Open files in Protected View and disallow edit. This will prevent users from editing the files. -Open files in Protected view and allow edit. This will allow users to edit the files. If disabling or not configuring this policy setting, the default setting will be, "open files in protected view and allow edit".

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Set document behavior if file validation fails” to "Enabled: Open in Protected View" and Unchecked for "Do not allow edit".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Set document behavior if file validation fails” must be "Enabled: Open in Protected View" and Unchecked for "Do not allow edit". Procedure: Use the Windows Registry Editor to navigate to the following keys: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\filevalidation Criteria: If the value OpenInProtectedView is REG_DWORD = 1, this is not a finding. AND HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\filevalidation Criteria: If the value DisableEditFromPV is REG_DWORD = 1, this is not a finding.

Responsibility

System Administrator

Attachments opened from Outlook must be in Protected View.

Finding ID
DTOO293 - Excel
Rule ID
SV-33870r1_rule
Severity
Cat II
CCE
(None)
Group Title
DTOO293 - Turn off Protected View for attachments
CCI
CCI-001170
Target Key
(None)
Documentable
No
Discussion

This policy setting allows for determining if Excel files in Outlook attachments open in Protected View. If enabling this policy setting, Outlook attachments do not open in Protected View. If disabling or not configuring this policy setting, Outlook attachments open in Protected View.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Turn off Protected View for attachments opened from Outlook” to “Disabled".

Check Content

The policy value for User Configuration -> Administrative Templates -> Microsoft Excel 2010 -> Excel Options -> Security -> Trust Center -> Protected View “Turn off Protected View for attachments opened from Outlook” must be set to “Disabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\excel\security\protectedview Criteria: If the value DisableAttachmentsInPV is REG_DWORD = 0, this is not a finding.

Responsibility

System Administrator