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V-80137

Adobe Acrobat Pro DC Classic Default Handler changes must be disabled.

Finding ID
AADC-CL-001280
Rule ID
SV-94841r1_rule
Severity
Cat III
CCE
(None)
Group Title
SRG-APP-000133
CCI
CCI-001499
Target Key
(None)
Documentable
No
Discussion

Acrobat Pro allows users to change the version of Acrobat Pro that is used to read PDF files. This is a risk if multiple versions of Acrobat are installed on the system and the other version has dissimilar security configurations or known vulnerabilities. When the Default PDF Handler is disabled, the end users will not be able to change the default PDF viewer.

Fix Text

Configure the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \Software\Policies\Adobe\Adobe Acrobat\2015\FeatureLockDown Value Name: bDisablePDFHandlerSwitching Type: REG_DWORD Value: 1 Configure the policy value for Computer Configuration > Administrative Template > Adobe Acrobat Pro DC Classic > Preferences > General > 'Disable PDF handler switching' to 'Enabled'. This policy setting requires the installation of the AcrobatProDCClassic custom templates included with the STIG package. "AcrobatProDCClassic.admx" and "AcrobatProDCClassic.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

Check Content

Verify the following registry configuration: Using the Registry Editor, navigate to the following: HKEY_LOCAL_MACHINE\Software\Policies\Adobe\Adobe Acrobat\2015\FeatureLockDown Value Name: bDisablePDFHandlerSwitching Type: REG_DWORD Value: 1 If the value for bDisablePDFHandlerSwitching is not set to "1" and Type is not configured to REG_DWORD or does not exist, this is a finding. GUI path: Edit > Preferences > General > Verify the 'Select As Default PDF Handler' option is greyed out (locked). If the option is not greyed out, this is a finding. Admin Template path: Computer Configuration > Administrative Template > Adobe Acrobat Pro DC Classic > Preferences > General > 'Disable PDF handler switching' must be set to 'Enabled'. This policy setting requires the installation of the AcrobatProDCClassic custom templates included with the STIG package. "AcrobatProDCClassic.admx" and "AcrobatProDCClassic.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.