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V-65809

Adobe Reader DC must disable periodical uploading of Adobe certificates.

Finding ID
ARDC-CL-000335
Rule ID
SV-80299r1_rule80299r2_rule
Severity
Cat III
CCE
(None)
Group Title
SRG-APP-000427
CCI
CCI-002470
Target Key
(None)
Documentable
No
Discussion

By default, the user can update Adobe certificates from an Adobe server through the GUI. When uploading Adobe certificates is disabled, it prevents the automatic download and installation of certificates and disables and locks the end user's ability to upload those certificates.

Fix Text

Configure the following registry value: Note: The Key Names "cDigSig" and "cAdobeDownload" are not created by default in the Adobe Reader DC install and must be created. Registry Hive: HKEY_CURRENT_USER Registry Path: \Software\Adobe\Acrobat Reader\2015\Security\cDigSig\cAdobeDownload Value Name: bLoadSettingsFromURL Type: REG_DWORD Value: 0 Configure the policy value for User Configuration > Administrative Templates > Adobe Reader DC Classic > Preferences > Trust Manager > 'Load trusted certificates from an Adobe AATL server' to 'Disabled'. This policy setting requires the installation of the AcrobatDCClassic custom templates included with the STIG package. "AcrobatDCClassic.admx" and "AcrobatDCClassic.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

Check Content

Verify the following registry configuration: Note: The Key Names "cDigSig" and "cAdobeDownload" are not created by default in the Adobe Reader DC install and must be created. Utilizing the Registry Editor, navigate to the following: HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\2015\Security\cDigSig\cAdobeDownload Value Name: bLoadSettingsFromURL Type: REG_DWORD Value: 0 If the value for bLoadSettingsFromURL is not set to “0” and Type configured to REG_DWORD or does not exist, then this is a finding. GUI path: Edit > Preferences > Trust Manager > In the 'Automatic Adobe Approved Trust List (AATL) Updates' section > verify the 'Load trusted certificates from an Adobe AATL server' is not checked. If the box is checked, this is a finding. Admin Template path: User Configuration > Administrative Templates > Adobe Reader DC Classic > Preferences > Trust Manager > 'Load trusted certificates from an Adobe AATL server' must be set to 'Disabled'. This policy setting requires the installation of the AcrobatDCClassic custom templates included with the STIG package. "AcrobatDCClassic.admx" and "AcrobatDCClassic.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.