Adobe Reader DC must Block Websites.

From Adobe Acrobat Reader DC Continuous Track Security Technical Implementation Guide

Part of SRG-APP-000112

Associated with: CCI-001166 CCI-001169 CCI-001170 CCI-001662 CCI-001695

SV-79417r3_rule Adobe Reader DC must Block Websites.

Vulnerability discussion

Clicking any link to the Internet poses a potential security risk. Malicious websites can transfer harmful content or silently gather data. Acrobat Reader documents can connect to websites which can pose a potential threat to DoD systems and that functionality must be blocked. However, PDF document workflows that are trusted (e.g., DoD-created) can benefit from leveraging legitimate website access with minimal risk. Therefore, the ISSO may approve of website access and accept the risk if the access provides benefit and is a trusted site or the risk associated with accessing the site has been mitigated.Adobe Reader must block access to all websites that are not specifically allowed by ISSO risk acceptance.Satisfies: SRG-APP-000112, SRG-APP-000206, SRG-APP-000207, SRG-APP-000209, SRG-APP-000210

Check content

Verify the following registry configuration: Utilizing the Registry Editor, navigate to the following: HKEY_LOCAL_MACHINE\Software\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown\cDefaultLaunchURLPerms Value Name: iURLPerms Type: REG_DWORD Value: 1 Value: 0 - only with a documented ISSO risk acceptance. If the value for “iURLPerms” is set to “0” and a documented ISSO risk acceptance approving access to websites is provided, this is not a finding. If the value for “iURLPerms” is not set to “1” and “Type” configured to “REG_DWORD” or does not exist, this is a finding. GUI path: Edit >> Preferences >> Trust Manager >> In the "Internet Access from PDF Files outside the web browser" section >> Select "Change Settings" option >> In the "PDF Files may connect to web sites to share or get information" section >> Verify the radio button "Block PDF files access to all web sites" is selected and greyed out (locked). If "Custom setting" is checked, a documented risk acceptance approved by the ISSO/AO approving the websites must be provided, this is not a finding. Admin Template path: Computer Configuration >> Administrative Templates >> Adobe Reader DC Continuous >> Preferences >> Trust Manager >> "Access to websites" must be set to "Enabled" and "Block PDF files access to all web sites" selected in the drop down box. If "Custom setting" is selected, a documented risk acceptance approved by the ISSO/AO approving the websites must be provided, this is not a finding. This policy setting requires the installation of the AcrobatDCContinuous custom templates included with the STIG package. "AcrobatDCContinuous.admx" and "AcrobatDCContinuous.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

Fix text

Configure the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \Software\Policies\Adobe\Acrobat Reader\DC\FeatureLockDown\cDefaultLaunchURLPerms Value Name: iURLPerms Type: REG_DWORD Value: 1 If configuring system to allow access to websites, obtain documented ISSO approvals and risk acceptance and set “iURLPerms” to “0”. Configure the policy value for Computer Configuration > Administrative Templates > Adobe Reader DC Continuous > Preferences > Trust Manager > 'Access to websites' to 'Enabled' and select 'Block PDF files access to all web sites' in the drop down box. Select 'Custom setting' if needed and provide a documented risk acceptance approved by the ISSO/AO approving the websites. This policy setting requires the installation of the AcrobatDCContinuous custom templates included with the STIG package. "AcrobatDCContinuous.admx" and "AcrobatDCContinuous.adml" must be copied to the \Windows\PolicyDefinitions and \Windows\PolicyDefinitions\en-US directories respectively.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.

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