Adobe Acrobat Pro DC PDF file attachments must be blocked.

From Adobe Acrobat Pro DC Security Technical Implementation Guide

Part of SRG-APP-000141

Associated with: CCI-000381

SV-94069r1_rule Adobe Acrobat Pro DC PDF file attachments must be blocked.

Vulnerability discussion

Acrobat Pro allows for files to be attached to PDF documents. Attachments represent a potential security risk because they can contain malicious content, open other dangerous files, or launch applications.This feature prevents users from opening or launching file types other than PDF or FDF and disables the menu option to re-enable.

Check content

Verify the following registry configuration: Utilizing the Registry Editor, navigate to the following: HKEY_LOCAL_MACHINE\Software\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown Value Name: iFileAttachmentPerms Type: REG_DWORD Value: 1 If the value for iFileAttachmentPerms 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 > Trust Manager > In the 'PDF File Attachments' section > Verify 'Allow opening of non-PDF file attachments with external applications' checkbox is unchecked and greyed out (locked). If the box is checked and not greyed out (locked), this is a finding. Admin Template path: Computer Configuration > Administrative Templates > Adobe Acrobat Pro DC > Preferences > Trust Manager > 'Allow opening of non-PDF file attachments with external applications' must be set to 'Disabled'. This policy setting requires the installation of the AcrobatProDC custom templates included with the STIG package. "AcrobatProDC.admx" and "AcrobatProDC.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\Adobe Acrobat\DC\FeatureLockDown Value Name: iFileAttachmentPerms Type: REG_DWORD Value: 1 Configure the policy value for Computer Configuration > Administrative Templates > Adobe Acrobat Pro DC > Preferences > Trust Manager > 'Allow opening of non-PDF file attachments with external applications' to 'Disabled'. This policy setting requires the installation of the AcrobatProDC custom templates included with the STIG package. "AcrobatProDC.admx" and "AcrobatProDC.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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