Detections
Analytics

O365-AC-000003 - VBA Macros not digitally signed must be blocked in Access.

Information

This policy setting controls how the specified applications warn users when Visual Basic for Applications (VBA) macros are present.

If this policy setting is enabled, choose from four options for determining how the specified applications will warn the user about macros:

- Disable all with notification: The application displays the Trust Bar for all macros, whether signed or unsigned. This option enforces the default configuration in Office. This option also allows users to potentially enable unsigned/untrusted macros. If a site requires the use of macros, they must be signed/approved and added to appropriate locations listed in the Trust Center Settings.
- Disable all except digitally signed macros: The application displays the Trust Bar for digitally signed macros, allowing users to enable them or leave them disabled. Any unsigned macros are disabled, and users are not notified.
- Disable all without notification: The application disables all macros, whether signed or unsigned, and does not notify users.
- Enable all macros (not recommended): All macros are enabled, whether signed or unsigned. This option can significantly reduce security by allowing dangerous code to run undetected.

If this policy setting is disabled, 'Disable all with notification' will be the default setting.

If this policy setting is not configured, when users open files in the specified applications that contain VBA macros, the applications open the files with the macros disabled and display the Trust Bar with a warning that macros are present and have been disabled. Users can inspect and edit the files if appropriate, but cannot use any disabled functionality until they enable it by clicking 'Enable Content' on the Trust Bar. If the user clicks 'Enable Content', then the document is added as a trusted document.

Important: If 'Disable all except digitally signed macros' is selected, users will not be able to open unsigned Access databases.

Solution

Set User Configuration >> Administrative Templates >> Microsoft Access 2016 >> Application Settings >> Security >> Trust Center >> VBA Macro Notification Settings to 'Disable all except digitally signed macros'.

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_MS_Office_365_ProPlus_V2R11_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7a., CAT|II, CCI|CCI-000381, Rule-ID|SV-223282r928373_rule, STIG-ID|O365-AC-000003, STIG-Legacy|SV-108741, STIG-Legacy|V-99637, Vuln-ID|V-223282

Plugin: Windows

Control ID: ab0ecc552f3e55c6d859fc24f6e928d04681f3b949792eddd495c7df174ace08