Details

If an application is configured to require all add-ins to be signed by a trusted publisher, any unsigned add-ins the application loads will be disabled and the application will display the Trust Bar at the top of the active window. The Trust Bar contains a message informing users about the unsigned add-in. If a user is allowed to make the determination to allow an unsigned add-in, it increases the risk of malicious code being introduced onto the user’s computer or the network.

Solution

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Visio 2013 -> Visio Options -> Security -> Trust Center -> ‘Disable Trust Bar Notification for unsigned application add-ins and block them’ to ‘Enabled’.

Supportive Information

The following resource is also helpful.

• https://iasecontent.disa.mil/stigs/zip/U_MS_Visio_2013_V1R4_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Windows.

References

• 800-53|CM-5(3)
• CAT|II
• CCI|CCI-001749
• Rule-ID|SV-52796r1_rule
• STIG-ID|DTOO131
• Vuln-ID|V-40738

Source

• Tenable.com/audits