STIGQter: STIG Summary: Microsoft Office 365 ProPlus Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

Outlook must be configured to prevent users overriding attachment security settings.

DISA Rule

SV-223353r508019_rule

Vulnerability Number

V-223353

Group Title

SRG-APP-000340

Rule Version

O365-OU-000008

Severity

CAT II

CCI(s)

• CCI-002235 - The information system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.

Weight

10

Fix Recommendation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Prevent users from customizing attachment security settings to "Enabled".

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Prevent users from customizing attachment security settings is set to "Enabled".

Use the Windows Registry to navigate to the following key:

HKCU\software\policies\microsoft\office\16.0\outlook

If the value for disallowattachmentcustomization is set to REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-223353

Documentable

False

Rule Version

O365-OU-000008

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Prevent users from customizing attachment security settings is set to "Enabled".

Use the Windows Registry to navigate to the following key:

HKCU\software\policies\microsoft\office\16.0\outlook

If the value for disallowattachmentcustomization is set to REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Target Key

4099

Comments