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

The MIME Sniffing safety feature must be enabled in all Office programs.

DISA Rule

SV-223301r508019_rule

Vulnerability Number

V-223301

Group Title

SRG-APP-000179

Rule Version

O365-CO-000019

Severity

CAT II

CCI(s)

• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.

Weight

10

Fix Recommendation

Set the policy value for Computer Configuration >> Administrative Templates >> Microsoft Office 2016 (Machine) >> Security Settings >> IE Security >> Mime Sniffing Safety Feature to "Enabled" for all installed Office programs.

Check Contents

Verify the policy value for Computer Configuration >> Administrative Templates >> Microsoft Office 2016 (Machine) >> Security Settings >> IE Security >> Mime Sniffing Safety Feature is set to "Enabled" and the check box is selected for every installed Office program.

Use the Windows Registry Editor to navigate to the following key:

HKLM\software\microsoft\internet explorer\main\featurecontrol\feature_mime_sniffing

If the value for all installed Office Programs is REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-223301

Documentable

False

Rule Version

O365-CO-000019

Severity Override Guidance

Verify the policy value for Computer Configuration >> Administrative Templates >> Microsoft Office 2016 (Machine) >> Security Settings >> IE Security >> Mime Sniffing Safety Feature is set to "Enabled" and the check box is selected for every installed Office program.

Use the Windows Registry Editor to navigate to the following key:

HKLM\software\microsoft\internet explorer\main\featurecontrol\feature_mime_sniffing

If the value for all installed Office Programs is REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Target Key

4099

Comments