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

File extensions must be enabled to match file types in Excel.

DISA Rule

SV-223332r508019_rule

Vulnerability Number

V-223332

Group Title

SRG-APP-000516

Rule Version

O365-EX-000023

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

Set policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Force file extension to match file type to "Always match file type".

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Force file extension to match file type is set to "Always match file type".

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

HKCU\software\policies\microsoft\office\16.0\excel\security

If value for extensionhardening is REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-223332

Documentable

False

Rule Version

O365-EX-000023

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Excel 2016 >> Excel Options >> Security >> Force file extension to match file type is set to "Always match file type".

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

HKCU\software\policies\microsoft\office\16.0\excel\security

If value for extensionhardening is REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Target Key

4099

Comments