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 allow retrieving of Certificate Revocation Lists (CRLs) always when online.

DISA Rule

SV-223358r508019_rule

Vulnerability Number

V-223358

Group Title

SRG-APP-000605

Rule Version

O365-OU-000013

Severity

CAT II

CCI(s)

• CCI-000185 - The information system, for PKI-based authentication, validates certifications by constructing and verifying a certification path to an accepted trust anchor including checking certificate status information.

Weight

10

Fix Recommendation

Set the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Cryptography >> Signature Status dialog box >> Retrieving CRLs (Certificate Revocation Lists) to "Enabled" "When online always retrieve the CRL".

Check Contents

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Cryptography >> Signature Status dialog box >> Retrieving CRLs (Certificate Revocation Lists) is set to "Enabled" "When online always retrieve the CRL".

Use the Windows Registry to navigate to the following key:

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

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

Vulnerability Number

V-223358

Documentable

False

Rule Version

O365-OU-000013

Severity Override Guidance

Verify the policy value for User Configuration >> Administrative Templates >> Microsoft Outlook 2016 >> Security >> Cryptography >> Signature Status dialog box >> Retrieving CRLs (Certificate Revocation Lists) is set to "Enabled" "When online always retrieve the CRL".

Use the Windows Registry to navigate to the following key:

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

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

Check Content Reference

M

Target Key

4099

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