Title

Retrieving of CRL data must be set for online action. (Cat II impact)

Discussion

This policy setting controls how Outlook retrieves Certificate Revocation Lists to verify the validity of certificates. Certificate revocation lists (CRLs) are lists of digital certificates that have been revoked by their controlling certificate authorities (CAs), typically because the certificates were issued improperly or their associated private keys were compromised.

Check Content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography -> Signature Status dialog box "Retrieving CRLs (Certificate Revocation Lists)" is "Enabled (When online always retrieve the CRL)". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\security Criteria: If the value UseCRLChasing is REG_DWORD = 1, this is not a finding.

Fix Text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography -> Signature Status dialog box "Retrieving CRLs (Certificate Revocation Lists)" to "Enabled (When online always retrieve the CRL)".

Additional Identifiers

Rule ID: SV-54031r1_rule

Vulnerability ID: V-17778

Group Title: DTOO267 - Retrieving CRLs - Outlook

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.