STIGQter: STIG Summary: Microsoft Outlook 2013 STIG Version: 1 Release: 13 Benchmark Date: 26 Oct 2018:

Warning about invalid signatures must be enforced.

DISA Rule

SV-54024r1_rule

Vulnerability Number

V-17803

Group Title

DTOO265 - Signature Warnings

Rule Version

DTOO265

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 2013 -> Security -> Cryptography "Signature Warning" to "Enabled (Always warn about invalid signatures)".

Check Contents

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography "Signature Warning" is "Enabled (Always warn about invalid signatures)".

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 WarnAboutInvalid is REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-17803

Documentable

False

Rule Version

DTOO265

Severity Override Guidance

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Security -> Cryptography "Signature Warning" is "Enabled (Always warn about invalid signatures)".

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 WarnAboutInvalid is REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Responsibility

Information Assurance Officer

Target Key

2482

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