STIGQter: STIG Summary: Microsoft Lync 2013 STIG Version: 1 Release: 4 Benchmark Date: 27 Apr 2018:

In the event a secure Session Initiation Protocol (SIP) connection fails, the connection must be restricted from resorting to the unencrypted HTTP.

DISA Rule

SV-52836r2_rule

Vulnerability Number

V-40778

Group Title

DTOO422 - Session Initiation Protocol (SIP)

Rule Version

DTOO422

Severity

CAT II

CCI(s)

• CCI-001184 - The information system protects the authenticity of communications sessions.

Weight

10

Fix Recommendation

Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" to "Enabled".

Check Contents

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" is set to "Enabled".

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

HKLM\Software\Policies\Microsoft\office\15.0\lync

Criteria: If the value disablehttpconnect is REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-40778

Documentable

False

Rule Version

DTOO422

Severity Override Guidance

Verify the policy value for Computer Configuration -> Administrative Templates -> Microsoft Lync 2013 -> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" is set to "Enabled".

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

HKLM\Software\Policies\Microsoft\office\15.0\lync

Criteria: If the value disablehttpconnect is REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Responsibility

Information Assurance Officer

Target Key

2488

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