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

The HTTP fallback for SIP connection in Lync must be disabled.

DISA Rule

SV-223345r508019_rule

Vulnerability Number

V-223345

Group Title

SRG-APP-000219

Rule Version

O365-LY-000002

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 >> Skype for Business 2016 >> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" to "Enabled".

Check Contents

Verify the policy value for Computer Configuration >> Administrative Templates >> Skype for Business 2016 >> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" is set to "Enabled".

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

HKLM\Software\Policies\Microsoft\office\16.0\lync

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

Vulnerability Number

V-223345

Documentable

False

Rule Version

O365-LY-000002

Severity Override Guidance

Verify the policy value for Computer Configuration >> Administrative Templates >> Skype for Business 2016 >> Microsoft Lync Feature Policies "Disable HTTP fallback for SIP connection" is set to "Enabled".

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

HKLM\Software\Policies\Microsoft\office\16.0\lync

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

Check Content Reference

M

Target Key

4099

Comments