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The SIP security mode in Lync must be enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-223344 | O365-LY-000001 | SV-223344r508019_rule | Medium |
| Description |
|---|
| When Lync connects to the server, it supports various authentication mechanisms. This policy allows the user to specify whether Digest and Basic authentication are supported. Disabled (default): NTLM/Kerberos/TLS-DSK/Digest/Basic Enabled: Authentication mechanisms: NTLM/Kerberos/TLS-DSK Gal Download: Requires HTTPS if user is not logged in as an internal user. |
| STIG | Date |
|---|---|
| Microsoft Office 365 ProPlus Security Technical Implementation Guide | 2021-12-17 |
Details
| Check Text ( C-25017r442251_chk ) |
|---|
| Verify the policy value for Computer Configuration >> Administrative Templates >> Skype for Business 2016 >> Microsoft Lync Feature Policies "Configure SIP security mode" 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 enablesiphighsecuritymode is REG_DWORD = 1, this is not a finding. |
| Fix Text (F-25005r442252_fix) |
|---|
| Set the policy value for Computer Configuration >> Administrative Templates >> Skype for Business 2016 >> Microsoft Lync Feature Policies "Configure SIP security mode" to "Enabled". |