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XCCDF
Microsoft Skype for Business 2016 Security Technical Implementation Guide
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An XCCDF Profile
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3 rules organized in 3 groups
SRG-APP-000219
1 Rule
Session Initiation Protocol (SIP) security mode must be configured.
Medium Severity
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.
SRG-APP-000219
1 Rule
In the event a secure Session Initiation Protocol (SIP) connection fails, the connection must be restricted from resorting to the unencrypted HTTP.
Medium Severity
Prevents from HTTP being used for SIP connection in case TLS or TCP fail.
SRG-APP-000516
1 Rule
The ability to store user passwords in Skype must be disabled.
Medium Severity
Allows Microsoft Lync to store user passwords. If you enable this policy setting, Microsoft Lync can store a password on request from the user. If you disable this policy setting, Microsoft Lync cannot store a password. If you do not configure this policy setting and the user logs on to a domain, Microsoft Lync does not store the password. If you do not configure this policy setting and the user does not log on to a domain (for example, if the user logs on to a workgroup), Microsoft Lync can store the password. Note: You can configure this policy setting under both Computer Configuration and User Configuration, but the policy setting under Computer Configuration takes precedence.