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Session Initiation Protocol (SIP) security mode must be configured.


Finding ID Version Rule ID IA Controls Severity
V-70903 DTOO421 SV-85527r1_rule Medium
Skype for Business 2016 provides a single, unified client for real-time communications, including voice and video calls, Lync Meetings, presence, instant messaging, and persistent chat, using the Session Initiation Protocol (SIP). SIP is widely used for controlling multimedia communication sessions, such as voice and video calls over Internet Protocol (IP) networks. By using TLS it would render a sniff/man in the middle attack very difficult to impossible to achieve within the time period in which a given conversation could be attacked. TLS authenticates all parties and encrypts all traffic. This does not prevent listening over the wire, but the attacker cannot read the traffic unless the encryption is broken.
Microsoft Skype for Business 2016 STIG 2016-12-21


Check Text ( None )
Fix Text (F-45761r1_fix)
Set the policy value for Computer Configuration -> Administrative Templates -> Microsoft Skype for Business 2016 -> Microsoft Lync Feature Policies "Configure SIP security mode" to "Enabled".