Microsoft Skype for Business and Lync Server CVE-2015-6061 Security Bypass Vulnerability

Description

Microsoft Skype for Business and Lync Server are prone to a security-bypass vulnerability. An attacker can leverage this issue to bypass certain security restrictions and perform unauthorized actions.

Technologies Affected

• Microsoft Lync 2010 (32-bit)
• Microsoft Lync 2010 (64-bit)
• Microsoft Lync 2010 Attendee
• Microsoft Lync 2013 (32-bit) SP1
• Microsoft Lync 2013 (64-bit) SP1
• Microsoft Lync Basic 2013 (32-bit) SP1
• Microsoft Lync Basic 2013 (64-bit) SP1
• Microsoft Lync Room System
• Microsoft Skype for Business 2016 (32-bit)
• Microsoft Skype for Business 2016 (64-bit)
• Microsoft Skype for Business Basic 2016 (32-bit)
• Microsoft Skype for Business Basic 2016 (64-bit)

Recommendations

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity. This may indicate exploit attempts or activity that results from a successful exploit.

Run all software as a nonprivileged user with minimal access rights.
Ensure that all nonadministrative tasks, such as browsing the web and reading email, are performed as an unprivileged user with minimal access rights.

Updates are available. Please see the references or vendor advisory for more information.