Skype for Business Remote Code Execution Vulnerability

What privileges could be gained by an attacker who successfully exploited the vulnerability? An attacker who successfully exploited this vulnerability could execute code in the security context of the “NT AUTHORITY\Network Service” account.

According to the CVSS metric, privileges required is high (PR:H). What does that mean for this vulnerability? Successful exploitation of this vulnerability requires the attacker or targeted user to be granted an administrative role in the Skype for Business Control Panel. To help retain security and role-based access control integrity, add users to the groups that define what role the user performs in management of the Skype for Business Server deployment.

How could an attacker exploit this vulnerability? An attacker could exploit this vulnerability by leveraging the OcsPowershell endpoint within Skype for Business 2019 and elevate their privileges to execute code as NT Authority\Network Service user. Exploitation of this vulnerability requires the authenticated remote user be granted either the CsVoiceAdministrator or CsServerAdministrator role.