Symantec ProxyClient 3.4 for Windows is susceptible to a privilege escalation vulnerability. A malicious local Windows user can, under certain circumstances, exploit this vulnerability to escalate their privileges on the system and execute arbitrary code with LocalSystem privileges.

Blue Coat ProxyClient before 3.3.3.3 and 3.4.x before 3.4.4.10 and Unified Agent before 4.1.3.151952 does not properly validate certain certificates, which allows man-in-the-middle attackers to spoof ProxySG Client Managers, and consequently modify configurations and execute arbitrary software updates, via a crafted certificate.