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Cisco VPN Client for Unix Local Buffer Overflow Vulnerability

The Cisco VPN Client software is used to establish Virtual Private Network (VPN) connections between client machines and a Cisco VPN Concentrator.

A vulnerability has been reported in some versions of the VPN Client. If an oversized profile name is passed to the vpnclient binary, a buffer overflow condition may occur. As vpnclient runs suid root, exploitation of this vulnerability will grant a local attacker root access to the vulnerable system.

This vulnerability affects the VPN Client version 3.5.1 for Linux, Solaris and Mac OS X. Windows clients are not believed to be vulnerable. Earlier versions of the VPN Client may share this vulnerability, although this has not been confirmed.