CVE-2016-1287
Cisco Adaptive Security Appliance (ASA) Internet Key Exchange versions 1 and 2 (IKEv1 and IKEv2) contains a buffer overflow vulnerability that may be leveraged to gain remote code execution.
According to the advisory by Exodus Intelligence:
The algorithm for re-assembling IKE payloads fragmented with the Cisco fragmentation protocol contains a bounds-checking flaw that allows a heap buffer to be overflowed with attacker-controlled data. A sequence of payloads with carefully chosen parameters causes a buffer of insufficient size to be allocated in the heap which is then overflowed when fragment payloads are copied into the buffer. Attackers can use this vulnerability to execute arbitrary code on affected devices.
Systems that are configured to terminate IKEv1 and IKEv2 VPN connections are vulnerable to exploitation. The Cisco security advisory describes how to determine if a system is configured in a vulnerable manner by checking the running crypto maps.
Cisco has issued updates for several versions of ASA to address this vulnerability. Users are encouraged to update to the latest version.
