OpenSSH could be made to run programs if it received specially crafted network traffic from an authenticated user.
Markus Friedl discovered that OpenSSH incorrectly handled memory when the AES-GCM cipher was used. A remote authenticated attacker could use this issue to execute arbitrary code as their user, possibly bypassing shell or command restrictions.
8 November 2013
A security issue affects these releases of Ubuntu and its derivatives:
OpenSSH could be made to run programs if it received specially crafted network traffic from an authenticated user.
Markus Friedl discovered that OpenSSH incorrectly handled memory when the AES-GCM cipher was used. A remote authenticated attacker could use this issue to execute arbitrary code as their user, possibly bypassing shell or command restrictions.
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.
Vulmon