PyPAM could be made to crash or possibly run programs if it processed a specially crafted password.
Markus Vervier discovered that PyPAM incorrectly handled passwords containing NULL bytes. An attacker could exploit this to cause applications using PyPAM to crash, or possibly execute arbitrary code.
8 March 2012
A security issue affects these releases of Ubuntu and its derivatives:
PyPAM could be made to crash or possibly run programs if it processed a specially crafted password.
Markus Vervier discovered that PyPAM incorrectly handled passwords containing NULL bytes. An attacker could exploit this to cause applications using PyPAM to crash, or possibly execute arbitrary code.
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.
After a standard system update you need to restart applications that use PyPAM to make all the necessary changes.