USN-959-1: PAM vulnerability

07 July 2010

Root privilege escalation via symlink following.



  • pam - Pluggable Authentication Modules library


Denis Excoffier discovered that the PAM MOTD module in Ubuntu did
not correctly handle path permissions when creating user file stamps.
A local attacker could exploit this to gain root privilieges.

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 9.10
Ubuntu 10.04

In general, a standard system update will make all the necessary changes.


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