USN-959-2: PAM vulnerability

25 October 2010

pam vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 10.10

Summary

Gain root by following symlinks.

Software Description

  • pam - Pluggable Authentication Modules

Details

USN-959-1 fixed vulnerabilities in PAM. This update provides the corresponding updates for Ubuntu 10.10.

Original advisory details:

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 10.10
libpam-modules - 1.1.1-4ubuntu2

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.

References