USN-2183-2: dpkg vulnerability

1 May 2014

dpkg vulnerability

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

  • Ubuntu 14.04 LTS
  • Ubuntu 13.10
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

A malicious source package could write files outside the unpack directory.

Software Description

  • dpkg - Debian package management system

Details

USN-2183-1 fixed a vulnerability in dpkg. Javier Serrano Polo discovered that the fix introduced a vulnerability in releases with an older version of the patch utility. This update fixes the problem.

Original advisory details:

Jakub Wilk discovered that dpkg incorrectly certain paths and symlinks when unpacking source packages. If a user or an automated system were tricked into unpacking a specially crafted source package, a remote attacker could modify files outside the target unpack directory, leading to a denial of service or potentially gaining access to the system.

Update instructions

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

Ubuntu 14.04 LTS
libdpkg-perl - 1.17.5ubuntu5.2
Ubuntu 13.10
libdpkg-perl - 1.16.12ubuntu1.2
Ubuntu 12.10
libdpkg-perl - 1.16.7ubuntu6.2
Ubuntu 12.04 LTS
libdpkg-perl - 1.16.1.2ubuntu7.4
Ubuntu 10.04 LTS
dpkg-dev - 1.15.5.6ubuntu4.8

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