USN-1038-1: dpkg vulnerability

Ubuntu Security Notice USN-1038-1

6th January, 2011

dpkg vulnerability

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10


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

Software description

  • dpkg - Debian package management system


Jakub Wilk and Raphael Hertzog discovered that dpkg-source did not
correctly handle certain paths and symlinks when unpacking source-format
version 3.0 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 version:

Ubuntu 10.10:
Ubuntu 10.04 LTS:
Ubuntu 9.10:
dpkg-dev 1.15.4ubuntu2.3

To update your system, please follow these instructions:

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