USN-986-1: bzip2 vulnerability

20 September 2010

bzip2 vulnerability

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

  • Ubuntu 10.04 LTS
  • Ubuntu 9.10
  • Ubuntu 9.04
  • Ubuntu 8.04 LTS
  • Ubuntu 6.06 LTS


bzip2 could be made to run programs as your login if it opened a specially crafted file.

Software Description

  • bzip2 - high-quality block-sorting file compressor - utilities


An integer overflow was discovered in bzip2. If a user or automated system were tricked into decompressing a crafted bz2 file, an attacker could cause bzip2 or any application linked against libbz2 to crash or possibly execute code as the user running the program.

Update instructions

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

Ubuntu 10.04 LTS
bzip2 - 1.0.5-4ubuntu0.1
libbz2-1.0 - 1.0.5-4ubuntu0.1
Ubuntu 9.10
bzip2 - 1.0.5-3ubuntu0.1
libbz2-1.0 - 1.0.5-3ubuntu0.1
Ubuntu 9.04
bzip2 - 1.0.5-1ubuntu1.1
libbz2-1.0 - 1.0.5-1ubuntu1.1
Ubuntu 8.04 LTS
bzip2 - 1.0.4-2ubuntu4.1
libbz2-1.0 - 1.0.4-2ubuntu4.1
Ubuntu 6.06 LTS
bzip2 - 1.0.3-0ubuntu2.2
libbz2-1.0 - 1.0.3-0ubuntu2.2

To update your system, please follow these instructions:

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