USN-986-1: bzip2 vulnerability

Ubuntu Security Notice USN-986-1

20th 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 version:

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.