USN-953-1: fastjar vulnerability

21 June 2010

fastjar 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


Software Description

  • fastjar


Dan Rosenberg discovered that fastjar incorrectly handled file paths containing “..” when unpacking archives. If a user or an automated system were tricked into unpacking a specially crafted jar file, arbitrary files could be overwritten with user privileges.

Update instructions

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

Ubuntu 10.04 LTS
fastjar - 2:0.98-1ubuntu0.10.04.1
Ubuntu 9.10
fastjar - 2:0.98-1ubuntu0.9.10.1
Ubuntu 9.04
fastjar - 2:0.97-3ubuntu0.1
Ubuntu 8.04 LTS
fastjar - 2:0.95-1ubuntu2.1

To update your system, please follow these instructions:

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