USN-1629-1: libproxy vulnerabilities

12 November 2012

libproxy vulnerabilities

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 10.04 LTS


libproxy could be made to crash or run programs if it received specially crafted network traffic.

Software Description

  • libproxy - automatic proxy configuration management library


Tomas Mraz discovered that libproxy incorrectly handled certain PAC files. A remote attacker could use this issue to cause libproxy to crash, or to possibly execute arbitrary code. (CVE-2012-4504, CVE-2012-4505)

Update instructions

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

Ubuntu 12.04 LTS
libproxy1 - 0.4.7-0ubuntu4.1
Ubuntu 11.10
libproxy0 - 0.3.1-2ubuntu6.1
Ubuntu 10.04 LTS
libproxy0 - 0.3.1-1ubuntu1.1

To update your system, please follow these instructions:

After a standard system update you need to restart your session to make all the necessary changes.