USN-1889-1: HAProxy vulnerability

20 June 2013

haproxy vulnerability

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

  • Ubuntu 13.04
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS


HAProxy could be made to crash if it received specially crafted network traffic.

Software Description

  • haproxy - fast and reliable load balancing reverse proxy


David Torgerson discovered that HAProxy incorrectly parsed certain HTTP headers. A remote attacker could use this issue to cause HAProxy to stop responding, resulting in a denial of service.

Update instructions

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

Ubuntu 13.04
haproxy - 1.4.18-0ubuntu3.1
Ubuntu 12.10
haproxy - 1.4.18-0ubuntu2.2
Ubuntu 12.04 LTS
haproxy - 1.4.18-0ubuntu1.2

To update your system, please follow these instructions:

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