USN-1541-1: libotr vulnerability

16 August 2012

libotr vulnerability

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS


Applications using Off-the-Record messaging plugins could be made to crash or run programs if it received specially crafted network messages.

Software Description

  • libotr - Off-the-Record Messaging library


Justin Ferguson discovered multiple heap overflows in libotr. A remote attacker could use this to craft a malformed OTR message that could cause a denial of service via application crash or possibly execute arbitrary code.

Update instructions

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

Ubuntu 12.04 LTS
libotr2 - 3.2.0-4ubuntu0.1
Ubuntu 11.10
libotr2 - 3.2.0-2.1ubuntu0.1
Ubuntu 11.04
libotr2 - 3.2.0-2ubuntu1.1
Ubuntu 10.04 LTS
libotr2 - 3.2.0-2ubuntu0.1

To update your system, please follow these instructions:

After a standard system update you need to restart any instant messaging applications using an Off-the-Record messaging plugin to make all the necessary changes.