USN-1044-1: D-Bus vulnerability

18 January 2011

dbus vulnerability

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

  • Ubuntu 10.10
  • Ubuntu 10.04 LTS
  • Ubuntu 9.10
  • Ubuntu 8.04 LTS


A local attacker could send crafted input to D-Bus and cause it to crash.

Software Description

  • dbus - simple interprocess messaging system


Remi Denis-Courmont discovered that D-Bus did not properly validate the number of nested variants when validating D-Bus messages. A local attacker could exploit this to cause a denial of service.

Update instructions

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

Ubuntu 10.10
libdbus-1-3 - 1.4.0-0ubuntu1.1
Ubuntu 10.04 LTS
libdbus-1-3 - 1.2.16-2ubuntu4.1
Ubuntu 9.10
libdbus-1-3 - 1.2.16-0ubuntu9.1
Ubuntu 8.04 LTS
libdbus-1-3 - 1.1.20-1ubuntu3.4

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.