USN-1576-2: DBus regressions

Ubuntu Security Notice USN-1576-2

4th October, 2012

dbus regressions

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
  • Ubuntu 8.04 LTS


DBus could be made to run programs as an administrator.

Software description

  • dbus - simple interprocess messaging system


USN-1576-1 fixed vulnerabilities in DBus. The update caused a regression
for certain services launched from the activation helper, and caused an
unclean shutdown on upgrade. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Sebastian Krahmer discovered that DBus incorrectly handled environment
variables when running with elevated privileges. A local attacker could
possibly exploit this flaw with a setuid binary and gain root privileges.

Update instructions

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

Ubuntu 12.04 LTS:
dbus 1.4.18-1ubuntu1.3
libdbus-1-3 1.4.18-1ubuntu1.3
Ubuntu 11.10:
dbus 1.4.14-1ubuntu1.3
libdbus-1-3 1.4.14-1ubuntu1.3
Ubuntu 11.04:
dbus 1.4.6-1ubuntu6.4
libdbus-1-3 1.4.6-1ubuntu6.4
Ubuntu 10.04 LTS:
dbus 1.2.16-2ubuntu4.7
libdbus-1-3 1.2.16-2ubuntu4.7
Ubuntu 8.04 LTS:
dbus 1.1.20-1ubuntu3.9
libdbus-1-3 1.1.20-1ubuntu3.9

To update your system, please follow these instructions:

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