dbus regressions

4 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

Summary

DBus could be made to run programs as an administrator.

Software Description

• dbus - simple interprocess messaging system

Details

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 versions:

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: https://wiki.ubuntu.com/Security/Upgrades.

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

References

• USN-1576-1
• CVE-2012-3524