Ubuntu Security Notice 1576-2 - 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. 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. Various other issues were also addressed.
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Ubuntu Security Notice USN-1576-2
October 04, 2012
dbus regressions
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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
In general, a standard system update will make all the necessary changes.
References:
http://www.ubuntu.com/usn/usn-1576-2
http://www.ubuntu.com/usn/usn-1576-1
CVE-2012-3524
Package Information:
https://launchpad.net/ubuntu/+source/dbus/1.4.18-1ubuntu1.3
https://launchpad.net/ubuntu/+source/dbus/1.4.14-1ubuntu1.3
https://launchpad.net/ubuntu/+source/dbus/1.4.6-1ubuntu6.4
https://launchpad.net/ubuntu/+source/dbus/1.2.16-2ubuntu4.7
https://launchpad.net/ubuntu/+source/dbus/1.1.20-1ubuntu3.9