Ubuntu Security Notice USN-1107-1
6th April, 2011
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
An attacker could send crafted input to xrdb and cause it to run programs as root.
- x11-xserver-utils - X server utilities
Sebastian Krahmer discovered that the xrdb utility incorrectly filtered
crafted hostnames. An attacker could use this flaw with a malicious
DHCP server or with a remote xdmcp login and execute arbitrary code,
resulting in root privilege escalation.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 10.10:
- x11-xserver-utils 7.5+2ubuntu1.1
- Ubuntu 10.04 LTS:
- x11-xserver-utils 7.5+1ubuntu2.1
- Ubuntu 9.10:
- x11-xserver-utils 7.4+2ubuntu3.1
- Ubuntu 8.04 LTS:
- x11-xserver-utils 7.3+2ubuntu0.1
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make
all the necessary changes.