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USN-1108-1: DHCP vulnerability

11 April 2011

An attacker's DHCP server could send crafted responses to your computer and cause it to run programs as root.




Sebastian Krahmer discovered that the dhclient utility incorrectly filtered
crafted responses. An attacker could use this flaw with a malicious DHCP
server to execute arbitrary code, resulting in root privilege escalation.

Update instructions

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

Ubuntu 9.10
Ubuntu 8.04
Ubuntu 6.06
Ubuntu 10.10
Ubuntu 10.04

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


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