USN-531-2: dhcp vulnerability

23 October 2007

dhcp vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 7.10
  • Ubuntu 7.04
  • Ubuntu 6.10
  • Ubuntu 6.06 LTS

Software Description

  • dhcp


USN-531-1 fixed vulnerabilities in dhcp. The fixes were incomplete, and only reduced the scope of the vulnerability, without fully solving it. This update fixes the problem.

Original advisory details:

Nahuel Riva and Gerardo Richarte discovered that the DHCP server did not correctly handle certain client options. A remote attacker could send malicious DHCP replies to the server and execute arbitrary code.

Update instructions

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

Ubuntu 7.10
dhcp - 2.0pl5dfsg1-20ubuntu1.2
Ubuntu 7.04
dhcp - 2.0pl5-19.5ubuntu2.2
Ubuntu 6.10
dhcp - 2.0pl5-19.4ubuntu1.2
Ubuntu 6.06 LTS
dhcp - 2.0pl5-19.4ubuntu0.2

To update your system, please follow these instructions:

In general, a standard system upgrade is sufficient to effect the necessary changes.