Ubuntu Security Notice USN-531-2
23rd 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
Details
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 version:
- 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: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system upgrade is sufficient to effect the
necessary changes.