Ubuntu Security Notice USN-1309-1
15th December, 2011
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 11.10
- Ubuntu 11.04
DHCP could be made to crash if it received specially crafted network traffic.
- isc-dhcp - DHCP server and client
It was discovered that the DHCP server incorrectly handled certain
malformed packets when configured to evaluate regular expressions. A remote
attacker could use this issue to cause DHCP to crash, resulting in a denial
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- isc-dhcp-server 4.1.1-P1-17ubuntu10.1
- Ubuntu 11.04:
- isc-dhcp-server 4.1.1-P1-15ubuntu9.3
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.