Ubuntu Security Notice USN-1519-1
26th July, 2012
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
- 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
Markus Hietava discovered that the DHCP server incorrectly handled certain
malformed client identifiers. A remote attacker could use this issue to
cause DHCP to crash, resulting in a denial of service. (CVE-2012-3571)
Glen Eustace discovered that the DHCP server incorrectly handled memory. A
remote attacker could use this issue to cause DHCP to crash, resulting in a
denial of service. (CVE-2012-3954)
The problem can be corrected by updating your system to the following package version:
- Ubuntu 12.04 LTS:
- isc-dhcp-server 4.1.ESV-R4-0ubuntu5.2
- Ubuntu 11.10:
- isc-dhcp-server 4.1.1-P1-17ubuntu10.3
- Ubuntu 11.04:
- isc-dhcp-server 4.1.1-P1-15ubuntu9.4
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.