A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 ESM
Several security issues were fixed in DHCP.
- isc-dhcp: DHCP server and client
USN-3586-1 fixed a vulnerability in DHCP. This update provides
the corresponding update for Ubuntu 12.04 ESM.
Original advisory details:
Felix Wilhelm discovered that the DHCP client incorrectly handled
certain malformed responses. A remote attacker could use this issue to
cause the DHCP client to crash, resulting in a denial of service, or
possibly execute arbitrary code. In the default installation,
attackers would be isolated by the dhclient AppArmor profile.
Felix Wilhelm discovered that the DHCP server incorrectly handled
reference counting. A remote attacker could possibly use this issue to
cause the DHCP server to crash, resulting in a denial of service.
The problem can be corrected by updating your system to the following