dhcp3, isc-dhcp vulnerabilities

15 August 2011

dhcp3, isc-dhcp vulnerabilities

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

• Ubuntu 11.04
• Ubuntu 10.10
• Ubuntu 10.04 LTS
• Ubuntu 8.04 LTS

Summary

An attacker could send crafted input to DHCP and cause it to crash.

Software Description

• isc-dhcp - DHCP server and client
• dhcp3 - DHCP server and client

Details

David Zych discovered that DHCP incorrectly handled certain malformed packets. A remote attacker could use this issue to cause DHCP to crash, resulting in a denial of service.

Update instructions

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

Ubuntu 11.04

isc-dhcp-server - 4.1.1-P1-15ubuntu9.1

Ubuntu 10.10

dhcp3-server - 3.1.3-2ubuntu6.3

Ubuntu 10.04 LTS

dhcp3-server - 3.1.3-2ubuntu3.3

Ubuntu 8.04 LTS

dhcp3-server - 3.0.6.dfsg-1ubuntu9.3

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.

References

• CVE-2011-2748
• CVE-2011-2749