USN-1519-1: DHCP vulnerabilities

Ubuntu Security Notice USN-1519-1

26th July, 2012

isc-dhcp vulnerabilities

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04

Summary

DHCP could be made to crash if it received specially crafted network traffic.

Software description

  • isc-dhcp - DHCP server and client

Details

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)

Update instructions

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.

References

CVE-2012-3571, CVE-2012-3954