USN-2593-1: Dnsmasq vulnerability

4 May 2015

dnsmasq vulnerability

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

  • Ubuntu 15.04
  • Ubuntu 14.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


Dnsmasq could be made to crash or expose sensitive information if it received specially crafted network traffic.

Software Description

  • dnsmasq - Small caching DNS proxy and DHCP/TFTP server


Nick Sampanis discovered that Dnsmasq incorrectly handled certain malformed DNS requests. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service, or possibly obtain sensitive information.

Update instructions

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

Ubuntu 15.04
dnsmasq-base - 2.72-3ubuntu0.1
Ubuntu 14.10
dnsmasq-base - 2.71-1ubuntu0.1
Ubuntu 14.04 LTS
dnsmasq-base - 2.68-1ubuntu0.1
Ubuntu 12.04 LTS
dnsmasq - 2.59-4ubuntu0.2
dnsmasq-base - 2.59-4ubuntu0.2
dnsmasq-utils - 2.59-4ubuntu0.2

To update your system, please follow these instructions:

After a standard system update you need to reboot your computer to make all the necessary changes.