USN-1456-1: Nut vulnerability

31 May 2012

nut vulnerability

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

  • Ubuntu 12.04 LTS
  • Ubuntu 11.10
  • Ubuntu 11.04
  • Ubuntu 10.04 LTS


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

Software Description

  • nut - Network UPS tools


Sebastian Pohle discovered that Nut did not properly validate its input when receiving data over the network. If upsd was configured to allow connections over the network, a remote attacker could exploit this to cause a denial of service (application crash).

Update instructions

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

Ubuntu 12.04 LTS
nut-server - 2.6.3-1ubuntu1.1
Ubuntu 11.10
nut-server - 2.6.1-2ubuntu2.1
Ubuntu 11.04
nut - 2.6.0-1ubuntu3.1
Ubuntu 10.04 LTS
nut - 2.4.3-1ubuntu3.2

To update your system, please follow these instructions:

In general, a standard system update will make all the necessary changes.