USN-1456-1: Nut vulnerability

Ubuntu Security Notice USN-1456-1

31st 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 version:

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.