USN-2484-1: Unbound vulnerability

26 January 2015

unbound vulnerability

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

  • Ubuntu 14.10
  • Ubuntu 14.04 LTS


Unbound could be made to consume resources if it received specially crafted network traffic.

Software Description

  • unbound - validating, recursive, caching DNS resolver


Florian Maury discovered that Unbound incorrectly handled delegation. A remote attacker could possibly use this issue to cause Unbound to consume resources, resulting in a denial of service.

Update instructions

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

Ubuntu 14.10
libunbound2 - 1.4.22-1ubuntu4.14.10.1
unbound - 1.4.22-1ubuntu4.14.10.1
Ubuntu 14.04 LTS
libunbound2 - 1.4.22-1ubuntu4.14.04.1
unbound - 1.4.22-1ubuntu4.14.04.1

To update your system, please follow these instructions:

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