USN-2478-1: libssh vulnerability

19 January 2015

libssh vulnerability

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

  • Ubuntu 14.10
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS


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

Software Description

  • libssh - A tiny C SSH library


It was discovered that libssh incorrectly handled certain kexinit packets. A remote attacker could possibly use this issue to cause libssh to crash, 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
libssh-4 - 0.6.3-2ubuntu1.1
Ubuntu 14.04 LTS
libssh-4 - 0.6.1-0ubuntu3.1
Ubuntu 12.04 LTS
libssh-4 - 0.5.2-1ubuntu0.12.04.4

To update your system, please follow these instructions:

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