USN-2145-1: libssh vulnerability

12 March 2014

libssh vulnerability

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

  • Ubuntu 13.10
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS


A security issue was fixed in libssh.

Software Description

  • libssh - A tiny C SSH library


Aris Adamantiadis discovered that libssh allowed the OpenSSL PRNG state to be reused when implementing forking servers. This could allow an attacker to possibly obtain information about the state of the PRNG and perform cryptographic attacks.

Update instructions

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

Ubuntu 13.10
libssh-4 - 0.5.4-1ubuntu0.1
Ubuntu 12.10
libssh-4 - 0.5.2-1ubuntu0.12.10.3
Ubuntu 12.04 LTS
libssh-4 - 0.5.2-1ubuntu0.12.04.3

To update your system, please follow these instructions:

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