USN-2164-1: OpenSSH vulnerability

Ubuntu Security Notice USN-2164-1

7th April, 2014

openssh vulnerability

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

  • Ubuntu 13.10
  • Ubuntu 12.10
  • Ubuntu 12.04 LTS


A malicious server could bypass OpenSSH SSHFP DNS record checking.

Software description

  • openssh - secure shell (SSH) for secure access to remote machines


Matthew Vernon discovered that OpenSSH did not correctly check SSHFP DNS
records if a server presented an unacceptable host certificate. A malicious
server could use this issue to disable SSHFP checking.

Update instructions

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

Ubuntu 13.10:
openssh-client 1:6.2p2-6ubuntu0.3
Ubuntu 12.10:
openssh-client 1:6.0p1-3ubuntu1.2
Ubuntu 12.04 LTS:
openssh-client 1:5.9p1-5ubuntu1.3

To update your system, please follow these instructions:

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