Ubuntu Security Notice USN-2164-1
7th April, 2014
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.
- 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.
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: https://wiki.ubuntu.com/Security/Upgrades.
In general, a standard system update will make all the necessary changes.