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Ubuntu Security Notice USN-2164-1
April 07, 2014

openssh vulnerability

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

• Ubuntu 13.10
• Ubuntu 12.10
• Ubuntu 12.04 LTS

Summary:

A malicious server could bypass OpenSSH SSHFP DNS record checking.

Software Description:

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

Details:

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 versions:

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

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

References:
http://www.ubuntu.com/usn/usn-2164-1
CVE-2014-2653

Package Information:
https://launchpad.net/ubuntu/+source/openssh/1:6.2p2-6ubuntu0.3
https://launchpad.net/ubuntu/+source/openssh/1:6.0p1-3ubuntu1.2
https://launchpad.net/ubuntu/+source/openssh/1:5.9p1-5ubuntu1.3

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