Ubuntu Security Notice 2164-1 - 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.
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Ubuntu Security Notice USN-2164-1
April 07, 2014
openssh vulnerability
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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