=========================================================================Ubuntu Security Notice USN-1707-1
January 28, 2013

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS
- Ubuntu 11.10
- Ubuntu 10.04 LTS

Summary:

libssh could be made to crash if it received specially crafted network
traffic.

Software Description:
- libssh: A tiny C SSH library

Details:

Yong Chuan Koh discovered that libssh incorrectly handled certain
negotiation requests. A remote attacker could use this to cause libssh to
crash, resulting in a denial of service.

Update instructions:

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

Ubuntu 12.10:
  libssh-4                        0.5.2-1ubuntu0.12.10.2

Ubuntu 12.04 LTS:
  libssh-4                        0.5.2-1ubuntu0.12.04.2

Ubuntu 11.10:
  libssh-4                        0.5.2-1ubuntu0.11.10.2

Ubuntu 10.04 LTS:
  libssh-4                        0.4.2-1ubuntu1.2

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

References:
  https://ubuntu.com/security/notices/USN-1707-1
  CVE-2013-0176

Package Information:
  https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.12.10.2
  https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.12.04.2
  https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.11.10.2
  https://launchpad.net/ubuntu/+source/libssh/0.4.2-1ubuntu1.2