Ubuntu: 1640-1: libssh vulnerabilities
Posted by Benjamin D. Thomas   
Ubuntu linssh could be made to crash or run programs if it received speciallycrafted network traffic.
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Ubuntu Security Notice USN-1640-1
November 26, 2012

libssh vulnerabilities
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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:

linssh could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- libssh: A tiny C SSH library

Details:

Xi Wang and Florian Weimer discovered that libssh incorrectly handled
memory. A remote attacker could use this to cause libssh to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2012-4559, CVE-2012-4560, CVE-2012-4561, CVE-2012-4562)

Update instructions:

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

Ubuntu 12.10:
  libssh-4                        0.5.2-1ubuntu0.12.10.1

Ubuntu 12.04 LTS:
  libssh-4                        0.5.2-1ubuntu0.12.04.1

Ubuntu 11.10:
  libssh-4                        0.5.2-1ubuntu0.11.10.1

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

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

References:
  http://www.ubuntu.com/usn/usn-1640-1
  CVE-2012-4559, CVE-2012-4560, CVE-2012-4561, CVE-2012-4562

Package Information:
  https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.12.10.1
  https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.12.04.1
  https://launchpad.net/ubuntu/+source/libssh/0.5.2-1ubuntu0.11.10.1
  https://launchpad.net/ubuntu/+source/libssh/0.4.2-1ubuntu1.1