Ubuntu Security Notice USN-1640-1
26th November, 2012
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
linssh could be made to crash or run programs if it received specially crafted network traffic.
- libssh - A tiny C SSH library
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)
The problem can be corrected by updating your system to the following package version:
- 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
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.