Ubuntu 12.10 USN-1640-1 Critical: libssh Remote Code Execution

ubuntu

November 26, 2012

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

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)

Topics Covered

security advisory denial of service critical remote code execution ubuntu network exploit libssh

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.