USN-2364-1: Bash vulnerabilities

27 September 2014

bash vulnerabilities

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

  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS
  • Ubuntu 10.04 LTS

Summary

Several security issues were fixed in Bash.

Software Description

  • bash - GNU Bourne Again SHell

Details

Florian Weimer and Todd Sabin discovered that the Bash parser incorrectly handled memory. An attacker could possibly use this issue to bypass certain environment restrictions and execute arbitrary code. (CVE-2014-7186, CVE-2014-7187)

In addition, this update introduces a hardening measure which adds prefixes and suffixes around environment variable names which contain shell functions.

Update instructions

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

Ubuntu 14.04 LTS
bash - 4.3-7ubuntu1.4
Ubuntu 12.04 LTS
bash - 4.2-2ubuntu2.5
Ubuntu 10.04 LTS
bash - 4.1-2ubuntu3.4

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.

References