USN-2380-1: Bash vulnerabilities

9 October 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

Michal Zalewski discovered that Bash incorrectly handled parsing certain function definitions. If an attacker were able to create an environment variable containing a function definition with a very specific name, these issues could possibly be used to bypass certain environment restrictions and execute arbitrary code. (CVE-2014-6277, CVE-2014-6278)

Please note that the previous Bash security update, USN-2364-1, includes a hardening measure that prevents these issues from being used in a Shellshock attack.

Update instructions

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

Ubuntu 14.04 LTS
bash - 4.3-7ubuntu1.5
Ubuntu 12.04 LTS
bash - 4.2-2ubuntu2.6
Ubuntu 10.04 LTS
bash - 4.1-2ubuntu3.5

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