USN-2364-1: Bash vulnerabilities

Ubuntu Security Notice USN-2364-1

27th 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 version:

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

CVE-2014-7186, CVE-2014-7187