USN-4058-2: Bash vulnerability

5 August 2019

bash vulnerability

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM

Summary

A system hardening measure could be bypassed.

Software Description

  • bash - GNU Bourne Again SHell

Details

USN-4058-1 fixed a vulnerability in bash. This update provides the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that Bash incorrectly handled the restricted shell. An attacker could possibly use this issue to escape restrictions and execute any command.

Update instructions

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

Ubuntu 14.04 ESM
bash - 4.3-7ubuntu1.8+esm1
Ubuntu 12.04 ESM
bash - 4.2-2ubuntu2.8

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