USN-3389-2: GD vulnerability
Ubuntu Security Notice USN-3389-2
14th August, 2017
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
The system could be made to expose sensitive information.
- libgd2 - GD Graphics Library
USN-3389-1 fixed a vulnerability in GD Graphics Library.
This update provides the corresponding update for Ubuntu 12.04 ESM.
Original advisory details:
A vulnerability was discovered in GD Graphics Library (aka libgd),
as used in PHP that does not zero colorMap arrays before use.
A specially crafted GIF image could use the uninitialized tables to
read bytes from the top of the stack.
The problem can be corrected by updating your system to the following package version:
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.