USN-3117-1: GD library vulnerabilities

1 November 2016

libgd2 vulnerabilities

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

The GD library could be made to crash or run programs if it processed a specially crafted image file.

Software Description

  • libgd2 - GD Graphics Library

Details

Ibrahim El-Sayed discovered that the GD library incorrectly handled certain malformed Tiff images. If a user or automated system were tricked into processing a specially crafted Tiff image, an attacker could cause a denial of service. (CVE-2016-6911)

Ke Liu discovered that the GD library incorrectly handled certain integers when processing WebP images. If a user or automated system were tricked into processing a specially crafted WebP image, an attacker could cause a denial of service, or possibly execute arbitrary code. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7568)

Emmanuel Law discovered that the GD library incorrectly handled certain strings when creating images. If a user or automated system were tricked into processing a specially crafted image, an attacker could cause a denial of service, or possibly execute arbitrary code. (CVE-2016-8670)

Update instructions

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

Ubuntu 16.10
libgd3 - 2.2.1-1ubuntu3.2
Ubuntu 16.04 LTS
libgd3 - 2.1.1-4ubuntu0.16.04.5
Ubuntu 14.04 LTS
libgd3 - 2.1.0-3ubuntu0.5
Ubuntu 12.04 LTS
libgd2-noxpm - 2.0.36~rc1~dfsg-6ubuntu2.3
libgd2-xpm - 2.0.36~rc1~dfsg-6ubuntu2.3

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