The GD library could be made to crash or run programs if it processed a specially crafted image file.
It was discovered that the GD library incorrectly handled certain color tables in XPM images. If a user or automated system were tricked into processing a specially crafted XPM image, an attacker could cause a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-2497)
31 May 2016
A security issue affects these releases of Ubuntu and its derivatives:
The GD library could be made to crash or run programs if it processed a specially crafted image file.
It was discovered that the GD library incorrectly handled certain color tables in XPM images. If a user or automated system were tricked into processing a specially crafted XPM image, an attacker could cause a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-2497)
It was discovered that the GD library incorrectly handled certain malformed GIF images. If a user or automated system were tricked into processing a specially crafted GIF image, an attacker could cause a denial of service. This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-9709)
It was discovered that the GD library incorrectly handled memory when using gdImageFillToBorder(). A remote attacker could possibly use this issue to cause a denial of service. (CVE-2015-8874)
It was discovered that the GD library incorrectly handled memory when using gdImageScaleTwoPass(). A remote attacker could possibly use this issue to cause a denial of service. This issue only applied to Ubuntu 14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04 LTS. (CVE-2015-8877)
Hans Jerry Illikainen discovered that the GD library incorrectly handled certain malformed GD images. If a user or automated system were tricked into processing a specially crafted GD image, an attacker could cause a denial of service or possibly execute arbitrary code. (CVE-2016-3074)
The problem can be corrected by updating your system to the following package versions:
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.