USN-3117-1: GD library vulnerabilities

Ubuntu Security Notice USN-3117-1

1st 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 version:

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-xpm 2.0.36~rc1~dfsg-6ubuntu2.3

libgd2-noxpm 2.0.36~rc1~dfsg-6ubuntu2.3

To update your system, please follow these instructions: http://ift.tt/17VXqjU.

In general, a standard system update will make all the necessary changes.

References

CVE-2016-6911, CVE-2016-7568, CVE-2016-8670

from Ubuntu Security Notices http://ift.tt/2ewOFDB