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Ubuntu Security Notice USN-3213-1
February 28, 2017

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:

Stefan Esser discovered that the GD library incorrectly handled memory when
processing certain 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. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-10166)

It was discovered that the GD library incorrectly handled certain malformed
images. If a user or automated system were tricked into processing a
specially crafted image, an attacker could cause a denial of service.
(CVE-2016-10167)

It was discovered that the GD library incorrectly handled certain malformed
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-2016-10168)

Ibrahim El-Sayed discovered that the GD library incorrectly handled certain
malformed TGA images. If a user or automated system were tricked into
processing a specially crafted TGA image, an attacker could cause a denial
of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and
Ubuntu 16.10. (CVE-2016-6906)

Ibrahim El-Sayed discovered that the GD library incorrectly handled certain
malformed 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 affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-6912)

It was discovered that the GD library incorrectly handled creating
oversized images. If a user or automated system were tricked into creating
a specially crafted image, an attacker could cause a denial of service.
(CVE-2016-9317)

It was discovered that the GD library incorrectly handled filling certain
images. If a user or automated system were tricked into filling an image,
an attacker could cause a denial of service. (CVE-2016-9933)

Update instructions:

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

Ubuntu 16.10:
  libgd3                          2.2.1-1ubuntu3.3

Ubuntu 16.04 LTS:
  libgd3                          2.1.1-4ubuntu0.16.04.6

Ubuntu 14.04 LTS:
  libgd3                          2.1.0-3ubuntu0.6

Ubuntu 12.04 LTS:
  libgd2-noxpm                    2.0.36~rc1~dfsg-6ubuntu2.4
  libgd2-xpm                      2.0.36~rc1~dfsg-6ubuntu2.4

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

References:
  http://www.ubuntu.com/usn/usn-3213-1
  CVE-2016-10166, CVE-2016-10167, CVE-2016-10168, CVE-2016-6906,
  CVE-2016-6912, CVE-2016-9317, CVE-2016-9933

Package Information:
  https://launchpad.net/ubuntu/+source/libgd2/2.2.1-1ubuntu3.3
  https://launchpad.net/ubuntu/+source/libgd2/2.1.1-4ubuntu0.16.04.6
  https://launchpad.net/ubuntu/+source/libgd2/2.1.0-3ubuntu0.6
  https://launchpad.net/ubuntu/+source/libgd2/2.0.36~rc1~dfsg-6ubuntu2.4