============================================================================
Ubuntu Security Notice USN-3030-1
July 11, 2016

libgd2 vulnerabilities
============================================================================

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

- Ubuntu 16.04 LTS
- Ubuntu 15.10
- 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:

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 affected Ubuntu 14.04 LTS.
(CVE-2013-7456)

It was discovered that the GD library incorrectly handled certain malformed
XBM images. If a user or automated system were tricked into processing a
specially crafted XBM image, an attacker could cause a denial of service.
This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.10 and Ubuntu 16.04
LTS. (CVE-2016-5116)

It was discovered that the GD library incorrectly handled memory when using
_gd2GetHeader(). A remote attacker could possibly use this issue to cause a
denial of service or possibly execute arbitrary code. (CVE-2016-5766)

It was discovered that the GD library incorrectly handled certain color
indexes. A remote attacker could possibly use this issue to cause a denial
of service. This issue only affected Ubuntu 14.04 LTS, Ubuntu 15.10 and
Ubuntu 16.04 LTS. (CVE-2016-6128)

It was discovered that the GD library incorrectly handled memory when
encoding a GIF image. A remote attacker could possibly use this issue to
cause a denial of service. (CVE-2016-6161)

Update instructions:

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

Ubuntu 16.04 LTS:
  libgd3                          2.1.1-4ubuntu0.16.04.2

Ubuntu 15.10:
  libgd3                          2.1.1-4ubuntu0.15.10.2

Ubuntu 14.04 LTS:
  libgd3                          2.1.0-3ubuntu0.2

Ubuntu 12.04 LTS:
  libgd2-noxpm                    2.0.36~rc1~dfsg-6ubuntu2.2
  libgd2-xpm                      2.0.36~rc1~dfsg-6ubuntu2.2

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

References:
  http://www.ubuntu.com/usn/usn-3030-1
  CVE-2013-7456, CVE-2016-5116, CVE-2016-5766, CVE-2016-6128,
  CVE-2016-6161

Package Information:
  https://launchpad.net/ubuntu/+source/libgd2/2.1.1-4ubuntu0.16.04.2
  https://launchpad.net/ubuntu/+source/libgd2/2.1.1-4ubuntu0.15.10.2
  https://launchpad.net/ubuntu/+source/libgd2/2.1.0-3ubuntu0.2
  https://launchpad.net/ubuntu/+source/libgd2/2.0.36~rc1~dfsg-6ubuntu2.2