=========================================================================Ubuntu Security Notice USN-3900-1
February 28, 2019

libgd2 vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in GD.

Software Description:
- libgd2: GD Graphics Library

Details:

It was discovered that GD incorrectly handled memory when processing
certain images. A remote attacker could use this issue with a specially
crafted image file to cause GD to crash, resulting in a denial of service,
or possibly execute arbitrary code.

Update instructions:

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

Ubuntu 18.10:
  libgd-tools                     2.2.5-4ubuntu1.1
  libgd3                          2.2.5-4ubuntu1.1

Ubuntu 18.04 LTS:
  libgd-tools                     2.2.5-4ubuntu0.3
  libgd3                          2.2.5-4ubuntu0.3

Ubuntu 16.04 LTS:
  libgd-tools                     2.1.1-4ubuntu0.16.04.11
  libgd3                          2.1.1-4ubuntu0.16.04.11

Ubuntu 14.04 LTS:
  libgd-tools                     2.1.0-3ubuntu0.11
  libgd3                          2.1.0-3ubuntu0.11

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

References:
  https://ubuntu.com/security/notices/USN-3900-1
  CVE-2019-6977, CVE-2019-6978

Package Information:
  https://launchpad.net/ubuntu/+source/libgd2/2.2.5-4ubuntu1.1
  https://launchpad.net/ubuntu/+source/libgd2/2.2.5-4ubuntu0.3
  https://launchpad.net/ubuntu/+source/libgd2/2.1.1-4ubuntu0.16.04.11
  https://launchpad.net/ubuntu/+source/libgd2/2.1.0-3ubuntu0.11