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:
https://wiki.ubuntu.com/Security/Upgrades.

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

References

CVE-2016-6911,

CVE-2016-7568,

CVE-2016-8670

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