Several security issues were fixed in Imlib2.
Jakub Wilk discovered an out of bounds read in the GIF loader implementation in Imlib2. An attacker could use this to cause a denial of service (application crash) or possibly obtain sensitive information. (CVE-2016-3994)
9 September 2016
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in Imlib2.
Jakub Wilk discovered an out of bounds read in the GIF loader implementation in Imlib2. An attacker could use this to cause a denial of service (application crash) or possibly obtain sensitive information. (CVE-2016-3994)
Yuriy M. Kaminskiy discovered an off-by-one error when handling coordinates in Imlib2. An attacker could use this to cause a denial of service (application crash). (CVE-2016-3993)
Yuriy M. Kaminskiy discovered that integer overflows existed in Imlib2 when handling images with large dimensions. An attacker could use this to cause a denial of service (memory exhaustion or application crash). (CVE-2014-9771, CVE-2016-4024)
Kevin Ryde discovered that the ellipse drawing code in Imlib2 would attempt to divide by zero when drawing a 2x1 ellipse. An attacker could use this to cause a denial of service (application crash). (CVE-2011-5326)
It was discovered that Imlib2 did not properly handled GIF images without colormaps. An attacker could use this to cause a denial of service (application crash). This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-9762)
It was discovered that Imlib2 did not properly handle some PNM images, leading to a division by zero. An attacker could use this to cause a denial of service (application crash). This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-9763)
It was discovered that Imlib2 did not properly handle error conditions when loading some GIF images. An attacker could use this to cause a denial of service (application crash). This issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2014-9764)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you will need to restart applications that make use of Imlib2 to make all the necessary changes.
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