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Vulnerability of GIMP: use after free in the XCF parser

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area in the XCF file parserof GIMP, in order to trigger a denial of service, and possibly to run code.
Impacted software: Debian, Fedora, GIMP, openSUSE, openSUSE Leap, Solaris, RHEL, Slackware, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 27/06/2016.
Références of this announce: bulletinjan2017, CVE-2016-4994, DLA-525-1, DSA-3612-1, FEDORA-2016-20db5e796b, FEDORA-2016-6122983949, FEDORA-2016-acbd6a75f3, openSUSE-SU-2016:1727-1, RHSA-2016:2589-02, SSA:2016-203-01, USN-3025-1, VIGILANCE-VUL-19972.

Description of the vulnerability 

GIMP is an image processing application.

Its native file format XCF allows to record the multiple layers that make an image and information about their transparency. However, some cases of use after free have been identified in the code that parse XCF files.

An attacker can therefore force the usage of a freed memory area in the XCF file parserof GIMP, in order to trigger a denial of service, and possibly to run code.
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This cybersecurity weakness impacts software or systems such as Debian, Fedora, GIMP, openSUSE, openSUSE Leap, Solaris, RHEL, Slackware, Ubuntu.

Our Vigil@nce team determined that the severity of this security vulnerability is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this vulnerability bulletin.

Solutions for this threat 

GIMP: version 2.8.18.
The version 2.8.18 is fixed:
  http://www.gimp.org/downloads/

Debian: new gimp packages.
New packages are available:
  Debian 8: gimp 2.8.14-1+deb8u1
  Debian 7: gimp 2.8.2-2+deb7u2

Fedora: new gimp packages.
New packages are available:
  Fedora 22: gimp 2.8.16-2.fc22
  Fedora 23: gimp 2.8.16-2.fc23
  Fedora 24: gimp 2.8.16-2.fc24

openSUSE: new gimp packages.
New packages are available:
  openSUSE Leap 42.1: gimp 2.8.16-4.1
  openSUSE 13.2: gimp 2.8.16-3.1

RHEL 7: new gimp packages.
New packages are available:
  RHEL 7: gimp 2.8.16-3.el7

Slackware: new gimp packages.
New packages are available:
  Slackware 14.0: gimp 2.8.18-*-1_slack14.0
  Slackware 14.1: gimp 2.8.18-*-1_slack14.1
  Slackware 14.2: gimp 2.8.18-*-1_slack14.2

Solaris: patch for third party software of January 2017 v1.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Ubuntu: new gimp packages.
New packages are available:
  Ubuntu 15.10: gimp 2.8.14-1ubuntu2.1
  Ubuntu 14.04 LTS: gimp 2.8.10-0ubuntu1.1
  Ubuntu 12.04 LTS: gimp 2.6.12-1ubuntu1.4
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