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Vulnerability of LibTIFF: denial of service via tiff2rgba

Synthesis of the vulnerability 

An attacker can invite the victim to open a malicious image with tiff2rgba of LibTIFF, in order to trigger a denial of service.
Vulnerable products: Debian, LibTIFF, openSUSE, openSUSE Leap, Slackware, Ubuntu.
Severity of this weakness: 2/4.
Creation date: 07/04/2016.
Références of this bulletin: CVE-2016-3622, DLA-795-1, DSA-3762-1, openSUSE-SU-2016:2525-1, openSUSE-SU-2016:2526-1, openSUSE-SU-2016:2544-1, openSUSE-SU-2016:3035-1, openSUSE-SU-2017:0074-1, SSA:2017-098-01, USN-3212-1, USN-3212-2, VIGILANCE-VUL-19320.

Description of the vulnerability 

The LibTIFF product offers the tiff2rgba tool.

However, a malformed TIFF image triggers a division by zero in the fpAcc() function.

An attacker can therefore invite the victim to open a malicious image with tiff2rgba of LibTIFF, in order to trigger a denial of service.
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This vulnerability bulletin impacts software or systems such as Debian, LibTIFF, openSUSE, openSUSE Leap, Slackware, Ubuntu.

Our Vigil@nce team determined that the severity of this security note 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 cybersecurity note.

Solutions for this threat 

LibTIFF: version 4.0.7.
The version 4.0.7 is fixed:
  http://www.simplesystems.org/libtiff/
  http://libtiff.maptools.org/

LibTIFF: workaround for tiff2rgba.
A workaround is to not use tiff2rgba on images from untrusted sources.

Debian 7: new tiff packages (24/01/2017).
New packages are available:
  Debian 7: tiff 4.0.2-6+deb7u9

Debian 8: new tiff packages (16/01/2017).
New packages are available:
  Debian 8: tiff 4.0.3-12.3+deb8u2

openSUSE 13.2: new tiff packages.
New packages are available:
  openSUSE 13.2: tiff 4.0.7-10.35.1

openSUSE 13: new tiff packages.
New packages are available:
  openSUSE 13.1: libtiff 4.0.6-8.28.1
  openSUSE 13.2: libtiff 4.0.6-10.32.1

openSUSE Leap 42.1: new tiff packages.
New packages are available:
  openSUSE Leap 42.1: libtiff 4.0.6-9.1

openSUSE Leap: new tiff packages (09/01/2017).
New packages are available:
  openSUSE Leap 42.2: libtiff5 4.0.7-12.1
  openSUSE Leap 42.1: libtiff5 4.0.7-12.1

Slackware: new libtiff packages (10/04/2017).
New packages are available:
  Slackware 14.2: libtiff 4.0.7-*-1_slack14.2

Ubuntu: new LibTIFF packages.
New packages are available:
  Ubuntu 16.10: LibTIFF-tools 4.0.6-2ubuntu0.2, libtiff5 4.0.6-2ubuntu0.2
  Ubuntu 16.04 LTS: LibTIFF-tools 4.0.6-1ubuntu0.2, libtiff5 4.0.6-1ubuntu0.2
  Ubuntu 14.04 LTS: LibTIFF-tools 4.0.3-7ubuntu0.7, libtiff5 4.0.3-7ubuntu0.7
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