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Gentoo Linux Security Advisory                           GLSA 201612-55
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: libjpeg-turbo: User-assisted execution of arbitrary code
     Date: December 31, 2016
     Bugs: #585782
       ID: 201612-55

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Synopsis
=======
An out-of-bounds read in libjpeg-turbo might allow remote attackers to
execute arbitrary code.

Background
=========
libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX,
SSE2, NEON, AltiVec) to accelerate baseline JPEG compression and
decompression.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  media-libs/libjpeg-turbo
                                  < 1.5.0                    >= 1.5.0

Description
==========
The accelerated Huffman decoder was previously invoked if there were
128 bytes in the input buffer. However, it is possible to construct a
JPEG image with Huffman blocks > 430 bytes in length. This release
simply increases the minimum buffer size for the accelerated Huffman
decoder to 512 bytes, which should accommodate any possible input.

Impact
=====
A remote attacker could coerce the victim to run a specially crafted
image file resulting in the execution of arbitrary code.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All libjpeg-turbo users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=media-libs/libjpeg-turbo-1.5.0"

References
=========
[ 1 ] LJT-01-005
      https://wiki.mozilla.org/images/7/77/Libjpeg-turbo-report.pdf
[ 2 ] Prevent overread when decoding malformed JPEG

https://github.com/libjpeg-turbo/libjpeg-turbo/commit/0463f7c9aad060fcd56e98d025ce16185279e2bc

Availability
===========
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

 https://security.gentoo.org/glsa/201612-55

Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
======
Copyright 2016 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5/