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Gentoo Linux Security Advisory                           GLSA 201708-10
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: jbig2dec: User-assisted execution of arbitrary code
     Date: August 26, 2017
     Bugs: #616464
       ID: 201708-10

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Synopsis
========

Multiple integer overflow flaws have been discovered in jbig2dec,
possibly resulting in execution of arbitrary code or Denial of Service.

Background
==========

jbig2dec is a decoder implementation of the JBIG2 image compression
format.

Affected packages
=================

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  media-libs/jbig2dec         < 0.13-r4                 >= 0.13-r4 

Description
===========

Integer overflow errors have been discovered in the
jbig2_decode_symbol_dict, jbig2_build_huffman_table, and
jbig2_image_compose functions of jbig2dec.

Impact
======

A remote attacker, by enticing a user to open a specially crafted JBIG2
file using an application linked against jbig2dec, could possibly
execute arbitrary code with the privileges of the process or cause a
Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All jbig2dec users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=media-libs/jbig2dec-0.13-r4"

References
==========

[ 1 ] CVE-2017-7885
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7885
[ 2 ] CVE-2017-7975
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7975
[ 3 ] CVE-2017-7976
      http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-7976

Availability
============

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

 https://security.gentoo.org/glsa/201708-10

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 2017 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.

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