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Gentoo Linux Security Advisory                           GLSA 200706-09
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libexif: Buffer overflow
      Date: June 26, 2007
      Bugs: #181922
        ID: 200706-09

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Synopsis
========

libexif does not properly handle image EXIF information, possibly
allowing for the execution of arbitrary code.

Background
==========

libexif is a library for parsing, editing and saving EXIF metadata from
images.

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

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  media-libs/libexif      < 0.6.16                        >= 0.6.16

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

iDefense Labs have discovered that the exif_data_load_data_entry()
function in libexif/exif-data.c improperly handles integer data while
working with an image with many EXIF components, allowing an integer
overflow possibly leading to a heap-based buffer overflow.

Impact
======

An attacker could entice a user of an application making use of a
vulnerable version of libexif to load a specially crafted image file,
possibly resulting in a crash of the application or the execution of
arbitrary code with the rights of the user running the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libexif users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/libexif-0.6.16"

References
==========

  [ 1 ] CVE-2006-4168
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4168

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

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

  http://security.gentoo.org/glsa/glsa-200706-09.xml

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
http://bugs.gentoo.org.

License
=======

Copyright 2007 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

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