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Gentoo Linux Security Advisory                           GLSA 200712-17
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: exiftags: Multiple vulnerabilities
      Date: December 29, 2007
      Bugs: #202354
        ID: 200712-17

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Synopsis
========

Multiple vulnerabilities in exiftags possibly allow for the execution
of arbitrary code or a Denial of Service.

Background
==========

exiftags is a library and set of tools for parsing, editing and saving
Exif metadata from images. Exif, the Exchangeable image file format,
specifies the addition of metadata tags to JPEG, TIFF and RIFF files.

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

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  media-gfx/exiftags       < 1.01                           >= 1.01

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

Meder Kydyraliev (Google Security) discovered that Exif metadata is not
properly sanitized before being processed, resulting in illegal memory
access in the postprop() and other functions (CVE-2007-6354). He also
discovered integer overflow vulnerabilities in the parsetag() and other
functions (CVE-2007-6355) and an infinite recursion in the readifds()
function caused by recursive IFD references (CVE-2007-6356).

Impact
======

An attacker could entice the user of an application making use of
exiftags or an application included in exiftags to load an image file
with specially crafted Exif tags, possibly resulting in the execution
of arbitrary code with the privileges of the user running the
application or a Denial of Service.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All exiftags users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-gfx/exiftags-1.01"

References
==========

  [ 1 ] CVE-2007-6354
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6354
  [ 2 ] CVE-2007-6355
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6355
  [ 3 ] CVE-2007-6356
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6356

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

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

  http://security.gentoo.org/glsa/glsa-200712-17.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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