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Gentoo Linux Security Advisory                           GLSA 200908-03
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  Severity: Normal
     Title: libTIFF: User-assisted execution of arbitrary code
      Date: August 07, 2009
      Bugs: #276339, #276988
        ID: 200908-03

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Synopsis
========

Multiple boundary checking vulnerabilities in libTIFF may allow for the
remote execution of arbitrary code.

Background
==========

libTIFF provides support for reading and manipulating TIFF (Tagged
Image File Format) images.

Affected packages
=================

    -------------------------------------------------------------------
     Package          /  Vulnerable  /                      Unaffected
    -------------------------------------------------------------------
  1  media-libs/tiff     < 3.8.2-r8                        >= 3.8.2-r8

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

Two vulnerabilities have been reported in libTIFF:

* wololo reported a buffer underflow in the LZWDecodeCompat()
  function (CVE-2009-2285).

* Tielei Wang of ICST-ERCIS, Peking University reported two integer
  overflows leading to heap-based buffer overflows in the tiff2rgba and
  rgb2ycbcr tools (CVE-2009-2347).

Impact
======

A remote attacker could entice a user to open a specially crafted TIFF
file with an application making use of libTIFF or the tiff2rgba and
rgb2ycbcr tools, possibly resulting in the execution of arbitrary code
with the privileges of the user running the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libTIFF users should upgrade to the latest version:

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/tiff-3.8.2-r8"

References
==========

  [ 1 ] CVE-2009-2285
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2285
  [ 2 ] CVE-2009-2347
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2347

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

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

  http://security.gentoo.org/glsa/glsa-200908-03.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
https://bugs.gentoo.org.

License
=======

Copyright 2009 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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