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Gentoo: libexif Integer overflow vulnerability Print E-mail
User Rating:      How can I rate this item?
Posted by Benjamin D. Thomas   
Gentoo libexif fails to handle Exif (EXchangeable Image File) data inputs, making it vulnerable to an integer overflow. An attacker could entice a user to process a file with specially crafted Exif extensions with an application making use of libexif, which will trigger the integer overflow and potentially execute arbitrary code or crash the application.
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Gentoo Linux Security Advisory                           GLSA 200706-01
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                                            http://security.gentoo.org/
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  Severity: Normal
     Title: libexif: Integer overflow vulnerability
      Date: June 05, 2007
      Bugs: #178081
        ID: 200706-01

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Synopsis
========

libexif fails to handle Exif (EXchangeable Image File) data inputs,
making it vulnerable to an integer overflow.

Background
==========

libexif is a library for parsing, editing and saving Exif data.

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

    -------------------------------------------------------------------
     Package             /  Vulnerable  /                   Unaffected
    -------------------------------------------------------------------
  1  media-libs/libexif      < 0.6.15                        >= 0.6.15

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

Victor Stinner reported an integer overflow in the
exif_data_load_data_entry() function from file exif-data.c while
handling Exif data.

Impact
======

An attacker could entice a user to process a file with specially
crafted Exif extensions with an application making use of libexif,
which will trigger the integer overflow and potentially execute
arbitrary code or crash the application.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All libexif users should upgrade to the latest version. Please note
that users upgrading from "<=media-libs/libexif-0.6.13" should also run
revdep-rebuild after their upgrade.

    # emerge --sync
    # emerge --ask --oneshot --verbose ">=media-libs/libexif-0.6.15"
    # revdep-rebuild --library=/usr/lib/libexif.so

References
==========

  [ 1 ] CVE-2007-2645
        http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2645

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

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

  http://security.gentoo.org/glsa/glsa-200706-01.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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