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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0415 -- [Win][UNIX/Linux] Multiple Vendor libexif Integer Overflow Heap Corruption Vulnerability 14 June 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: libexif Publisher: iDefense Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact: Execute Arbitrary Code/Commands Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2006-4168 Original Bulletin: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=543 - --------------------------BEGIN INCLUDED TEXT-------------------- Multiple Vendor libexif Integer Overflow Heap Corruption Vulnerability iDefense Security Advisory 06.13.07 http://labs.idefense.com/intelligence/vulnerabilities/ Jun 13, 2007 I. BACKGROUND Exchangeable image file format (Exif) is an industry standard image tagging technology used by many digital camera devices. libexif is an open source library for handling the Exif format. More information can be found at the URLs shown below. http://en.wikipedia.org/wiki/Exif http://libexif.sourceforge.net/ II. DESCRIPTION Remote exploitation of a integer overflow vulnerability in libexif, as included in various vendors' operating system distributions, could allow attackers to crash the process or execute arbitrary code. The problem exists while parsing a tagged image with a large number of Exif components. Applications using this library are susceptible to a heap overflow when an integer overflow is triggered in the exif_data_load_data_entry function. III. ANALYSIS Exploitation requires that a targeted user process a malicious image using one of several available tools that utilize libexif for Exif tag parsing. These tools include, but are not limited to, several applications included in the GNOME and KDE desktops. IV. DETECTION iDefense confirmed the existence of this vulnerability in versions 0.6.13 through 0.6.15 of libexif. V. WORKAROUND iDefense is currently unaware of any workarounds for this issue. VI. VENDOR RESPONSE The libexif maintainers have released version 0.6.16 of libexif to address this vulnerability. VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-4168 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 08/16/2006 Initial vendor notification 06/05/2007 Second vendor notification 06/11/2007 Initial vendor response 06/13/2007 Coordinated public disclosure IX. CREDIT This vulnerability was discovered by Sean Larsson (iDefense Labs). Get paid for vulnerability research http://labs.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES Copyright © 2007 iDefense, Inc. Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without the express written consent of iDefense. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please e-mail customerservice@idefense.com for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. 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Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRnCxoih9+71yA2DNAQI88AQAmkjZ3nQL8UiRimUibNklFOq3RuotgFyJ 1OySEa8HzFtNtdL6qoLRWd+udK9IpNIgG/F4WwqPTL/tmRW835inZ3bGrNDzrmLG wBmbd7LawNWZ6P86U5xctPQOt/tZl18axaJoMzUINZRigskAQvptJubTz2fE3YBU BbNzpuTEXjY= =Kx1j -----END PGP SIGNATURE-----