27 February 2008
Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0212 -- [Win][UNIX/Linux] Mozilla Thunderbird MIME External-Body Heap Overflow Vulnerability 27 February 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Thunderbird version 184.108.40.206 and prior Publisher: iDEFENSE Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated CVE Names: CVE-2008-0304 Original Bulletin: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=668 - --------------------------BEGIN INCLUDED TEXT-------------------- iDefense Security Advisory 02.26.08 http://labs.idefense.com/intelligence/vulnerabilities/ Feb 26, 2008 I. BACKGROUND Mozilla Thunderbird is an open source electronic mail client and news reader. Multipurpose Internet Message Extensions (MIME) is a standard that defines how non-text attachments and other data are handled in electronic mail. The external-body MIME type is used for retrieving a resource that is referenced in the message, such as an attachment. For more information, see the vendor's website at the following URL. http://www.mozilla.com/en-US/thunderbird/ II. DESCRIPTION Remote exploitation of a heap based buffer overflow vulnerability in Mozilla Organization's Thunderbird could allow an attacker to execute arbitrary code with the privileges of the current user. The vulnerability exists when parsing the external-body MIME type in an electronic mail. When calculating the number of bytes to allocate for a heap buffer, sufficient space is not reserved for all of the data being copied into the buffer. This results in up to 3 bytes of the buffer being overflowed, potentially allowing for the execution of arbitrary code. III. ANALYSIS Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the user running Thunderbird. Exploitation requires that an attacker social engineers a user into viewing a malicious message in Thunderbird. If the 'View->Message Pane' option is turned on (the "Preview" pane), which is the default, then all a targeted user has to do is select the message in the browsing pane. Once the message is previewed, the vulnerability will be triggered. IV. DETECTION iDefense has confirmed the existence of this vulnerability in Thunderbird version 220.127.116.11 on Linux and Windows. Previous versions may also be affected. V. WORKAROUND Setting the "mailnews.display.disallow_mime_handlers" configuration property to any value >= 3 will prevent the vulnerable code from being triggered. VI. VENDOR RESPONSE The Mozilla Foundation has addressed this vulnerability by releasing version 18.104.22.168 of Thunderbird. For more information, refer to their advisory at the following URL. http://www.mozilla.org/security/announce/2008/mfsa2008-12.html VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2008-0304 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 01/14/2008 Initial vendor notification 01/14/2008 Initial vendor response 02/26/2008 Coordinated public disclosure IX. CREDIT This vulnerability was reported to VeriSign iDefense by regenrecht. 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 © 2008 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 firstname.lastname@example.org 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 email@example.com 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. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. 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: firstname.lastname@example.org 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 iQCVAwUBR8TGJih9+71yA2DNAQIFsAQAjcTkXdDMtmMmc8rt2td5gdzEWjt9jcdy wIdXiuii4/rZodjicgOKU2VgIqfJD6PoWMXA6a7CwwwosXKMQINtDNo4A5Xgu+4s Hwh/ap+/rQxuZ3tJ8EZ3jaGQ0qMFLGMS68LlSrZOs1ieb2ATcyXn9uVO+Zx0pf0j UehqKke/y6U= =9SYg -----END PGP SIGNATURE-----