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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0628 -- [Win][UNIX/Linux] Yahoo! Messenger webcam stream heap overflow 20 August 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Yahoo! Messenger Publisher: US-CERT Operating System: Windows UNIX variants (UNIX, Linux, OSX) Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated Original Bulletin: http://www.kb.cert.org/vuls/id/515968 - --------------------------BEGIN INCLUDED TEXT-------------------- Vulnerability Note VU#515968 Yahoo! Messenger webcam stream heap overflow Overview Yahoo! Messenger fails to properly handle webcam streams, which may allow a remote attacker to execute arbitrary code. I. Description Yahoo! Messenger is an instant messaging application that is available for Windows, Mac, Unix, web, and mobile systems. Some version of Yahoo! Messenger, such as the Windows and Mac versions, support webcam use. When Yahoo! Messenger views a webcam stream, it makes a connection to port 5100/tcp. The webcam video stream is sent as a JPEG 2000 code stream. Yahoo! Messenger appears to require user interaction to connect a webcam stream. Yahoo! Messenger contains a heap overflow in the handling of a malformed JPEG 2000 code streams. Exploit code that causes a denial of service is publicly available. II. Impact A remote attacker may be able to execute arbitrary code with the privileges of the user running Yahoo! Messenger. This vulnerability may also cause a denial of service by causing Yahoo! Messenger to crash. III. Solution Restrict network access This vulnerability can be mitigated by blocking outgoing connections to 5100/tcp. This appears to prevent Yahoo! Messenger from connecting to a webcam stream. Do not accept webcam invitations Until this vulnerability has been addressed by the vendor, do not accept any Yahoo! Messenger webcam invitations, regardless of the source. Systems Affected Vendor Status Date Updated Yahoo, Inc. Vulnerable 17-Aug-2007 References http://www.avertlabs.com/research/blog/index.php/2007/08/15/more-on-the-yahoo-messenger-webcam-0day/ http://www.pcworld.com/article/id,135988-c,instantmessaging/article.html Credit This vulnerability was publicly disclosed by team509. This document was written by Will Dormann. Other Information Date Public 15/08/2007 Date First Published 17/08/2007 11:15:44 Date Last Updated 17/08/2007 CERT Advisory CVE Name Metric 7.70 Document Revision 5 - --------------------------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. 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: 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 iQCVAwUBRskj3ih9+71yA2DNAQLw5QP+JBri3/XwssWRhwYlT3ufpuSVfhtmYkNy siDlOpdi2xZO2EPxDl88oVFC4/w/426fuq2WflkPSoOHdvxPP5MKE4MrAiDERjLj EB/ozXhWGrQ1GCevYflv7ePWJK/71r2csHS52f361BRS+wQnkD757X8B4jhDFEWi 8KKk5xV96Jg= =8rU0 -----END PGP SIGNATURE-----