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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2008.0482 -- [Win] Multimedia PC Client - Potential Vulnerability Due to Buffer Overflow 9 May 2008 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Multimedia PC Client Publisher: Nortel Operating System: Windows Impact: Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2008-2080 Original Bulletin: http://support.nortel.com/go/main.jsp?cscat=BLTNDETAIL&id=719698 - --------------------------BEGIN INCLUDED TEXT-------------------- Multimedia PC Client - Potential Vulnerability Due to Buffer Overflow BULLETIN ID: 2008008799, Rev 1 PUBLISHED: 2008-04-30 STATUS: Active REGION: All PRIORITY: Critical TYPE: Security Advisory Source: Nortel would like to acknowledge Parvez Anwar for bringing this matter to Nortel's attention. Nortel welcomes and encourages independent researchers to report any potential vulnerabilities via Email <mailto:NNSATF@nortel.com> and will work with these parties to assist in data validation to ensure responsible disclosure and attribution. Overview: Nortel has been made aware of a potential vulnerability that may cause the Multimedia PC Client to experience a Buffer Overflow - Flooding the Multimedia PC Client with extraneous messaging can result in the PC Client terminating with an error message. This may also occur when scanning the Multimedia PC Client with the Nessus (www.nessus.org) tool using the "Denial of Service" plug-in, and it is called "Generic flood". Before taking any action please ensure that you are viewing the latest official version of this security advisory by referencing http://www.nortel.com/securityadvisories For more information: Please contact your next level of support or visit http://www.nortel.com/contact for support numbers within your region. Nortel security advisories: http://nortel.com/securityadvisories Nortel Partner Information Center (PIC) website: http://www.nortelnetworks.com/pic Symptoms: When the MultiMedia PC Client is flooded with extraneous messages it can result in the application aborting. Prevention: This potential vulnerability can be prevented by upgrading to the latest software as described in the Resolution section. Mitigation: There are no mitigation steps to address this vulnerability, as it is resolved with a software update. See the Resolution section. Risk: This attack can cause a DoS type situation on the Multimedia PC client and has been brought to Nortel's attention by Parvez Anwar. To our knowledge, this attack has not been launched against any of our customers. Resolution: To address this vulnerability, Nortel recommends upgrading the Multimedia PC Client to the latest version. For MCS 5100 Release 3.5 Systems, upgrade to Maintenance Release 3.5.8.3. For MCS 5100 4.0 systems, upgrade to Maintenance Release 4.0.25.3. Further information and downloads are available on the Nortel Partner Information Center (PIC) <http://www.nortel.com/pic>. To navigate to the MCS 5100 download page of the PIC use the following steps: 1. Log in to the PIC <http://www.nortel.com/pic> 2. Select "Voice, Multimedia & Unified Communications" 3. Select "Multimedia Communication Server 5100" 4. Select "Software Downloads" on the left Once at the MCS 5100 page of the PIC: - Obtain the 4.0 Maintenance Release by selecting "MCS 5100 Rls 4.0.25.3 Maintenance Release" - Obtain the 3.5 Maintenance Release by selecting "MCS 5100 Rls 3.5.8.3 Maintenance Release" For more information on the MCS 5100, refer to this overview on nortel.com: <http://products.nortel.com/go/product_content.jsp?segId=0&catId=null&parId=0&prod_id=52080&locale=en-US> Attachments: There are no attachments for this bulletin Products and Releases: The information in this bulletin is intended to be used with the following products and associated releases: PRODUCT RELEASE Multimedia Comm.-MCS5100-MCS5100 3.5 Multimedia Comm.-MCS5100-MCS5100 4.0 Multimedia Comm.-MCS5100-MCS5100 To view the most recent version of this bulletin, access technical documentation, search our knowledge base, or to contact a Technical Support Representative, please visit Nortel Technical Support on the web at: http://support.nortel.com/. You may also sign up to receive automatic email alerts when new bulletins are published. REFERENCE: PRE-REQUIRED PATCH: PATCH ID: Copyright 2007 Nortel Networks. All rights reserved. Information in this document is subject to change without notice. Nortel assumes no responsibility for any errors that may appear in this document. The information in this document is proprietary to Nortel Networks. Nortel recommends any maintenance activities, such as those outlined in this bulletin, be completed during a local maintenance window. Nortel, the Nortel logo, and the Globemark design are trademarks of Nortel Networks. All other trademarks are the property of their respective owners. - --------------------------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 iQCVAwUBSCPAJyh9+71yA2DNAQLISgP/ZkVmpcWV/O+85ewCLUw+9jmI0nZ5Uweo cESZqDDFtGQJh+ElHeaoTJN1p94h6dy7xvliqaCFgd4RPS13Cb+zWaQa/9wu8FX9 zGn2/ES1voHWYfEo+6VUsSaFodBEQY7o8twOUw/xvWctT5P7KAhIFeA4M9aQoftp kyVLWjQfsic= =9OzF -----END PGP SIGNATURE-----