-- Corsaire Security Advisory -- Title: Netopia Timbuktu remote buffer overflow issue Date: 20.07.04 Application: Timbuktu v7.0.3 Environment: Mac OS X (10.1, 10.2, 10.3) Author: Stephen de Vries [stephen.de.vries@corsaire.com] Audience: General release Reference: c040720-001 -- Scope -- The aim of this document is to define a vulnerability in the Timbuktu product for Mac OS X, as supplied by Netopia [1], that allows a remote attacker to crash the application and effectively deny service to legitimate users. -- History -- Discovered: 20.07.04 Vendor notified: 27.08.04 Document released: 19.11.04 -- Overview -- The Timbuktu software is shipped as a client/server application that allows remote users to access the desktop of a host system. The server component of this application is vulnerable to a remote buffer overflow vulnerability that, when exploited, causes the server process to crash. -- Analysis -- The server process runs with root privileges on the host Mac OS X and listens for client connections on TCP port 407. By making a number of concurrent connections to this port and repeatedly sending a particular string of data, a memory buffer is overwritten and the server process crashes. -- Recommendations -- Upgrade to version v7.0.4 of the Timbuktu application. -- CVE -- The Common Vulnerabilities and Exposures (CVE) project has assigned the name CAN-2004-0810 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardises names for security problems. -- References -- [1] http://www.netopia.com -- Revision -- a. Initial release. b. Minor detail revision. -- Distribution -- This security advisory may be freely distributed, provided that it remains unaltered and in its original form. -- Disclaimer -- The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise. Corsaire accepts no responsibility for any damage caused by the use or misuse of this information. -- About Corsaire -- Corsaire are a leading information security consultancy, founded in 1997 in Guildford, Surrey, UK. Corsaire bring innovation, integrity and analytical rigour to every job, which means fast and dramatic security performance improvements. Our services centre on the delivery of information security planning, assessment, implementation, management and vulnerability research. A free guide to selecting a security assessment supplier is available at http://www.penetration-testing.com Copyright 2004 Corsaire Limited. All rights reserved.