====================================================================== Secunia Research 02/02/2009 - Free Download Manager Torrent Parsing Buffer Overflows - ====================================================================== Table of Contents Affected Software....................................................1 Severity.............................................................2 Vendor's Description of Software.....................................3 Description of Vulnerability.........................................4 Solution.............................................................5 Time Table...........................................................6 Credits..............................................................7 References...........................................................8 About Secunia........................................................9 Verification........................................................10 ====================================================================== 1) Affected Software * Free Download Manager 2.5 Build 758 * Free Download Manager 3.0 Build 844 NOTE: Other versions may also be affected. ====================================================================== 2) Severity Rating: Highly critical Impact: System compromise Where: Remote ====================================================================== 3) Vendor's Description of Software "What is Free Download Manager? It is a powerful, easy-to-use and absolutely free download accelerator and manager. Moreover, FDM is 100% safe, open-source software distributed under GPL license.". Product Link: http://www.freedownloadmanager.org/ ====================================================================== 4) Description of Vulnerability Secunia Research has discovered some vulnerabilities in Free Download Manager, which can be exploited by malicious people to compromise a user's system. 1) A boundary error in the parsing of file names inside torrent files can be exploited to cause a heap-based buffer overflow via an overly long file name. 2) Two boundary errors when parsing names from torrent files can be exploited to cause stack-based buffer overflows via overly long file names. 3) A boundary error when parsing tracker URLs from torrent files can be exploited to cause a stack-based buffer overflow via an overly long tracker URL. 4) A boundary error when parsing comments from torrent files can be exploited to cause a stack-based buffer overflow via an overly long comment. Successful exploitation of the vulnerabilities allows execution of arbitrary code by e.g. tricking a user into opening a specially crafted torrent file. ====================================================================== 5) Solution Update to version 3.0 build 848. ====================================================================== 6) Time Table 20/01/2009 - Form submitted on the vendor's website asking for e-mail address of security contact. 27/01/2009 - E-mail sent to various e-mail addresses asking for contact information of security contact. 27/01/2009 - Vendor response (e-mail address of security contact provided). 28/01/2009 - Vulnerability details sent to the vendor. 28/01/2009 - Fixed version provided for testing by the vendor. 28/01/2009 - Vendor informed that all vulnerabilities have not been properly fixed. 30/01/2009 - New fixed version provided by the vendor. 30/01/2009 - Vendor informed that all vulnerabilities are fixed. 31/01/2009 - Vendor issues fixed version. 02/02/2009 - Public disclosure. ====================================================================== 7) Credits Discovered by Carsten Eiram, Secunia Research. ====================================================================== 8) References The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2009-0184 for the vulnerabilities. ====================================================================== 9) About Secunia Secunia offers vulnerability management solutions to corporate customers with verified and reliable vulnerability intelligence relevant to their specific system configuration: http://secunia.com/advisories/business_solutions/ Secunia also provides a publicly accessible and comprehensive advisory database as a service to the security community and private individuals, who are interested in or concerned about IT-security. http://secunia.com/advisories/ Secunia believes that it is important to support the community and to do active vulnerability research in order to aid improving the security and reliability of software in general: http://secunia.com/secunia_research/ Secunia regularly hires new skilled team members. Check the URL below to see currently vacant positions: http://secunia.com/corporate/jobs/ Secunia offers a FREE mailing list called Secunia Security Advisories: http://secunia.com/advisories/mailing_lists/ ====================================================================== 10) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2009-5/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================