====================================================================== Secunia Research 11/06/2008 - uTorrent / BitTorrent Web UI HTTP "Range" Header DoS - ====================================================================== 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 * uTorrent 1.7.7 (build 8179) * BitTorrent 6.0.1 (build 7859) NOTE: Other versions may also be affected. ====================================================================== 2) Severity Rating: Less critical Impact: Denial of Service Where: From remote ====================================================================== 3) Vendor's Description of Software "uTorrent is a lightweight and efficient BitTorrent client for Windows with many features.". Product Link: http://www.utorrent.com/ "BitTorrent is the global standard for accessing rich media over the Internet." http://www.bittorrent.com/ ====================================================================== 4) Description of Vulnerability Secunia Research has discovered a vulnerability in uTorrent and BitTorrent, which can be exploited by malicious people to cause a DoS (Denial of Service). The vulnerability is caused due to an error in the handling of HTTP requests and can be exploited to crash the application by sending an HTTP request containing a malformed "Range" header string. Successful exploitation requires that the Web UI interface is enabled (not default). ====================================================================== 5) Solution The vulnerability is fixed in BitTorrent version 6.0.3 (build 8642) and in uTorrent version 1.8beta (build 10524). ====================================================================== 6) Time Table 31/01/2008 - Vendor notified. 04/02/2008 - Vendor notified (2nd attempt). 04/02/2008 - Vendor response. 27/05/2008 - Status update requested. 11/06/2008 - Public disclosure. ====================================================================== 7) Credits Discovered by Dyon Balding, Secunia Research. ====================================================================== 8) References The Common Vulnerabilities and Exposures (CVE) project has assigned CVE-2008-0071 for the vulnerability. ====================================================================== 9) About Secunia Secunia offers vulnerability management solutions to corporate customers with verified and reliable vulnerability intelligence relevant to their specific system configuration: http://corporate.secunia.com/ 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/ 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://corporate.secunia.com/secunia_research/33/ Secunia regularly hires new skilled team members. Check the URL below to see currently vacant positions: http://secunia.com/secunia_vacancies/ Secunia offers a FREE mailing list called Secunia Security Advisories: http://secunia.com/secunia_security_advisories/ ====================================================================== 10) Verification Please verify this advisory by visiting the Secunia website: http://secunia.com/secunia_research/2008-7/ Complete list of vulnerability reports published by Secunia Research: http://secunia.com/secunia_research/ ======================================================================