FortiGuard Center

FortiGuard Advisory (FGA-2008-15)



Xunlei Thunder ActiveX Control Remote Code Execution Vulnerability
2008.June.19

Summary:

Thunder is a downloader tool based on the P2SP (Peer to Server Peer) technology. A memory corruption vulnerability exists in Thunder's ActiveX Control. A remote attacker could exploit it by crafting a malicious HTML document. Upon viewing the document in his/her browser or mail client, a targeted user would unwillingly execute arbitrary code designed by the attacker.

Impact:

Full compromise of the targeted system.

Risk:
  • Critical

Affected Software:
  • Xunlei Thunder 5

Additional Information:

  • The vulnerability exists in the "Put()" method handled in "DapCtrl" DLL file version 1.5.578.28 and later versions.
  • Thunder is a very popular tool in China.

Solutions:
  • Upgrade to latest version available from http://www.xunlei.com.
  • Disable the Xunlei Thunder ActiveX control by setting kill bit for CLSID "ACACC6EB-1FBA-4E13-A729-53AEB2DF54F8".
  • The FortiGuard Global Security Research Team released a signature “Xunlei.Thunder.Put.DapCtrl.ActiveX.Control.Access” on June 16th, 2008, which covers this specific vulnerability.

Fortinet customers who subscribe to Fortinet’s intrusion prevention (IPS) service are protected against this illegal remote access vulnerability. Fortinet’s IPS service is one component of FortiGuard Subscription Services, which also offer comprehensive solutions such as antivirus, Web content filtering and antispam capabilities. These services enable protection against threats on both application and network layers. FortiGuard Services are continuously updated by the FortiGuard Global Security Research Team, which enables Fortinet to deliver a combination of multi-layered security intelligence and true zero-day protection from new and emerging threats. These updates are delivered to all FortiGate, FortiMail and FortiClient products. Fortinet strictly follows responsible disclosure guidelines to ensure optimum protection during a threat's lifecycle.

References:

Acknowledgment:
  • Haifei Li of Fortinet's FortiGuard Global Security Research Team


Disclaimer:

Although Fortinet has attempted to provide accurate information in these materials, Fortinet assumes no legal responsibility for the accuracy or completeness of the information. More specific information is available on request from Fortinet. Please note that Fortinet's product information does not constitute or contain any guarantee, warranty or legally binding representation, unless expressly identified as such in a duly signed writing.

About Fortinet ( www.fortinet.com ):

Fortinet is the pioneer and leading provider of ASIC-accelerated unified threat management, or UTM, security systems, which are used by enterprises and service providers to increase their security while reducing total operating costs. Fortinet solutions were built from the ground up to integrate multiple levels of security protection--including firewall, antivirus, intrusion prevention, VPN, spyware prevention and anti-spam -- designed to help customers protect against network and content level threats. Leveraging a custom ASIC and unified interface, Fortinet solutions offer advanced security functionality that scales from remote office to chassis-based solutions with integrated management and reporting. Fortinet solutions have won multiple awards around the world and are the only security products that are certified in six programs by ICSA Labs: (Firewall, Antivirus, IPSec, SSL, Network IPS, and Anti-Spyware). Fortinet is privately held and based in Sunnyvale, California.