Check Point Advisories

Thunder

Vulnerability
Protection

Check Point Reference:	SBP-2009-01
Date Published:	21 Dec 2008
Severity:	N/A
Last Updated:	Tuesday 06 January, 2009
Source:
Protection Provided by:	Security Gateway R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	Thunder (AKA Xunlei) is a popular peer to peer Chinese download manager and file sharing client that supports BitTorrent, eDonkey, Kad, and FTP. Thunder accelerates downloads by accessing its proprietary P2P network in addition to the given HTTP download. There are cases in which certain traffic, although not intended for malicious use, is very unsafe, since it may transfer shellcode which is undetectable by IPS.

Protection Overview

This protection will detect and block the propriety Thunder protocol attempts to connect to the internet.In order to block the Thunder application from using other protocols (such as FTP or BitTorrent), use the relevant IPS Protection.A Monitor Only mode makes it possible to track unauthorized access attempts without blocking them.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R77 / R75 / R71 / R70 / R65

In the IPS tab, click Protections and find the Thunder protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Peer to Peer.
Attack Information: Thunder protocol detected on connection