THC-SSL-DoS (New Attacking Tool Targets Web-Servers Using Secured Connections)



A newly released denial-of-service (DoS) tool can be used to bring down SSL servers using an average laptop computer and a standard DSL connection. Called THC-SSL-DoS,  the tool was created by German hacking outfit The Hackers Choice (THC) and exploits a rarely used, but widely available, feature in the SSL protocol called SSL renegotiation.

Features:-

  • THC-SSL-DOS is a tool to verify the performance of SSL.
  • Establishing a secure SSL connection requires 15x more processing power on the server than on the client.
  • THC-SSL-DOS exploits this asymmetric property by overloading the server and knocking it off the Internet.
  • This problem affects all SSL implementations today. The vendors are aware of this problem since 2003 and the topic has been widely discussed.
  • This attack further exploits the SSL secure Renegotiation feature to trigger thousands of renegotiations via single TCP connection.
Counter Measurements:-
No real solutions exists. The following steps can mitigate (but not solve) the problem:
  • Disable SSL-Renegotiation
  • Invest into SSL Accelerator
Download:-
Windows binary: thc-ssl-dos-1.4-win-bin.zip
Unix Source   :    thc-ssl-dos-1.4.tar.gz


For more information click here


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