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Security Activity Bulletin

THC-SSL-DOS Denial of Service Application

 
Threat Type:IntelliShield: Applied Mitigation Bulletin
IntelliShield ID:24454
Version:1
First Published:2011 October 25 18:52 GMT
Last Published:2011 October 25 18:52 GMT
Port: Not available
Urgency:Possible use
Credibility:Confirmed
Severity:Mild Damage
 
Version Summary:

The THC-SSL-DOS SSL stress-testing tool could allow an unauthenticated, remote attacker to trigger a denial of service condition on an affected system.

 

Description
 

A German group, The Hacker's Choice, has released an application?named THC-SSL-DOS that leverages the computationally intensive processing of Secure Sockets Layer (SSL) negotiations between a client and a server.?

The implementation of the secure protocol is such that the handling of SSL connections could require an extensive amount of CPU resources on the server.? The application?is designed to leverage this behavior by establishing a large number of SSL connections with a server from a single host or multiple hosts.? Distributed denial of service (DDoS) attacks could also be conducted using this tool.

Reports indicate that the application is also capable of exploiting the flaw within the SSL Secure Renegotiation feature that could result in large amount of renegotiations via a single TCP connection.? A successful exploit could allow the attacker to render the server inaccessible to the Internet, resulting in a DoS condition.

The application is available for Unix as well as for the Microsoft Windows platform and is available as Open-source software.

To mitigate the DoS condition administrators are advised to use?SSL Accelerators within the network and disable the?SSL Secure Renegotiation feature on affected servers.


Signatures
 
Cisco Intrusion Prevention System (IPS) 6.0
Signature IDSignature NameReleaseLatest Release Date
40086/0SSL Denial of Service ToolS6162012 Jan 10 
 
Alert History
 

Initial Release



Product Sets
 
The security vulnerability applies to the following combinations of products.

Primary Products:
IntelliShieldSecurity Activity Bulletin Original Release Base

Associated Products:
N/A




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The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.
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