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icon4.gif  New DoS Tool Kills SSL Servers With Just One PC [message #90444] Fri, 28 October 2011 12:32 Go to next message
SteALth  Romania
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Registered: February 2010
Location: Romania
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Published by German hacker group The Hacker's Choice, the THC-SSL-DOS is designed to highlight weaknesses in SSL and force "the industry" to make SSL more secure.

"We decided to make the official release after realizing that this tool leaked to the public a couple of months ago" the group wrote in a blog post. "We are hoping that the fishy security in SSL does not go unnoticed. The industry should step in to fix the problem so that citizens are safe and secure again. SSL is using an aging method of protecting private data which is complex, unnecessary and not fit for the 21st century."

According to the group, a notebook and a DSL connection is enough to kill a simple SSL server. Larger server farms required 20 notebooks and traffic of about 120 Kbps. The basic feature of THC-SSL-DOS is that it demands renegotiations of encryption keys, which creates up to 1000 parallel connections between the client and the server. As a result, any SSL server is vulnerable to this tool - not just web servers, but email servers as well.

The software is available as a free download for Windows and Unix. Before you download it and use it, keep in mind that using the software will most likely be considered a criminal act.

Source article:
http://www.tomshardware.co.uk/security-attack-DOS-SSL-server -email,news-36844.html

THC SSL-DOS site:
http://www.thc.org/thc-ssl-dos/

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91097 is a reply to message #90444] Wed, 16 November 2011 11:34 Go to previous messageGo to next message
uzer is currently offline uzer  Philippines
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Registered: November 2011
Location: Manila, Philippines
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thanks for the share

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91184 is a reply to message #91097] Fri, 18 November 2011 08:39 Go to previous messageGo to next message
thunder11 is currently offline thunder11  
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Registered: September 2010
Location: Serbia
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Yes, they are good bunch of people. I find about them long time ago while searching for good security scanner (thc hydra) and was impressed what I could do with basic knowledge about Linux. Anyhow, thanks for the link. Will try it against my server Wink (when I figure out exactly what it does)

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91498 is a reply to message #91184] Thu, 24 November 2011 00:04 Go to previous messageGo to next message
Anik is currently offline Anik  
Messages: 496
Registered: July 2011
Location: India
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is it about breaking the encryption and then hacking a a/c?

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91510 is a reply to message #91498] Thu, 24 November 2011 06:56 Go to previous messageGo to next message
thunder11 is currently offline thunder11  
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Location: Serbia
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How do u mean?

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91520 is a reply to message #91510] Thu, 24 November 2011 10:01 Go to previous messageGo to next message
Anik is currently offline Anik  
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Registered: July 2011
Location: India
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about hacking someones account which is protected by SSL encryption.

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91592 is a reply to message #91520] Fri, 25 November 2011 10:22 Go to previous messageGo to next message
shazar is currently offline shazar  United States
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Anik - I don't think that is what this tool is about though. This tool does a DoS attack on any server offering an SSL connection. That attack would bog the server down or kill the service altogether.

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91691 is a reply to message #91592] Mon, 28 November 2011 13:01 Go to previous messageGo to next message
Anik is currently offline Anik  
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But shazar does a different dos tool need to attack server which is using ssl connection? why?

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91692 is a reply to message #91691] Mon, 28 November 2011 13:03 Go to previous messageGo to next message
shazar is currently offline shazar  United States
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I don't understand your question.

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91693 is a reply to message #91691] Mon, 28 November 2011 13:07 Go to previous messageGo to next message
Anik is currently offline Anik  
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also how to prevent it? by blocking such ip which are causing the attack?

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91694 is a reply to message #91693] Mon, 28 November 2011 13:13 Go to previous messageGo to next message
Anik is currently offline Anik  
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Registered: July 2011
Location: India
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a normal dos attack tool can't work for ssl prtected site?

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91697 is a reply to message #91694] Mon, 28 November 2011 14:27 Go to previous messageGo to next message
shazar is currently offline shazar  United States
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I still don't completely get what you are saying about a normal tool, but I imagine you could carefully craft an iptables rule to block an IP for X seconds if X connection attempts are made in X seconds. KeepAlive may interefere with that. Sorry I really don't know too much about that, just making an attempt to answer.

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Re: New DoS Tool Kills SSL Servers With Just One PC [message #91698 is a reply to message #91697] Mon, 28 November 2011 15:11 Go to previous message
Anik is currently offline Anik  
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Registered: July 2011
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normal sites means who have no ssl support.

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