[TOOL] HLBR - Open Source Intrusion Prevention System

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HLBR - Open Source Intrusion Prevention System
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SUMMARY



DETAILS

IPS HLBR - Version 1.0 can detect malicious traffic using regular
expressions

Version 1.0 of Hogwash Light BR, released march 5th 2006, brings two
interesting new features. The first one is the ability of using regular
expressions to detect intrusion attempts and e-mails with viruses or
phishing. The second is the use of lists with banned words.

HLBR is an IPS (Intrusion Prevention System) that reads network traffic in
the layer 2 of the OSI model. Since it works like a bridge, it stays
in-line in the network topology and doesn't need an IP address. So, HLBR
is invisible to attackers. Traffic filtering (including the packets
contents) can be done with simple rules. Version 1.0 can use regular
expressions to filter the packets. Below is an example of rule with
regular expressions:
<http://hlbr.sourceforge.net/hlbr-rule-1.gif>
http://hlbr.sourceforge.net/hlbr-rule-1.gif

In short, all TCP traffic destined to port 25 of the e-mail server will be
filtered. If the text:
filename="anything_different_of_line_breaks.s__c__r" (ignore underlines)
is found inside the packet, that means there is an attachment (.scr) in
the e-mail (virus). So this packet will suffer the action named 'virus'.
This action logs the event, dumps the malicious traffic in tcpdump format
and drops the packet. Below is an example of rule against a type of buffer
overflow attempt against DNS servers:
<http://hlbr.sourceforge.net/hlbr-rule-2.gif>
http://hlbr.sourceforge.net/hlbr-rule-2.gif

In this case, due to the use of pipe characters (|), HLBR will check the
traffic for the hexadecimal sequence given as an attack signature.

HLBR lets you use rules for blocking attacks against network servers. In
order to fully understand it please read documentation at
<http://hlbr.sourceforge.net/ips-en.html>
http://hlbr.sourceforge.net/ips-en.html, explanations about the IPS
concept including charts.

HLBR homepage is at <http://hlbr.sourceforge.net>
http://hlbr.sourceforge.net


ADDITIONAL INFORMATION

The information has been provided by <mailto:eriberto@xxxxxxxxxxxxxxx>
Eriberto.



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