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dnsattacks
2007 Apr 18
2
[Bridge] IPS HLBR 1.0 released (off-topic)
...on 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:
<rule>
ip dst(dns)
udp dst(53)
udp nocase(|41cd 80c7 062f 6269 6ec7 4604 2f73 6800 89f0 83c0 0889 4608|)
message=(dnsattacks-1) tsl bind attack
action=action1
</rule>
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...