[Snort-sigs] False positive on "DDOS mstream handler to client"

Christiaan Ehlers christiaan.ehlers at ...3312...
Fri Aug 3 15:24:56 EDT 2007


Hi

I found a false positive for rule "classtype:attempted-dos; sid:248; rev:4;".  The trigger was an RTP packet that uses random high ports which happend to be 12754.  Since the RTP data is pretty much random as well it also contained the string ">".

Payload of my packet:
length = 30

000 : 03 00 00 1E 22 C0 00 02 04 80 13 4C 00 C3 26 1C   ...."......L..&.
010 : FA 40 3E 00 C3 26 1C FA 40 3F 03 00 01 00         .@>..&..@?....
As stated this was from a Cisco Voip gateway to a software call agent.
Kind Regards
Christiaan Ehlers

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