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Network Security Snort-Signatures
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Re: [Snort-sigs] SNMP Missing Community String Signature FP

from [Matt Kettler] Network Security [Permanent Link]
Subject: Re: [Snort-sigs] SNMP Missing Community String Signature FP
Date: Mon, 10 Jul 2006 19:50:49 -0400 
Eric Hines wrote:

Nigel,

Packet pasted below starting from UDP Header. You are correct, as Jon
pointed out, the 5 byte offset was starting from the UDP header instead
of the Payload.

But it still begs to ask as to why the rule is firing when the payload
does in fact contain the public community string. Why search for |04 00|
? What would the |04 00| be indicative of if the payload does contain
the community string?


That's the terminating sequence for the community string. (End-of-text NUL)

I think the theory is to look for a community string that is just a terminator.

Apparently the theory doesn't work so well in this case.





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