FP shows snort-2.9.0.3 confused over packets and sessions

[Jason Haar <Jason.Haar () trimble co nz>]

Hi there

This rule just FP'ed here on a user POSTing something. The rule says

alert tcp $EXTERNAL_NET any -> $HTTP_SERVERS $HTTP_PORTS (msg:"WEB-MISC
Sun Java Web Server Webdav Stack Buffer Overflow attempt";
flow:to_server,established; content:"COPY"; depth:4; nocase;
isdataat:200,relative; pcre:"/^COPY(?!\n)\s[^\n]{200}/smi";
metadata:policy balanced-ips drop, policy security-ips drop, service
http; reference:bugtraq,37874; reference:cve,2010-0361;
classtype:attempted-admin; sid:17609; rev:1;)


..but somehow it triggered on a packet (going through a proxy if it
matters) that the snort PCAP states begins with

copy to blah-blah-blah.....

It seems to me this has matched on the beginning of  a *packet* instead
of the beginning of a TCP *session*? What should I be looking at to fix
this? I assume I've got something amiss in stream5 or something? As I
said, I've checked the proxy logs and that was a POST command of 2178
bytes. No HTTP headers/etc shows up in this captured packet - so I'd say
it was the 2nd data packet in the  TCP session

Thanks

-- 
Cheers

Jason Haar
Information Security Manager, Trimble Navigation Ltd.
Phone: +64 3 9635 377 Fax: +64 3 9635 417
PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1


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