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Network Security Snort-Signatures
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Re: [Snort-sigs] Snorting gzip encoded http source code

Subject: Re: [Snort-sigs] Snorting gzip encoded http source code
Date: Tue, 31 Aug 2004 11:43:41 +1200
On Mon, Aug 30, 2004 at 06:58:09PM +0000, Abe Use wrote:
I suppose I'll have my users connect through a proxy, and I'll have it 
strip or replace the "accept encoding gzip" portion of the header- so that 
I can match content plain-text. Would be cool though if snort was able to 
inflate the gzip'd stream, and look through the content... or save the 
stream and I could use something else to parse through it...

Yes - that feature makes NIDS increasingly useless for Web traffic. Similar
problem to HTTPS - and I think your solution mis similar to how we handle
HTTPS (put in a reverse proxy and sniff the unencrypted side). However
it'll mean you don't get any of the performance benefits of compressed
traffic - which is a pity...


A "uncompressor" preprocessor would be nice - but I have no idea what the
performance impact would be...

-- 
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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