Snort mailing list archives

Re: Snort 2.8.6-beta and gzip encoding


From: Alex Kirk <akirk () sourcefire com>
Date: Tue, 19 Jan 2010 15:51:47 -0500

I spent this morning testing this myself, and it appears that some bugs
remain in the gzip code - both in regards to stream reassembly and return
codes from zlib that indicate success, but in different ways. I've filed
some internal bugs here, and hopefully fixes will be forthcoming reasonably
soon. For now, though, I wouldn't expect a great deal of success with gzip
decompression.

On Thu, Jan 14, 2010 at 7:52 AM, <luismanuel.carril () usc es> wrote:

Hi
  I have been trying to use the new gzip feature to detect words in
the HTTP body response, but I am unable to detect anything.

  I have compiled Snort with --enable-zlib and at the conf file I
have configured the http_inspect_server  in this way:

preporcessor http_inspect_server: server default \
  profile all ports {80 8080 8180} oversize_dir_length 500
server_flow_depth 1460 extended_response_inspection inspect_gzip
compress_depth 1460 decompress_depth 20480


  Has someone had success with this?

Thanks in advance

Luis M.


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-- 
Alex Kirk
AEGIS Program Lead
Sourcefire Vulnerability Research Team
+1-410-423-1937
alex.kirk () sourcefire com
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Throughout its 18-year history, RSA Conference consistently attracts the
world's best and brightest in the field, creating opportunities for Conference
attendees to learn about information security's most important issues through
interactions with peers, luminaries and emerging and established companies.
http://p.sf.net/sfu/rsaconf-dev2dev
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