Re: DOUBLE DECODING ATTACK

[Eric Hines <eric.hines () appliedwatch com>]

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Julien,

You will want to tune your http_inspect preprocessor by creating Web
Server profiles for each of your web servers. Documentation is available
at
http://www.snort.org/docs/snort_htmanuals/htmanual_260/node11.html#SECTION003111000000000000000

Read and understand the different http_inspect_server options and decide
which ones to use.

Example:

preprocessor http_inspect_server: server 10.1.1.1 \
                        ports { 80 3128 8080 } \
                        flow_depth 0 \
                        ascii no \
                        double_decode yes \
                        non_rfc_char { 0x00 } \
                        chunk_length 500000 \
                        non_strict \
                        no_alerts



Best Regards,

Eric S. Hines, GCIA, CISSP
CEO, President, Chairman
Applied Watch Technologies, LLC


- --------------------------------------------------

Eric S. Hines, GCIA, CISSP
CEO, President, Chairman
Applied Watch Technologies, LLC

- --------------------------------------------------

Email:   eric.hines () appliedwatch com
Address: 1095 Pingree Road
         Suite 221
         Crystal Lake, IL
         60014
Tel:     (877) 262-7593 ext:327
Local:   (847) 854-5831
Fax:     (847) 854-5106
Web:     http://www.appliedwatch.com

- --------------------------------------------------
Security Management for the Open Source Enterprise





Julien VARLET wrote:
> Hi,
>
> I get a lot of DOUBLE DECODING ATTACK when http preprocessor is active, but it is only false positives... I do not 
> want to desactivate http preprocessor. How can I do ?
>
> Thanks.
>
>
> To: snort.user () gmail com
>     snort-users () lists sourceforge net
>     snort-devel () lists sourceforge net
>
>
>
> -------------------------------------------------------------------------
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-------------------------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642

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