Snort mailing list archives

snort not alerting on rule if IE is used


From: "Prashant cd c.d" <cdprashanth () gmail com>
Date: Mon, 9 May 2011 09:11:31 -0400

Hi
I have snort rules to alert for specific host name and URL.
when I tested I see that snort is not alerting if I use internet explorer 8,
but alerting if i use firefox and safari
after analysis , i found that "Host" field is in bottom of request in case
of IE8 , and its on top in other browsers.
My config file has

preprocessor http_inspect_server:  server default \
                                   profile all \
                                   ports { 80 8080 8001 } \
                                   flow_depth -1 \
                                   no_alerts

 .it may be possibel that due to large GET header in IE, it is split into
multiple pkts.
I suspect that snort is not scanning all pkts of header
is it limitation
should i add anything in my conf file or add anything to http_inspect?

thanks for help in advance
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