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Visto che c’è chi ci prova sempre a bucare il nostro website…

[Sun Nov 15 22:39:48 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Sat Nov 21 04:38:59 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Sat Nov 21 05:19:41 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Sat Nov 21 20:49:55 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Wed Nov 25 06:23:15 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Thu Nov 26 04:22:24 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Fri Nov 27 06:23:02 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Fri Nov 27 07:00:35 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Fri Dec 04 08:37:26 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Fri Dec 04 22:20:37 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Tue Dec 08 06:13:16 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Tue Dec 08 11:30:17 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Wed Dec 09 06:32:59 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Fri Dec 11 01:57:56 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Fri Dec 11 05:30:52 2009] [error] [client xxx.xxx.xxx.xxx] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)

con questo script molto semplice e ben fatto (trovato gia pronto su internet) è possibile aggiungere in automatico un drop su iptables per bloccare tutti quegli ip che provano a sfruttare Web Vulnerability Scanner tipo DFind, basta copiare il codice evidenziato qui sotto in un file tipo w00tw00t.sh e farlo girare con il cron.

#!/bin/sh
# add iptables drop for w00tw00t scan

for ip in `cat /var/log/apache2/error_log |grep w00tw00t | awk ‘{print $8}’ | sed ‘s/]//g’  | sort -ug` ; do
countoff=$[$countoff+1]
countwoot=$[$countwoot+1]
iptables -I INPUT -s $ip -j DROP
iptables -I OUTPUT -s $ip -j DROP