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From: macadanet@yahoo.es
To: lista de correo netfilter <netfilter-devel@lists.netfilter.org>
Subject: string match -> new option
Date: Sat, 1 Mar 2003 02:53:08 +0100	[thread overview]
Message-ID: <15760529186.20030301025308@yahoo.es> (raw)

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Hi.

I'm sorry for my english

I modificated ipt_string.c and I created a new patch. This patch
acepts regular expresions.

For example:

iptables -A INPUT -m string --string '"GET"[0-9]"HTTP"' -j LOG

If some package includes the string: GET ???????8????????? HTTP
the system will write in log file.

It's a good idea, for firewalls between WAN network (Internet) and LAN
network where exists some IIS server (Internet Information Servers).
This server are great bugs when received bad requests like:

"http://www.servidor.com/msadc/..%c0%af../..%c0%af../..%c0%af../winnt/system32/cmd.exe?/c+dir+c:\"
attack with Unicodes


GET http://<ipaddress>/default.ida?NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN%u9090%u6858%ucbd3%u7
801%u9090%u6858%ucbd3%u7801%u9090%u6858%ucbd3%u7801%u9090%u9090%u8190%
u00c3%u0003%u8b00%u531b%u53ff%u0078%u0000%u00=a HTTP/1.0
Red Code Virus.

this solution can be apply to diferents kind servers.


What do people think? Is a good idea?


Thanks for read this (my) email.


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             reply	other threads:[~2003-03-01  1:53 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-03-01  1:53 macadanet [this message]
2003-03-01  6:39 ` string match -> new option Patrick Schaaf
2003-03-01 15:47   ` Michael Rash
2003-03-02  9:59   ` Harald Welte
2003-03-02 11:36     ` Patrick Schaaf

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