bugtraq - Re: IRM 019: MailMarshal 6.1 SMTP MTA Content Filter Bypass

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Date: Fri, 09 Jun 2006 08:29:25 +0100
From: alberto <albertodiaz@...cali.co.uk>
To: bugtraq@...urityfocus.com
Subject: Re: IRM 019: MailMarshal 6.1 SMTP MTA Content Filter Bypass


Well I think the advisory was quite good, except for the missing reg 
file but that file can be find in the Mailmarshal website as they have 
put a knowledge base there.

It looks that Mailmarshal doesn't know that the ACE archive file is 
actually an archive file so it will not try to unpack it but because 
Mailmarshal recognises ACE files it won't be blocked by the unknow 
attachment rules.

In relation to encrypt zip files and the rest that won't work as Hayden 
said that if it can unpack the file it won't release the file.

Alberto

Hayden Searle wrote:
> I agree with the below. Besides the best way to setup MailMarshal is to
> set it to bin/error on anything it cant unpack (which it generally does
> anyway) as it should fault with an unpacking error. You should be able
> to set the system that if it cant scan/unpack/check any file or email
> that it holds it and does not send it on.
> 
> Any other configuration is reckless
> 
> Hayden
> 
> -----Original Message-----
> From: phil.mccracken@...chickswithglamourshots.com
> [mailto:phil.mccracken@...chickswithglamourshots.com] 
> Sent: Thursday, 8 June 2006 3:54 a.m.
> To: bugtraq@...urityfocus.com
> Subject: Re: IRM 019: MailMarshal 6.1 SMTP MTA Content Filter Bypass
> 
> This advisory is rather useless without the actual .reg file
> information. It's also rather asinine, since any content filter can be
> "bypassed" in this manner by simply encrypting a ZIP, RAR, or the
> archive of your choosing. This is the equivalent of saying "we have
> found a vulnerability in the Logitech wireless mouse, whereby if you
> double click to execute a malicious file, your system becomes infected.
> The vendor has advised us that we have a fundamental problem
> understanding how the internet and computers in general function. The
> workaround is to remove the batteries from the wireless mouse"
> 
> 
> 
> I'm quite disappointed in the recent lack of quality in Bugtraq's
> entries. Next we'll have end-users submitting bugs because their CDROM
> isn't a fully-functional coaster for their ale. 
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