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Re: SMTP Relay and PIX

Subject: Re: SMTP Relay and PIX
Date: Wed, 18 Aug 2004 12:34:09 +0200
On Tue, Aug 17, 2004 at 09:34:15AM -0400, Kidder, Roy wrote:

The PIX can mask the "220" greeting from a mail server so that the vendor
and version of the mail system cannot be seen "plain text". This is called
"smtp fix-up". At best, this is security by obscurity though.

IIRC it also disables some dangerous commands like VRFY and EXPAND,
doesn't it? 

However, it's true that replacing [!02 ] characters with * in SMTP
greetings is not enough to hide software identity and it rather
discloses PIX itself ;-)

Martin Mačok
IT Security Consultant

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