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| Subject: | Re: SMTP Relay and PIX |
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| 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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