Shawn wrote:
> Hmm, I have a vague recollection of Davide release a quick=20
> fix like less
> then 12 hours after a regular release -- I figured it was him=20
> that found
> a fixed the issues -- still 2 in how many years? How many other mail
> vendors can say the same :-D
>=20

qmail & postfix.. atleast for remote exploits.. not sendmail, exchange, =
notes, groupwise and others I guess.

That xmail has not had many vulnerabilities the last few years doesn't =
mean that xmail is flawless. Just look to apache httpd. Or sshd. Or the =
OpenSSL lib. These were living for quite a few years without remote =
exploits.

I wish I could change the greeting banner in order to let potential =
hackers know as little about my systems as possible. It's possible to =
fool nmap's os detection and I guess most hackers move on to the next =
system if they can't figure out much about your systems.

Why do you think we get regular scans for bind versions? Also in bind =
you can return bogus versions here without loosing functionality.=20

Also it wouldn't break anything (else than not being RFC compliant) by =
changing the banner. All extended mail options are still available =
through ehlo.

Quite a few programs let you alter greeting messages. Usually not with =
commercial software, but enterprise firewalls can also do that. Pix for =
instance automaticly filters out any such responses from the mailserver =
(inserts 'X's in place for the message) while some others have built in =
smtp secure proxies (Checkpoint/Raptor).

So I'd say it's quite an accepted thing to do this and you're actually =
gaining something from it too. I also can imagine it wouldn't be the =
hardest thing on earth to implement such a feature.

Lars
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