[Dshield] Any legitimate reaason to strip SMTP X- headers?
pmarsh at nmefdn.org
Tue May 24 15:48:19 GMT 2005
Thanks, that's some good information. Are there any best
practices that you can point out regarding this subject?
Should be gone now >>>>> X-MimeOLE: Produced By Microsoft Exchange
From: list-bounces at lists.dshield.org
[mailto:list-bounces at lists.dshield.org] On Behalf Of Jeff Kell
Sent: Tuesday, May 24, 2005 11:26 AM
To: General DShield Discussion List
Subject: Re: [Dshield] Any legitimate reaason to strip SMTP X- headers?
Paul Marsh wrote:
> Really good question I've got a Firebox that does the same thing in
> it's default proxy config. Anyone have any ideas?
You strip X-headers for the same reason you would strip/obfuscate
banners and other "identifying" information. If there's an exploit
discovered for specific builds of Exchange (for example), and I see from
your mail that you are running:
> X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0
Then kaboom, you're making it easy for the black hats. Especially if
these headers get logged somewhere, and perhaps google indexed, etc.
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