Full Disclosure mailing list archives

Re: Microsoft takes 7 years to 'solve' a problem?!


From: Paul Schmehl <pschmehl () tx rr com>
Date: Tue, 25 Nov 2008 12:17:56 -0600

--On Tuesday, November 25, 2008 03:11:01 -0600 Valdis.Kletnieks () vt edu wrote:

That, plus Russ didn't even bother to read the fine article:

"And to be clear, the impact would have been to render many (or nearly all)
customers' network-based applications then inoperable. For instance, an
Outlook
2000 client wouldn't have been able to communicate with an Exchange 2000
server.

I know the users Russ supports - we'd have needed a body bag for him if
he had chosen that route rather than "not cause a significant impact".

This wasn't a buffer overflow, the problem was that the NTLM protocol was
screwed up by design - and fixing a protocol bug is usually a *lot* more
painful.  If you read between the lines of the article, it appears that MS
added support for a fixed protocol back in XP SP2, and has decided that the
number of pre-SP2 systems out there talking to updated systems has grown small
enough that it's finally practical to flip the switch.  That's pretty much the
only way to change a protocol without a flag-day cutover - ship dual-stack
during a transition, and then flip the switch when few enough old-style
machines are left.

Let's face it - the number of systems that have gotten compromised via
SMBRelay attacks is *far* smaller than the number of boxes pwned just
because they have IE installed and a user at the keyboard. The number of
systems pwned via SMBRelay is *also* a lot smaller than the number of
boxes that would have broken if Microsoft had "fixed" things the way Russ
apparently wanted them to.

Weird.  We were the ones that reported this issue to Microsoft back in 1998 or 
9 (don't recall exactly when now) or at least a part of the issue.  Very 
strange to see it pop up after all these years.  Of course they essentially 
told us the same thing that you describe - can't break everything to fix that 
one thing - wait for the next release.

And you're right - it wasn't a great risk unless you were already in the 
network in a serious way.

-- 
Paul Schmehl
pschmehl () tx rr com

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