bugtraq - RE: EEYE: Microsoft ASN.1 Library Length Overflow Heap Corruption

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Date: Tue, 10 Feb 2004 16:23:38 -0800 (PST)
From: Tina Bird <tbird@...cision-guesswork.com>
To: Rainer Gerhards <rgerhards@...adiscon.com>
Cc: Marc Maiffret <mmaiffret@...e.com>,
	Joe Blatz <sd_wireless@...oo.com>, BUGTRAQ@...urityfocus.com
Subject: RE: EEYE: Microsoft ASN.1 Library Length Overflow Heap Corruption

On Tue, 10 Feb 2004, Rainer Gerhards wrote:

> And that the server is more likely to be attacked is just an assumption
> - in the days of class A vuln sweeps and random worm scans, I don't
> think that servers are at most risk. In fact, I think the unprotected
> home machines are...
>
Yes, but...

In order to trigger the ASN.1 vulnerabilities an attacker has to be able
to get the target machine to invoke its BER decoding capabilities.  I
certainly don't know the details -- maybe someone here does? -- but it's
gotta be a little difficult to send a random network packet to get a
desktop machine (that is, not a domain controller or an AD server or
something) and get it to invoke MSASN1.

I can imagine lots of attacks that require user intervention to hit this
one (like opening a hostile SSL-based web site) -- but can this be
triggered without user intervention?

thanks for more info -- tbird