full-disclosure - Re: Microsoft Internet Information Server ftpd zeroday

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Date: Wed, 02 Sep 2009 10:33:47 +0200
From: Guido Landi <lists@...mera.org>
To: Vladimir '3APA3A' Dubrovin <3APA3A@...URITY.NNOV.RU>
Cc: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com,
	Thierry Zoller <Thierry@...ler.lu>
Subject: Re: Microsoft Internet Information Server ftpd
 zeroday

no, MKDIR is *not* required, also write access is *not* required.

Assuming a directory with a name that starts with "A" exists and that is
at least 14 chars long, this pattern will trigger the overflow:

NLST [Ax206]*/../A*/../A*/../A*/../A*/../A*/../A*/../A*/\r\n

At least on win2k3. Therefore, the workarounds for kb975191 on
microsoft.com are wrong.

Guido Landi

Vladimir '3APA3A' Dubrovin wrote:
> Dear Thierry Zoller,
> 
> I   think   yes,   MKDIR   is   required.  It  should  be  variation  of
> S99-003/MS02-018.  fuzzer  should  be very smart to create directory and
> user  both  oversized buffer and ../ in NLST - it makes path longer than
> MAX_PATH with existing directory.
> 
> --Monday, August 31, 2009, 8:21:12 PM, you wrote to full-disclosure@...ts.grok.org.uk:
> 
> 
> TZ> Confirmed.
> 
> TZ> Ask  yourselves why your fuzzers haven't found that one - Combination of
> TZ> MKDIR are required before reaching vuln code ?
> 
> 
> 
> 
> 

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