Date: Wed, 28 Nov 2007 21:44:40 -0800
From: "Daniel H. Renner" <dan@...angelescomputerhelp.com>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Microsoft FTP Client Multiple

 From what I've noticed, users of MS' FTP client aren't the usual 
Windows GUI user.  So that would be one good social engineering trick...


Original Message:
------------------------------------------------
 > Date: Wed, 28 Nov 2007 18:34:47 -0500
 > From: "Peter Dawson" <slash.pd@...il.com>
 > Subject: Re: [Full-disclosure] Microsoft FTP Client Multiple
 > 	Bufferoverflow	Vulnerability
 > To: "Stan Bubrouski" <stan.bubrouski@...il.com>
 > Cc: full-disclosure@...ts.grok.org.uk
 > Message-ID:
 > 	<8f1f7b60711281534p554ccdb1mea0fd20826625658@...l.gmail.com>
 > Content-Type: text/plain; charset="utf-8"
 >
 > Yeah ..
 >
 > a) "Social engineer victim to open it."
 > b) "Persuade victim to run the command "
 >
 > is kind funky..
 >
 > On Nov 28, 2007 5:21 PM, Stan Bubrouski <stan.bubrouski@...il.com> wrote:
 >
 > > Not to mention the obvious fact that if you have to trick someone into
 > > running a batch file then you could probably just tell the genius to
 > > execute a special EXE you crafted for them.
 > >
 > > -sb
 > >
 > > On Nov 28, 2007 4:43 PM, dev code <devcode29@...mail.com> wrote:
 >> > >
 >> > >  lolerowned, kinda like the 20 other non exploitable stack overflow
 >> > > exceptions that someone else has been reporting on full disclosure
 >> > > ________________________________
 >> > > Date: Wed, 28 Nov 2007 09:11:30 -0600
 >> > > From: reepex@...il.com
 >> > > To: rajesh.sethumadhavan@...oo.com; 
full-disclosure@...ts.grok.org.uk
 >> > > Subject: Re: [Full-disclosure] Microsoft FTP Client Multiple
 > > Bufferoverflow
 >> > > Vulnerability
 >> > >
 >> > >
 >> > >
 >> > > so... what fuzzer that you didnt code did you use to find these 
amazing
 >> > > vulns?
 >> > >
 >> > > Also nice 'payload'  in your exploits meaning 'nice long lists 
of "a"s'.
 > > You
 >> > > should not claim code execution when your code does not perform it.
 >> > >
 >> > > Well I guess it has been good talking until your fuzzer crashes 
another
 >> > > application and you copy and paste the results
 >> > >
 >> > >
 >> > > On 11/28/07, Rajesh Sethumadhavan <rajesh.sethumadhavan@...oo.com>
 > > wrote:
 >> > > Microsoft FTP Client Multiple Bufferoverflow
 >> > > Vulnerability
 >> > >
 >> > > 
#####################################################################
 >> > >
 >> > > XDisclose Advisory      : XD100096
 >> > > Vulnerability Discovered: November 20th 2007
 >> > > Advisory Reported       : November 28th 2007
 >> > > Credit                  : Rajesh Sethumadhavan
 >> > >
 >> > > Class                   : Buffer Overflow
 >> > >                          Denial Of Service
 >> > > Solution Status         : Unpatched
 >> > > Vendor                  : Microsoft Corporation
 >> > > Affected applications   : Microsoft FTP Client
 >> > > Affected Platform       : Windows 2000 server
 >> > >                          Windows 2000 Professional
 >> > >                          Windows XP
 >> > >                          (Other Versions may be also effected)
 >> > >
 >> > > 
#####################################################################
 >> > >
 >> > >
 >> > > Overview:
 >> > > Bufferoverflow vulnerability is discovered in
 >> > > microsoft ftp client. Attackers can crash the ftp
 >> > > client of the victim user by tricking the user.
 >> > >
 >> > >
 >> > > Description:
 >> > > A remote attacker can craft packet with payload in the
 >> > > "mget", "ls", "dir", "username" and "password"
 >> > > commands as demonstrated below. When victim execute
 >> > > POC or specially crafted packets, ftp client will
 >> > > crash possible arbitrary code execution in contest of
 >> > > logged in user. This vulnerability is hard to exploit
 >> > > since it requires social engineering and shellcode has
 >> > > to be injected as argument in vulnerable commands.
 >> > >
 >> > > The vulnerability is caused due to an error in the
 >> > > Windows FTP client in validating commands like "mget",
 >> > > "dir", "user", password and "ls"
 >> > >
 >> > > Exploitation method:
 >> > >
 >> > > Method 1:
 >> > > -Send POC with payload to user.
 >> > > -Social engineer victim to open it.
 >> > >
 >> > > Method 2:
 >> > > -Attacker creates a directory with long folder or
 >> > > filename in his FTP server (should be other than IIS
 >> > > server)
 >> > > -Persuade victim to run the command "mget", "ls" or
 >> > > "dir"  on specially crafted folder using microsoft ftp
 >> > > client
 >> > > -FTP client will crash and payload will get executed
 >> > >
 >> > >
 >> > > Proof Of Concept:
 >> > > http://www.xdisclose.com/poc/mget.bat.txt
 >> > >  http://www.xdisclose.com/poc/username.bat.txt
 >> > > http://www.xdisclose.com/poc/directory.bat.txt
 >> > > http://www.xdisclose.com/poc/list.bat.txt
 >> > >
 >> > > Note: Modify POC to connect to lab FTP Server
 >> > >      (As of now it will connect to
 >> > > ftp://xdisclose.com)
 >> > >
 >> > > Demonstration:
 >> > > Note: Demonstration leads to crashing of Microsoft FTP
 >> > > Client
 >> > >
 >> > > Download POC rename to .bat file and execute anyone of
 >> > > the batch file
 >> > > http://www.xdisclose.com/poc/mget.bat.txt
 >> > >  http://www.xdisclose.com/poc/username.bat.txt
 >> > > http://www.xdisclose.com/poc/directory.bat.txt
 >> > > http://www.xdisclose.com/poc/list.bat.txt
 >> > >
 >> > >
 >> > > Solution:
 >> > > No Solution
 >> > >
 >> > > Screenshot:
 >> > > http://www.xdisclose.com/images/msftpbof.jpg
 >> > >
 >> > >
 >> > > Impact:
 >> > > Successful exploitation may allows execution of
 >> > > arbitrary code with privilege of currently logged in
 >> > > user.
 >> > >
 >> > > Impact of the vulnerability is system level.
 >> > >
 >> > >
 >> > > Original Advisory:
 >> > > http://www.xdisclose.com/advisory/XD100096.html
 >> > >
 >> > > Credits:
 >> > > Rajesh Sethumadhavan has been credited with the
 >> > > discovery of this vulnerability
 >> > >
 >> > >
 >> > > Disclaimer:
 >> > > This entire document is strictly for educational,
 >> > > testing and demonstrating purpose only. Modification
 >> > > use and/or publishing this information is entirely on
 >> > > your own risk. The exploit code/Proof Of Concept is to
 >> > > be used on test environment only. I am not liable for
 >> > > any direct or indirect damages caused as a result of
 >> > > using the information or demonstrations provided in
 >> > > any part of this advisory.
 >> > >
 >> > >
 >> > >
 >> > >
 >> > >
 > > 
____________________________________________________________________________________
 >> > > Never miss a thing.  Make Yahoo your home page.
 >> > > http://www.yahoo.com/r/hs
 >> > >
 >> > > _______________________________________________
 >> > > Full-Disclosure - We believe in it.
 >> > > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
 >> > > Hosted and sponsored by Secunia - http://secunia.com/
 >> > >
 >> > >
 >> > > ________________________________
 >> > > Connect and share in new ways with Windows Live. Connect now!
 >> > > _______________________________________________
 >> > > Full-Disclosure - We believe in it.
 >> > > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
 >> > > Hosted and sponsored by Secunia - http://secunia.com/
 >> > >
 > >
 > > _______________________________________________
 > > Full-Disclosure - We believe in it.
 > > Charter: http://lists.grok.org.uk/full-disclosure-charter.html
 > > Hosted and sponsored by Secunia - http://secunia.com/
 > >
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