CVE-2025-20769: MediaTek显示组件越界写入本地权限提升漏洞

# CVE-2025-20769 PoC - MediaTek Display Component Out of Bounds Write # This PoC demonstrates the vulnerability pattern (for educational purposes only) import os import sys def check_vulnerability(): """ Check if the system is vulnerable to CVE-2025-20769 Requires: MediaTek device with ALPS display component """ print("[*] CVE-2025-20769 Vulnerability Checker") print("[*] Target: MediaTek Display Component") print("[*] Vulnerability: Out of Bounds Write due to missing bounds check") # Check if running on MediaTek device try: with open('/proc/cpuinfo', 'r') as f: cpuinfo = f.read() if 'MediaTek' in cpuinfo or 'mt' in cpuinfo.lower(): print("[+] MediaTek chipset detected") else: print("[-] Non-MediaTek device - may not be affected") return False except: print("[-] Unable to read system information") return False # Check kernel version and patch status kernel_version = os.popen('uname -r').read().strip() print(f"[*] Kernel version: {kernel_version}") # Note: Actual exploitation requires: # 1. System-level privileges (PR:H required) # 2. Access to display driver ioctl interface # 3. Ability to craft malicious display buffer data print("\n[!] This is a LOCAL privilege escalation vulnerability") print("[!] Attacker must already have System privileges") print("[!] No user interaction required for exploitation") return None # Requires actual device testing def simulate_exploit(): """ Conceptual exploit structure for CVE-2025-20769 """ print("\n[*] Simulating exploit structure...") # Step 1: Obtain System privileges (prerequisite) print("[1] Prerequisites: System-level access obtained") # Step 2: Access display driver interface print("[2] Open display driver device: /dev/display") # Step 3: Craft malicious buffer with oversized data malicious_buffer = b'A' * 0x10000 # Exceed buffer boundary print(f"[3] Craft malicious buffer: {len(malicious_buffer)} bytes") # Step 4: Trigger out of bounds write via ioctl print("[4] Send crafted buffer to display driver ioctl") print("[*] Missing bounds check allows overflow") # Step 5: Achieve privilege escalation print("[5] Overwrite kernel structures to escalate privileges") print("[+] Exploitation successful - root access obtained") if __name__ == "__main__": check_vulnerability()