🛡️ Sentinel: [CRITICAL] Fix insecure Math.random() usage for sensitive identifiers#20
🛡️ Sentinel: [CRITICAL] Fix insecure Math.random() usage for sensitive identifiers#20
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…e identifiers
**Severity:** CRITICAL
**Vulnerability:** Several utility functions generated sensitive identifiers (`generateId`, `generateInviteCode`, device IDs) or secure random bytes using insecure `Math.random()`. `Math.random()` generates deterministic, predictable output and is not cryptographically secure, making those identifiers easily guessable.
**Impact:** Attackers could guess or predict sensitive invite codes, generated UUIDs, or device IDs leading to unauthorized access, impersonation, or bypassed security logic depending on their consumption context.
**Fix:** Removed insecure `Math.random()` fallbacks. Replaced them with secure `globalThis.crypto.getRandomValues()` (Web Crypto API) prioritizing standard environments, and `require('crypto').randomBytes` for explicit Node.js fallback. Explicitly throw an error if no secure RNG is found to fail securely.
**Verification:** Run `npm run test` and `bun run build`.
Added a learning log entry to `.jules/sentinel.md` as required.
Co-authored-by: bobdivx <6737167+bobdivx@users.noreply.github.com>
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Summary of ChangesHello, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request implements a critical security fix to prevent the generation of easily guessable sensitive identifiers. It replaces all instances of Highlights
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Code Review
This pull request effectively addresses a critical security vulnerability by replacing the insecure Math.random() with cryptographically secure alternatives for generating sensitive identifiers. The implementation correctly prioritizes the Web Crypto API and provides a fallback to the Node.js crypto module, with a fail-secure mechanism that throws an error if no secure random number generator is available. My review includes suggestions to improve maintainability by removing duplicated code and to make the error handling more robust.
| } catch { | ||
| // ignore | ||
| } |
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The empty catch block on lines 27-29 swallows any error that might occur within the try block. While this is intended to handle cases where the crypto module can't be required in a browser environment, it will also suppress other potential errors, such as an issue within randomBytes itself. This can make debugging more difficult as the original error context is lost, and the function will fall through to throw a generic error. It's better to inspect the error and only ignore the expected MODULE_NOT_FOUND error.
} catch (err) {
// In non-Node.js environments, `require` will throw. This is expected and can be ignored.
// We re-throw other unexpected errors to make debugging easier.
if (err.code !== 'MODULE_NOT_FOUND') {
throw err;
}
}| function getRandomBytes(size: number): Uint8Array { | ||
| // Utiliser Web Crypto API (compatible Tauri) | ||
| if (typeof window !== 'undefined' && window.crypto && window.crypto.getRandomValues) { | ||
| // Prioritize globalThis.crypto (Web Crypto API) | ||
| if (typeof globalThis !== 'undefined' && globalThis.crypto && globalThis.crypto.getRandomValues) { | ||
| const array = new Uint8Array(size); | ||
| window.crypto.getRandomValues(array); | ||
| globalThis.crypto.getRandomValues(array); | ||
| return array; | ||
| } | ||
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| // Verify typeof crypto !== 'undefined' for SSR | ||
| if (typeof crypto !== 'undefined' && crypto.getRandomValues) { | ||
| const array = new Uint8Array(size); | ||
| crypto.getRandomValues(array); | ||
| return array; | ||
| } | ||
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| // Fallback sur crypto Node.js (routes API uniquement) | ||
| if (typeof process !== 'undefined' && process.versions?.node) { | ||
| try { | ||
| const crypto = require('crypto'); | ||
| return crypto.randomBytes(size); | ||
| const nodeCrypto = require('crypto'); | ||
| return nodeCrypto.randomBytes(size); | ||
| } catch { | ||
| // Si crypto n'est pas disponible, utiliser Math.random | ||
| // ignore | ||
| } | ||
| } | ||
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| // Fallback ultime : générer des valeurs pseudo-aléatoires | ||
| const array = new Uint8Array(size); | ||
| for (let i = 0; i < size; i++) { | ||
| array[i] = Math.floor(Math.random() * 256); | ||
| } | ||
| return array; | ||
| // Throw an error instead of using insecure Math.random() | ||
| throw new Error('No secure random number generator available.'); | ||
| } |
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This getRandomBytes function is identical to the randomBytes function in src/lib/stubs/node-crypto.ts. To avoid code duplication and improve maintainability, consider removing this local implementation and importing the function from ../stubs/node-crypto.ts. This ensures that any future changes to the random byte generation logic only need to be made in one place.
You could replace this entire function with the following import at the top of the file:
import { randomBytes as getRandomBytes } from '../stubs/node-crypto';1 participant
🛡️ Sentinel: [CRITICAL] Fix insecure Math.random() usage for sensitive identifiers
Severity: CRITICAL
Vulnerability: Several utility functions generated sensitive identifiers (
generateId,generateInviteCode, device IDs) or secure random bytes using insecureMath.random().Math.random()generates deterministic, predictable output and is not cryptographically secure, making those identifiers easily guessable.Impact: Attackers could guess or predict sensitive invite codes, generated UUIDs, or device IDs leading to unauthorized access, impersonation, or bypassed security logic depending on their consumption context.
Fix: Removed insecure
Math.random()fallbacks. Replaced them with secureglobalThis.crypto.getRandomValues()(Web Crypto API) prioritizing standard environments, andrequire('crypto').randomBytesfor explicit Node.js fallback. Explicitly throw an error if no secure RNG is found to fail securely.Verification: Run
npm run testandbun run build.Added a learning log entry to
.jules/sentinel.mdas required.PR created automatically by Jules for task 9058229702253550327 started by @bobdivx