# Weak Password Recovery Mechanism for Forgotten Password (CWE-640)

The product contains a mechanism for users to recover or change their passwords without knowing the original password, but the mechanism is weak.

**Stack:** JavaScript

- Prevalence: Hoch Häufig ausgenutzt
- Impact: Hoch 3 Regeln mit hohem Schweregrad
- Prevention: Dokumentiert 3 Fix-Beispiele

**OWASP:** Identification and Authentication Failures (A07:2021-Identification and Authentication Failures) - #7

## Description

Weak password recovery mechanisms can be exploited to take over user accounts. Common issues include predictable reset tokens, security questions with easily guessable answers, or lack of verification.

## Prevention

Präventionsstrategien für Weak Password Recovery basierend auf 1 Shoulder-Erkennungsregeln.

### JavaScript

Use crypto.randomBytes() instead of Math.random() for security tokens

## Warning Signs

- [HIGH] predictable random number generation (Math

## Consequences

- Privilegien erlangen
- Schutzmechanismus umgehen

## Mitigations

- Für Passwort-Reset-Links starke, zufällige Tokens verwenden
- Token-Ablauf umsetzen (z. B. 1 Stunde)
- Zusätzliche Verifizierung wie E-Mail oder SMS verlangen
- Reset-Token niemals in URLs offenlegen, die geloggt werden könnten

## Detection

- Total rules: 3
- Languages: go, javascript, typescript, python

## Rules by Language

### Javascript (1 rules)

- **Weak Password Reset Token** [HIGH]: Detects predictable random number generation (Math.random) used for password reset tokens.
  - Remediation: Use cryptographically secure random:

```javascript
const crypto = require('crypto');
const resetToken = crypto.randomBytes(32).toString('hex');
```

Learn more: https://shoulder.dev/learn/javascript/cwe-640/weak-password-reset-token

### Typescript (1 rules)

- **Weak Password Reset Token** [HIGH]: Detects predictable random number generation (Math.random) used for password reset tokens.
  - Remediation: Use cryptographically secure random:

```javascript
const crypto = require('crypto');
const resetToken = crypto.randomBytes(32).toString('hex');
```

Learn more: https://shoulder.dev/learn/javascript/cwe-640/weak-password-reset-token