# Protection Mechanism Failure (CWE-693)

The product does not use or incorrectly uses a protection mechanism that provides sufficient defense against directed attacks against the product.

**Stack:** JavaScript

- Prevalence: 高 频繁被利用
- Impact: 高 1 条严重级别为高的规则
- Prevention: 已记录 8 个修复示例

**OWASP:** Security Misconfiguration (A05:2021-Security Misconfiguration) - #5

## Description

This weakness covers three distinct situations: Missing a protection mechanism, using a faulty protection mechanism, or incorrectly applying a protection mechanism. A missing protection mechanism occurs when the application does not defend against a specific attack. A faulty protection mechanism occurs when the application does defend against a specific attack, but the protection mechanism is not implemented correctly.

## Prevention

基于 1 条 Shoulder 检测规则的 Protection Mechanism Failure 预防策略。

### JavaScript

Add Helmet middleware to set security headers automatically

## Warning Signs

- [HIGH] Application lacks security headers middleware (helmet, CSP, HSTS, X-Frame-Options, etc.).
Without these headers, the app
- [HIGH] missing security headers middleware (Helmet) to prevent XSS, clickjacking, and MIME sniffing

## Consequences

- 绕过保护机制
- 执行未授权代码
- 获取权限

## Mitigations

- 实施多层防御(纵深防御)
- 采用业界标准且经过测试的安全机制,而非自行实现
- 确保保护机制无法被绕过或禁用

## Detection

- Total rules: 8
- Languages: dockerfile, go, javascript, typescript

## Rules by Language

### Javascript (1 rules)

- **Security Headers in Express.js** [HIGH]: Detects missing security headers middleware (Helmet) to prevent XSS, clickjacking, and MIME sniffing.
  - Remediation: Install and configure helmet middleware:

1. Install: npm install helmet
2. Import: const helmet = require('helmet');
3. Enable: app.use(helmet());

Example:
  const express = require('express');
  const helmet = require('helmet');
  const app = express();
  app.use(helmet());

### Typescript (1 rules)

- **Security Headers in Express.js** [HIGH]: Detects missing security headers middleware (Helmet) to prevent XSS, clickjacking, and MIME sniffing.
  - Remediation: Install and configure helmet middleware:

1. Install: npm install helmet
2. Import: const helmet = require('helmet');
3. Enable: app.use(helmet());

Example:
  const express = require('express');
  const helmet = require('helmet');
  const app = express();
  app.use(helmet());