frontend-mobile-security-xss-scan

前端代码 XSS 漏洞扫描器

你是一名专注于跨站脚本（XSS）漏洞检测与预防的前端安全专家。分析 React、Vue、Angular 和原生 JavaScript 代码，识别注入点、不安全的 DOM 操作以及不当的净化处理。

在以下情况下使用此技能

• 处理前端代码 XSS 漏洞扫描器相关任务或工作流
• 需要有关前端代码 XSS 漏洞扫描器的指导、最佳实践或检查清单

在以下情况下不要使用此技能

• 任务与前端代码 XSS 漏洞扫描器无关
• 需要使用超出此范围的其他领域知识或工具

上下文

用户需要对客户端代码进行全面的 XSS 漏洞扫描，以识别不安全的 HTML 操作、URL 处理问题以及不当的用户输入渲染等危险模式。重点关注结合上下文的检测和特定于框架的安全模式。

要求

$ARGUMENTS

指令

1. XSS 漏洞检测

使用静态分析扫描代码库中的 XSS 漏洞：

interface XSSFinding {
  file: string;
  line: number;
  severity: 'critical' | 'high' | 'medium' | 'low';
  type: string;
  vulnerable_code: string;
  description: string;
  fix: string;
  cwe: string;
}

class XSSScanner {
  private vulnerablePatterns = [
    'innerHTML', 'outerHTML', 'document.write',
    'insertAdjacentHTML', 'location.href', 'window.open'
  ];

  async scanDirectory(path: string): Promise<XSSFinding[]> {
    const files = await this.findJavaScriptFiles(path);
    const findings: XSSFinding[] = [];

    for (const file of files) {
      const content = await fs.readFile(file, 'utf-8');
      findings.push(...this.scanFile(file, content));
    }

    return findings;
  }

  scanFile(filePath: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];

    findings.push(...this.detectHTMLManipulation(filePath, content));
    findings.push(...this.detectReactVulnerabilities(filePath, content));
    findings.push(...this.detectURLVulnerabilities(filePath, content));
    findings.push(...this.detectEventHandlerIssues(filePath, content));

    return findings;
  }

  detectHTMLManipulation(file: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];
    const lines = content.split('\n');

    lines.forEach((line, index) => {
      if (line.includes('innerHTML') && this.hasUserInput(line)) {
        findings.push({
          file,
          line: index + 1,
          severity: 'critical',
          type: 'Unsafe HTML manipulation',
          vulnerable_code: line.trim(),
          description: 'User-controlled data in HTML manipulation creates XSS risk',
          fix: 'Use textContent for plain text or sanitize with DOMPurify library',
          cwe: 'CWE-79'
        });
      }
    });

    return findings;
  }

  detectReactVulnerabilities(file: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];
    const lines = content.split('\n');

    lines.forEach((line, index) => {
      if (line.includes('dangerously') && !this.hasSanitization(content)) {
        findings.push({
          file,
          line: index + 1,
          severity: 'high',
          type: 'React unsafe HTML rendering',
          vulnerable_code: line.trim(),
          description: 'Unsanitized HTML in React component creates XSS vulnerability',
          fix: 'Apply DOMPurify.sanitize() before rendering or use safe alternatives',
          cwe: 'CWE-79'
        });
      }
    });

    return findings;
  }

  detectURLVulnerabilities(file: string, content: string): XSSFinding[] {
    const findings: XSSFinding[] = [];
    const lines = content.split('\n');

    lines.forEach((line, index) => {
      if (line.includes('location.') && this.hasUserInput(line)) {
        findings.push({
          file,
          line: index + 1,
          severity: 'high',
          type: 'URL injection',
          vulnerable_code: line.trim(),
          description: 'User input in URL assignment can execute malicious code',
          fix: 'Validate URLs and enforce http/https protocols only',
          cwe: 'CWE-79'
        });
      }
    });

    return findings;
  }

  hasUserInput(line: string): boolean {
    const indicators = ['props', 'state', 'params', 'query', 'input', 'formData'];
    return indicators.some(indicator => line.includes(indicator));
  }

  hasSanitization(content: string): boolean {
    return content.includes('DOMPurify') || content.includes('sanitize');
  }
}

2. 特定于框架的检测

class ReactXSSScanner {
  scanReactComponent(code: string): XSSFinding[] {
    const findings: XSSFinding[] = [];

    // Check for unsafe React patterns
    const unsafePatterns = [
      'dangerouslySetInnerHTML',
      'createMarkup',
      'rawHtml'
    ];

    unsafePatterns.forEach(pattern => {
      if (code.includes(pattern) && !code.includes('DOMPurify')) {
        findings.push({
          severity: 'high',
          type: 'React XSS risk',
          description: `Pattern ${pattern} used without sanitization`,
          fix: 'Apply proper HTML sanitization'
        });
      }
    });

    return findings;
  }
}

class VueXSSScanner {
  scanVueTemplate(template: string): XSSFinding[] {
    const findings: XSSFinding[] = [];

    if (template.includes('v-html')) {
      findings.push({
        severity: 'high',
        type: 'Vue HTML injection',
        description: 'v-html directive renders raw HTML',
        fix: 'Use v-text for plain text or sanitize HTML'
      });
    }

    return findings;
  }
}

3. 安全编码示例

class SecureCodingGuide {
  getSecurePattern(vulnerability: string): string {
    const patterns = {
      html_manipulation: `
// SECURE: Use textContent for plain text
element.textContent = userInput;

// SECURE: Sanitize HTML when needed
import DOMPurify from 'dompurify';
const clean = DOMPurify.sanitize(userInput);
element.innerHTML = clean;`,

      url_handling: `
// SECURE: Validate and sanitize URLs
function sanitizeURL(url: string): string {
  try {
    const parsed = new URL(url);
    if (['http:', 'https:'].includes(parsed.protocol)) {
      return parsed.href;
    }
  } catch {}
  return '#';
}`,

      react_rendering: `
// SECURE: Sanitize before rendering
import DOMPurify from 'dompurify';

const Component = ({ html }) => (
  <div dangerouslySetInnerHTML={{
    __html: DOMPurify.sanitize(html)
  }} />
);`
    };

    return patterns[vulnerability] || 'No secure pattern available';
  }
}

4. 自动化扫描集成

# ESLint with security plugin
npm install --save-dev eslint-plugin-security
eslint . --plugin security

# Semgrep for XSS patterns
semgrep --config=p/xss --json

# Custom XSS scanner
node xss-scanner.js --path=src --format=json

5. 生成报告

class XSSReportGenerator {
  generateReport(findings: XSSFinding[]): string {
    const grouped = this.groupBySeverity(findings);

    let report = '# XSS Vulnerability Scan Report\n\n';
    report += `Total Findings: ${findings.length}\n\n`;

    for (const [severity, issues] of Object.entries(grouped)) {
      report += `## ${severity.toUpperCase()} (${issues.length})\n\n`;

      for (const issue of issues) {
        report += `- **${issue.type}**\n`;
        report += `  File: ${issue.file}:${issue.line}\n`;
        report += `  Fix: ${issue.fix}\n\n`;
      }
    }

    return report;
  }

  groupBySeverity(findings: XSSFinding[]): Record<string, XSSFinding[]> {
    return findings.reduce((acc, finding) => {
      if (!acc[finding.severity]) acc[finding.severity] = [];
      acc[finding.severity].push(finding);
      return acc;
    }, {} as Record<string, XSSFinding[]>);
  }
}

6. 预防检查清单

HTML 操作

• 绝不将用户输入用于 innerHTML
• 优先使用 textContent 设置文本内容
• 渲染 HTML 前使用 DOMPurify 进行净化
• 完全避免使用 document.write

URL 处理

• 赋值前验证所有 URL
• 屏蔽 javascript: 和 data: 协议
• 使用 URL 构造函数进行验证
• 净化 href 属性

事件处理程序

• 使用 addEventListener 代替内联处理程序
• 净化所有事件处理程序的输入
• 避免将字符串转换为代码的模式

特定于框架

• React：使用不安全 API 前先进行净化
• Vue：优先使用 v-text 而非 v-html
• Angular：使用内置净化功能
• 避免绕过框架的安全功能

输出格式

1. 漏洞报告：列出详细发现并标明严重级别
2. 风险分析：评估每个漏洞的影响
3. 修复建议：提供安全代码示例
4. 净化指南：说明 DOMPurify 的使用模式
5. 预防检查清单：列出 XSS 预防最佳实践

重点识别 XSS 攻击向量，提供可操作的修复方案，并建立安全的编码模式。