CVE-2021-38647 일명 'OMIGOD'

CVE-2021-38647 (일명 OMIGOD) 익스플로잇 시도를 탐지하는 Zeek 패키지입니다.

https://corelight.com/blog/detecting-cve-2021-38647-omigod
https://www.wiz.io/blog/omigod-critical-vulnerabilities-in-omi-azure
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-38647

익스플로잇

익스플로잇은 단순히 Authorization 헤더를 생략하는 것입니다. 아래 그림은 요약입니다.
익스플로잇 요약

설치

라이브 환경에서 Zeek 패키지로 설치
zkg install corelight/CVE-2021-38647 또는 직접 URL 사용.
zkg install https://github.com/corelight/CVE-2021-38647/

이미 가지고 있는 pcap 파일에 대해 사용
zeek -Cr scripts/__load__.zeek your.pcap

옵션 및 참고 사항:

이 패키지는 클러스터 환경 및 비클러스터 환경에서 모두 실행됩니다.

#separator \x09 #set_separator , #empty_field (empty) #unset_field - #path notice #open 2021-09-20-14-23-48 #fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p fuid file_mime_type file_desc proto note msg sub src dst p n peer_descr actions suppress_for remote_location.country_code remote_location.region remote_location.city remote_location.latitude remote_location.longitude #types time string addr port addr port string string string enum enum string string addr addr port count string set[enum] interval string string string double double 1631859866.672356 CUoF9i1epohx0Xkycj 127.0.0.1 57592 127.0.0.1 5985 - - - tcp CVE_2021_38647::EXPLOIT_REQUEST A REQUEST to an OMI/WMI uri has a missing Authorization header - this is possibly a CVE-2021-38647 (AKA OMIGOD) exploit. See sub of this notice field for the raw Request data. Refer to https://www.wiz.io/blog/secret-agent-exposes-azure-customers-to-unauthorized-code-execution The first 10000 bytes of data = '<?xml version="1.0"?><s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:n="http://schemas.xmlsoap.org/ws/2004/09/enumeration" xmlns:w="http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema" xmlns:h="http://schemas.microsoft.com/wbem/wsman/1/windows/shell" xmlns:p="http://schemas.microsoft.com/wbem/wsman/1/wsman.xsd">\x09 <s:Header>\x09\x09 <a:To>HTTP://127.0.0.1:5985/wsman/</a:To>\x09\x09 <w:ResourceURI s:mustUnderstand="true">http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem</w:ResourceURI>\x09\x09\x09 <a:ReplyTo>\x09\x09\x09\x09 <a:Address s:mustUnderstand="true">http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</a:Address>\x09\x09\x09\x09\x09 </a:ReplyTo>\x09\x09\x09\x09\x09\x09 <a:Action>http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem/ExecuteScript</a:Action>\x09\x09\x09\x09\x09\x09 <w:MaxEnvelopeSize s:mustUnderstand="true">102400</w:MaxEnvelopeSize>\x09\x09\x09\x09\x09\x09\x09 <a:MessageID>uuid:00B60932-CC01-0005-0000-313370010000</a:MessageID>\x09\x09\x09\x09\x09\x09\x09 <w:OperationTimeout>PT1M30S</w:OperationTimeout>\x09\x09\x09\x09\x09\x09\x09\x09 <w:Locale xml:lang="en-us" s:mustUnderstand="false"/>\x09\x09\x09\x09\x09\x09\x09\x09 <p:DataLocale xml:lang="en-us" s:mustUnderstand="false"/>\x09\x09\x09\x09\x09\x09\x09\x09\x09 <w:OptionSet s:mustUnderstand="true"/>\x09\x09\x09\x09\x09\x09\x09\x09\x09 <w:SelectorSet>\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09 <w:Selector Name="__cimnamespace">root/scx</w:Selector>\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09 </w:SelectorSet>\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09\x09 </s:Header>\x09\x09\x09' 127.0.0.1 127.0.0.1 5985 - - Notice::ACTION_LOG 3600.000000 - - - - -```

#separator \x09 #set_separator , #empty_field (empty) #unset_field - #path notice #open 2021-09-20-14-23-48 #fields ts uid id.orig_h id.orig_p id.resp_h id.resp_p fuid file_mime_type file_desc proto note msg sub src dst p n peer_descr actions suppress_for remote_location.country_code remote_location.region remote_location.city remote_location.latitude remote_location.longitude #types time string addr port addr port string string string enum enum string string addr addr port count string set[enum] interval string string string double double 1631859866.680111 CUoF9i1epohx0Xkycj 127.0.0.1 57592 127.0.0.1 5985 - - - tcp CVE_2021_38647::EXPLOIT_RESPONSE A Server RESPONSE has been sent following a request to an OMI/WMI uri with a missing Authorization header - this is possibly a successful CVE-2021-38647 (AKA OMIGOD) exploit. See sub of this notice field for the raw Request data. Refer to https://www.wiz.io/blog/secret-agent-exposes-azure-customers-to-unauthorized-code-execution The first 10000 bytes of data = '<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://www.w3.org/2003/05/soap-envelope" xmlns:wsa="http://schemas.xmlsoap.org/ws/2004/08/addressing" xmlns:wsen="http://schemas.xmlsoap.org/ws/2004/09/enumeration" xmlns:e="http://schemas.xmlsoap.org/ws/2004/08/eventing" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:wsmb="http://schemas.dmtf.org/wbem/wsman/1/cimbinding.xsd" xmlns:wsman="http://schemas.dmtf.org/wbem/wsman/1/wsman.xsd" xmlns:wxf="http://schemas.xmlsoap.org/ws/2004/09/transfer" xmlns:cim="http://schemas.dmtf.org/wbem/wscim/1/common" xmlns:msftwinrm="http://schemas.microsoft.com/wbem/wsman/1/wsman.xsd" xmlns:wsmid="http://schemas.dmtf.org/wbem/wsman/identity/1/wsmanidentity.xsd"><SOAP-ENV:Header><wsa:To>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</wsa:To><wsa:Action>http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem/ExecuteScript</wsa:Action><wsa:MessageID>uuid:04F232DD-CC2A-0005-0000-000000210000</wsa:MessageID><wsa:RelatesTo>uuid:00B60932-CC01-0005-0000-313370010000</wsa:RelatesTo></SOAP-ENV:Header><SOAP-ENV:Body><p:SCX_OperatingSystem_OUTPUT xmlns:p="http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem"><p:ReturnValue>TRUE</p:ReturnValue><p:ReturnCode>0</p:ReturnCode><p:StdOut>OMIGOD it works!
uid=0(root) gid=0(root) groups=0(root)
Linux
Fri Sep 17 06:24:26 UTC 2021
Goodbye
</p:StdOut><p:StdErr></p:StdErr></p:SCX_OperatingSystem_OUTPUT></SOAP-ENV:Body></SOAP-ENV:Envelope>' 127.0.0.1 127.0.0.1 5985 - - Notice::ACTION_LOG 3600.000000 - - - - -

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