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33 lines
942 B
YAML
33 lines
942 B
YAML
title: CVE-2021-33766 Exchange ProxyToken Exploitation
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id: 56973b50-3382-4b56-bdf5-f51a3183797a
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status: experimental
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description: Detects the exploitation of Microsoft Exchange ProxyToken vulnerability as described in CVE-2021-33766
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author: Florian Roth, Max Altgelt, Christian Burkard
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date: 2021/08/30
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references:
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- https://www.zerodayinitiative.com/blog/2021/8/30/proxytoken-an-authentication-bypass-in-microsoft-exchange-server
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tags:
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- attack.initial_access
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- attack.t1190
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logsource:
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category: webserver
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detection:
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selection1:
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cs-method: 'POST'
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c-uri|contains|all:
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- '/ecp/'
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- '/RulesEditor/InboxRules.svc/NewObject'
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sc-status: 500
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selection2:
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c-uri|contains|all:
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- 'SecurityToken='
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- '/ecp/'
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sc-status: 500
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condition: selection1 or selection2
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fields:
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- c-ip
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- c-dns
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falsepositives:
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- Unknown
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level: critical
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