nuclei-templates/http/cves/2021/CVE-2021-34473.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: 0.97285
    epss-percentile: 0.99848
    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
    fofa-query: title="outlook"
    google-query: intitle:"outlook"
  tags: cve2021,cve,ssrf,rce,exchange,kev,microsoft

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: 4a0a00473045022100a05e71e316d5e5706b9faae16b076bdd8ba52969ad1a907f409494b8ceb0f3c002202f939aad5ecfa6df83bc6e2d8876dbc1895c9452ffe5d9adc04d4b8046ad467c:922c64590222798bb761d5b6d8e72950
add ProxyShell detection template 2021-08-10 07:59:06 +00:00			`id: CVE-2021-34473`

			`info:`
Dashboard Content Enhancements (#4289) Dashboard content enhancements. 2022-05-02 21:50:47 +00:00			`name: Exchange Server - Remote Code Execution`
minor update 2021-08-12 16:39:42 +00:00			`author: arcc,intx0x80,dwisiswant0,r3dg33k`
add ProxyShell detection template 2021-08-10 07:59:06 +00:00			`severity: critical`
			`description: \|`
Dashboard Content Enhancements (#4289) Dashboard content enhancements. 2022-05-02 21:50:47 +00:00			`Microsoft Exchange Server is vulnerable to a remote code execution vulnerability. This CVE ID is unique from CVE-2021-31196, CVE-2021-31206.`
Added Impact 2023-09-27 15:51:13 +00:00			`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.`
Updated 2021 CVEs 2023-09-06 12:09:01 +00:00			`remediation: Apply Microsoft Exchange Server 2019 Cumulative Update 9 or upgrade to the latest version.`
Removed pipe (\|) character from references, because the structure requires it to be a string slice, not a string Related nuclei tickets: * #259 - dynamic key-value field support for template information * #940 - new infos in template * #834 * RES-84 2021-08-19 13:59:12 +00:00			`reference:`
Satisfying the linter (all errors and warnings) * whitespace modifications only 2021-08-19 14:44:46 +00:00			`- 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`
Dashboard Content Enhancements (#4289) Dashboard content enhancements. 2022-05-02 21:50:47 +00:00			`- https://nvd.nist.gov/vuln/detail/CVE-2021-34473`
CVE Enrichment :tada: 2023-07-11 19:49:27 +00:00			`- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-34473`
Added cve annotations + severity adjustments 2021-09-10 11:26:40 +00:00			`classification:`
TemplateMan Update [Sun Jan 14 13:49:26 UTC 2024] :robot: 2024-01-14 13:49:27 +00:00			`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`
Added cve annotations + severity adjustments 2021-09-10 11:26:40 +00:00			`cve-id: CVE-2021-34473`
CVE Enrichment :tada: 2023-07-11 19:49:27 +00:00			`cwe-id: CWE-918`
TemplateMan Update [Sat Mar 23 09:28:19 UTC 2024] :robot: 2024-03-23 09:28:19 +00:00			`epss-score: 0.97285`
			`epss-percentile: 0.99848`
Updated 2021 CVEs 2023-09-06 12:09:01 +00:00			`cpe: cpe:2.3:a:microsoft:exchange_server:2013:cumulative_update_23::::::`
Added max request counter of each template 2023-04-28 08:11:21 +00:00			`metadata:`
			`max-request: 2`
CVE Enrichment :tada: 2023-07-11 19:49:27 +00:00			`vendor: microsoft`
			`product: exchange_server`
product/queries updated 2024-05-31 19:23:20 +00:00			`shodan-query: vuln:cve-2021-26855`
			`fofa-query: title="outlook"`
			`google-query: intitle:"outlook"`
auto tagging via templateman 2024-01-14 09:21:50 +00:00			`tags: cve2021,cve,ssrf,rce,exchange,kev,microsoft`
add ProxyShell detection template 2021-08-10 07:59:06 +00:00
Refactoring the directory structure based on protocols (#7137) * moving http templates * updated cves.json * moved network CVEs * updated scripts * updated workflows * updated requests to http * replaced network to tcp --------- Co-authored-by: sandeep <8293321+ehsandeep@users.noreply.github.com> 2023-04-27 04:28:59 +00:00			`http:`
add ProxyShell detection template 2021-08-10 07:59:06 +00:00			`- method: GET`
			`path:`
add second url for more stable detection 2021-08-10 08:17:37 +00:00			`- '{{BaseURL}}/autodiscover/autodiscover.json?@test.com/owa/?&Email=autodiscover/autodiscover.json%3F@test.com'`
follow redirect, compare body instead of status code, eliminate false positives 2021-08-10 08:53:58 +00:00			`- '{{BaseURL}}/autodiscover/autodiscover.json?@test.com/mapi/nspi/?&Email=autodiscover/autodiscover.json%3F@test.com'`
add ProxyShell detection template 2021-08-10 07:59:06 +00:00
			`matchers:`
follow redirect, compare body instead of status code, eliminate false positives 2021-08-10 08:53:58 +00:00			`- type: word`
			`part: body`
			`words:`
minor update 2021-08-12 16:39:42 +00:00			`- "Microsoft.Exchange.Clients.Owa2.Server.Core.OwaADUserNotFoundException"`
Dashboard Content Enhancements (#4289) Dashboard content enhancements. 2022-05-02 21:50:47 +00:00			`- "Exchange MAPI/HTTP Connectivity Endpoint"`
CVE Enrichment :tada: 2023-07-11 19:49:27 +00:00			`condition: or`
Auto Template Signing [Sat Jun 1 06:52:59 UTC 2024] :robot: 2024-06-01 06:53:00 +00:00			`# digest: 4a0a00473045022100a05e71e316d5e5706b9faae16b076bdd8ba52969ad1a907f409494b8ceb0f3c002202f939aad5ecfa6df83bc6e2d8876dbc1895c9452ffe5d9adc04d4b8046ad467c:922c64590222798bb761d5b6d8e72950`