id: open-proxy-external

info:
  name: Open Proxy To External Network
  author: gtrrnr
  severity: medium
  description: The host is configured as a proxy which allows access to other hosts on the external network.
  remediation: Disable the proxy or restrict configuration to only allow access to approved hosts/ports.
  reference:
    - https://en.wikipedia.org/wiki/Open_proxy
    - https://www.acunetix.com/vulnerabilities/web/apache-configured-to-run-as-proxy/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
    cvss-score: 5.8
    cwe-id: CWE-441
  metadata:
    max-request: 3
  tags: exposure,config,proxy,misconfig,vuln

http:
  - raw:
      - |+
        GET https://test.s3.amazonaws.com HTTP/1.1
        Host: test.s3.amazonaws.com

      - |+
        GET http://{{interactsh-url}} HTTP/1.1
        Host: {{interactsh-url}}

      - |+
        GET / HTTP/1.1
        Host: {{Hostname}}

    unsafe: true

    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - contains_any(body_1, "<HostId>", "</HostId>")
          - contains(header_2, "X-Interactsh-Version")
        condition: and

      - type: dsl
        dsl:
          - '!contains(body_3, "<HostId>")'
          - '!contains(header_3, "X-Interactsh-Version")'
        condition: and
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