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Ghost CMS <=4.32 - Cross-Site Scripting

ID: CVE-2021-29484

Severity: medium

Author: rootxharsh,iamnoooob

Tags: cve2021,cve,xss,ghost,node.js

Description

Section titled “Description”

Ghost CMS 4.0.0 to 4.3.2 contains a DOM cross-site scripting vulnerability. An unused endpoint added during the development of 4.0.0 allows attackers to gain access by getting logged-in users to click a link containing malicious code.

YAML Source

Section titled “YAML Source”
id: CVE-2021-29484


info:
  name: Ghost CMS <=4.32 - Cross-Site Scripting
  author: rootxharsh,iamnoooob
  severity: medium
  description: Ghost CMS 4.0.0 to 4.3.2 contains a DOM cross-site scripting vulnerability. An unused endpoint added during the development of 4.0.0 allows attackers to gain access by getting logged-in users to click a link containing malicious code.
  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 data theft, session hijacking, or defacement of the affected website.
  remediation: This issue has been fixed in 4.3.3.
  reference:
    - https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrg
    - https://www.npmjs.com/package/ghost
    - https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290
    - https://nvd.nist.gov/vuln/detail/CVE-2021-29484
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/TryGhost/Ghost/blob/95651b33a66f3240535a61999b292a725f1b3317/core/server/web/admin/views/preview.html
    - https://www.sonarsource.com/blog/ghost-admin-takeover/
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
    cvss-score: 6.8
    cve-id: CVE-2021-29484
    cwe-id: CWE-79
    epss-score: 0.01483
    epss-percentile: 0.86785
    cpe: cpe:2.3:a:ghost:ghost:*:*:*:*:*:node.js:*:*
  metadata:
    max-request: 1
    vendor: ghost
    product: ghost
    framework: node.js
    shodan-query: http.component:"ghost"
  tags: cve2021,cve,xss,ghost,node.js


http:
  - method: GET
    path:
      - "{{BaseURL}}/ghost/preview"


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'XMLHttpRequest.prototype.open = XMLHttpRequest.prototype.send'
          - 'top.postMessage('
        condition: and


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


      - type: status
        status:
          - 200
# digest: 4a0a00473045022073bd8c536fae1a224d898fff3bba67f1625807b60a9984bcd9b9951cbfd0e522022100b484a301edbc8ab4e2925a21137dabaf930d482ffa8421cb80e374de682f7e08:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-29484.yaml"

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