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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTlmZ3gtcTI1aC1qeHJn
DOM XSS in Theme Preview
Impact
An unused endpoint added during the development of 4.0.0 has left sites vulnerable to untrusted users gaining access to Ghost Admin. Attackers can gain access by getting logged in users to click a link containing malicious code. Users do not need to enter credentials and may not know they've visited a malicious site.
Ghost(Pro) has already been patched. We can find no evidence that the issue was exploited on Ghost(Pro) prior to the patch being added.
Self-hosters are impacted if running Ghost a version between 4.0.0 and 4.3.2. Immediate action should be taken to secure your site - see patches & workarounds below.
Patches
Fixed in 4.3.3, all 4.x sites should upgrade as soon as possible.
As the endpoint is unused, the patch simply removes it.
Workarounds
- Log out of Ghost Admin
- Suspend any users who cannot log out
- Block access to
/ghost/preview
Example of how to block access in nginx:
location ~ /ghost/preview {
rewrite ^(\/(.*\/)?ghost\/)(.*)$ $1 redirect;
}
This redirects the endpoint to /ghost/, which mimics the behaviour after the patch is applied.
References
For more information
If you have any questions or comments about this advisory:
- email us at [email protected]
Credits: Paul Gerste, SonarSource (https://www.sonarsource.com/)
Permalink: https://github.com/advisories/GHSA-9fgx-q25h-jxrgJSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLTlmZ3gtcTI1aC1qeHJn
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 3 years ago
Updated: about 1 year ago
CVSS Score: 6.8
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
Identifiers: GHSA-9fgx-q25h-jxrg, CVE-2021-29484
References:
- https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrg
- https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290
- https://www.npmjs.com/package/ghost
- https://nvd.nist.gov/vuln/detail/CVE-2021-29484
- https://security.netapp.com/advisory/ntap-20210618-0006/
- https://blog.sonarsource.com/ghost-admin-takeover
- https://github.com/TryGhost/Ghost/commit/14b3431de12e674a0bd562e9230e2891b6903ae2
- https://github.com/advisories/GHSA-9fgx-q25h-jxrg
Blast Radius: 18.2
Affected Packages
npm:ghost
Dependent packages: 8Dependent repositories: 468
Downloads: 48,713 last month
Affected Version Ranges: >= 4.0.0, < 4.3.3
Fixed in: 4.3.3
All affected versions: 4.0.0, 4.0.1, 4.1.0, 4.1.1, 4.1.2, 4.2.0, 4.2.1, 4.2.2, 4.3.0, 4.3.1, 4.3.2
All unaffected versions: 0.4.2, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.5.6, 0.5.7, 0.5.8, 0.5.9, 0.5.10, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.6.4, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.7.5, 0.7.6, 0.7.7, 0.7.8, 0.7.9, 0.8.0, 0.9.0, 0.10.1, 0.11.0, 0.11.1, 0.11.2, 0.11.3, 0.11.4, 0.11.5, 0.11.6, 0.11.7, 0.11.8, 0.11.9, 0.11.10, 0.11.11, 0.11.12, 0.11.13, 0.11.14, 1.0.0, 1.0.2, 1.1.0, 1.2.0, 1.3.0, 1.4.0, 1.5.0, 1.5.1, 1.5.2, 1.6.0, 1.6.1, 1.6.2, 1.7.0, 1.7.1, 1.8.0, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.9.0, 1.9.1, 1.10.0, 1.11.0, 1.11.1, 1.12.0, 1.12.1, 1.13.0, 1.14.0, 1.14.1, 1.15.0, 1.15.1, 1.16.0, 1.16.1, 1.16.2, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.18.0, 1.18.1, 1.18.2, 1.18.3, 1.18.4, 1.19.0, 1.19.1, 1.19.2, 1.20.0, 1.20.1, 1.20.2, 1.20.3, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.22.5, 1.22.6, 1.22.7, 1.22.8, 1.23.0, 1.23.1, 1.24.0, 1.24.1, 1.24.2, 1.24.3, 1.24.4, 1.24.5, 1.24.6, 1.24.7, 1.24.8, 1.24.9, 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