CVE-2021-29484 Information

Description

Ghost is a Node.js CMS. 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. The issue has been 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. As a workaround blocking access to /ghost/preview can also mitigate the issue.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://www.npmjs.com/package/ghost https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290 https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrg https://blog.sonarsource.com/ghost-admin-takeover

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1