CVE Vulnerability

CVE-2021-29484

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.

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

6.8 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://www.npmjs.com/package/ghost Product Third Party Advisory
https://forum.ghost.org/t/critical-security-update-available-for-ghost-4-x/22290 Vendor Advisory
https://github.com/TryGhost/Ghost/security/advisories/GHSA-9fgx-q25h-jxrg Mitigation Third Party Advisory
https://blog.sonarsource.com/ghost-admin-takeover Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:ghost:ghost:*:*:*:*:*:node.js:*:*
Information

Published : 2021-04-29 09:15

Updated : 2021-09-14 06:47

NVD link : CVE-2021-29484

Mitre link : CVE-2021-29484

Products Affected
No products.
CWE
CWE-79