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[email protected]CVE-2021-29484

HistoryApr 29, 2021 - 9:15 p.m.

CVE-2021-29484

2021-04-2921:15:08

CWE-79

[email protected]

web.nvd.nist.gov

cve-2021-29484

ghost cms

node.js

security

vulnerability

admin access

unauthorized access

patch

mitigation

4.3 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:M/Au:N/C:N/I:P/A:N

6.8 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

NONE

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

6.2 Medium

AI Score

Confidence

High

0.015 Low

EPSS

Percentile

86.9%

JSON

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.

Affected configurations

Vulners

NVD

Node

tryghostghostRange4.0.0–4.3.3

CPENameOperatorVersion
ghost:ghostghostlt4.3.3

CPE	Name	Operator	Version
ghost:ghost	ghost	lt	4.3.3

CNA Affected

[
  {
    "product": "Ghost",
    "vendor": "TryGhost",
    "versions": [
      {
        "status": "affected",
        "version": ">= 4.0.0, < 4.3.3"
      }
    ]
  }
]