Skip to content

Ghost vulnerable to remote code execution in locale setting change

Moderate severity GitHub Reviewed Published Jun 15, 2022 in TryGhost/Ghost • Updated Jan 6, 2023

Package

npm ghost (npm)

Affected versions

< 4.48.2
>= 5.0.0, < 5.2.3

Patched versions

4.48.2
5.2.3

Description

Impact

A vulnerability in an upstream library means an authenticated attacker can abuse locale input to execute arbitrary commands from a file that has previously been uploaded using the file upload functionality in the post editor.

Patches

Fixed in 5.2.3, all 5.x sites should update as soon as possible.
Fixed in 4.48.2, all 4.x sites should update as soon as possible.

Workarounds

Patched versions of Ghost add validation to the locale input to prevent execution of arbitrary files. Updating Ghost is the quickest complete solution.

As a workaround, if for any reason you cannot update your Ghost instance, you can block the POST /ghost/api/admin/settings/ endpoint, which will also disable updating settings for your site.

For more information

If you have any questions or comments about this advisory:

Credits

References

@daniellockyer daniellockyer published to TryGhost/Ghost Jun 15, 2022
Published to the GitHub Advisory Database Jun 17, 2022
Reviewed Jun 17, 2022
Last updated Jan 6, 2023

Severity

Moderate

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
Low

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:L

Weaknesses

No CWEs

CVE ID

No known CVE

GHSA ID

GHSA-7v28-g2pq-ggg8

Source code

Credits

Loading Checking history
See something to contribute? Suggest improvements for this vulnerability.