GHSA-9m4w-fmjw-fvjq: Medium severity npm/ghost vulnerability
Impact
A crafted request to the external media inliner could cause excessive CPU usage, making the Ghost server unresponsive. Exploiting this requires Administrator access.
Vulnerable versions
This vulnerability is present in Ghost from v5.37.0 up to v6.65.0.
Patches
v6.67.0 contains a fix for this issue.
How to update
For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.
If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.
References
Ghost thanks ka3n1x for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email us at security@ghost.org.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/ghostto a version that resolves this vulnerability.Fixed in 6.67.0 - Upgrade
Upgrade
Ghostto a version that resolves this vulnerability.Fixed in 6.67.0
Event History
Frequently Asked Questions
Which deployments are affected?
Self-hosted Ghost installations running versions from 5.37.0 through 6.65.0 are affected. The issue is in the external media inliner.
What access does an attacker need?
An attacker needs Administrator access to send the crafted request that triggers excessive CPU usage. The advisory does not describe exploitation by unauthenticated or lower-privileged users.
What is the operational impact of exploitation?
A crafted request can cause excessive CPU consumption and make the Ghost server unresponsive. The provided impact information indicates availability impact only, with no stated confidentiality or integrity impact.
What version fixes the issue?
Ghost version 6.67.0 contains the fix. Update Docker-based installations using the official Ghost image update process, or use the Ghost-CLI update process for Ghost-CLI installations.