GHSA-788w-68h3-cvxp: Code Injection
Impact
An image processing library bundled with Ghost contained a vulnerability in its SVG handling. Any staff user, including Contributors, could create a bookmark card for an attacker-controlled website, resulting in arbitrary commands being run on the Ghost server.
Vulnerable versions
This vulnerability is present in Ghost from v6.56.0 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
We thank Rafael B. 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
Who can exploit this issue?
Any Ghost staff user, including users with the Contributor role, can exploit it. Exploitation requires that the staff user create a bookmark card pointing to an attacker-controlled website.
Which installations are affected and what version fixes it?
Ghost versions from 6.56.0 through 6.65.0 are vulnerable. Version 6.67.0 contains the fix.
What is the impact of successful exploitation?
Successful exploitation can result in arbitrary commands being run on the Ghost server. This can affect confidentiality, integrity, and availability of the server.