| Package | Affected versions | Patched versions |
|---|---|---|
| backstage | < 1.15.0 | 1.15.0 |
| @backstage/plugin-scaffolder-backend | < 1.15.0 | 1.15.0 |
The Backstage scaffolder-backend plugin uses a templating library that requires a sandbox, as it by design allows for code injection. The library used for this sandbox so far has been vm2, but in light of several past vulnerabilities and existing vulnerabilities that may not have a fix, the plugin has switched to using a different sandbox library.
A malicious actor with write access to a registered scaffolder template could manipulate the template in a way that allows for remote code execution on the scaffolder-backend instance. This was only exploitable in the template YAML definition itself and not by user input data.
This is vulnerability is fixed in version 1.15.0 of @backstage/plugin-scaffolder-backend.
Note that the Backstage Threat Model states that scaffolder templates are considered to be a sensitive area that with the recommendation that you control access and perform manual reviews of changes to the scaffolder templates. The exploit is of a nature where it is easily discoverable in manual review.
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