CVE-2023-35926: Insecure sandbox in Backstage Scaffolder plugin

First published: Wed Jun 21 2023(Updated: )

Backstage is an open platform for building developer portals. The Backstage scaffolder-backend plugin uses a templating library that requires 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`.

Credit: security-advisories@github.com security-advisories@github.com

Affected Software	Affected Version	How to fix
Linuxfoundation Backstage	<1.15.0
npm/@backstage/plugin-scaffolder-backend	<1.15.0	1.15.0

Remedy

https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a

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