GHSA-2g8g-63j4-9w3r RCE vulnerability affecting v1beta3 templates in @backstage/plugin-scaffolder-backend
An attacker with write access to scaffolder templates can achieve remote code execution on the backend by injecting malicious code into template definitions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is GHSA-2g8g-63j4-9w3r?
GHSA-2g8g-63j4-9w3r is a code injection vulnerability in @backstage/plugin-scaffolder-backend, published on 1 Dec 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The templating library used by the scaffolder backend assumes that templates are trusted which is an undesired property of the scaffolder-backend. This has now been mitigated by sandboxing the template code execution.
Impact
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.
Patches
This is vulnerability is patched in version 0.15.14 of @backstage/plugin-scaffolder-backend.
For more information
If you have any questions or comments about this advisory:
- Open an issue in the Backstage repository
- Visit our chat, linked to in Backstage README
Which versions are affected by GHSA-2g8g-63j4-9w3r?
2 open source packages ship an affected version, including @backstage/plugin-scaffolder-backend.
| Package | Affected | Fixed in |
|---|---|---|
@backstage/plugin-scaffolder-backend npm | All versions | 0.15.14 |
@backstage/plugin-scaffolder-backend npm | All versions | 0.15.14 |
How do I fix GHSA-2g8g-63j4-9w3r?
Upgrade @backstage/plugin-scaffolder-backend to 0.15.14 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is GHSA-2g8g-63j4-9w3r being exploited?
There is no known exploitation of GHSA-2g8g-63j4-9w3r in the wild and no public exploit code.