CVE-2023-35926
The Backstage scaffolder-backend plugin uses a templating library that requires sandbox, as it by design allows for code injection.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.89%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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`.
- CVSS 3.1
- 9.9 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 1.89% probability · 78th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-94
- Affected
- linuxfoundation/backstage
- Source
- security-advisories@github.com
References
- https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949aPatch
- https://github.com/backstage/backstage/releases/tag/v1.15.0Release Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmrVendor Advisory
- https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949aPatch
- https://github.com/backstage/backstage/releases/tag/v1.15.0Release Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmrVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.