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Security Advisories: GSA_kwCzR0hTQS13ZzZwLWptcGMteGptcs4AAz-Z

Backstage Scaffolder plugin has insecure sandbox

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.

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 fixed in version 1.15.0 of @backstage/plugin-scaffolder-backend.

Workarounds

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.

Permalink: https://github.com/advisories/GHSA-wg6p-jmpc-xjmr
JSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS13ZzZwLWptcGMteGptcs4AAz-Z
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: over 1 year ago
Updated: about 1 year ago


CVSS Score: 8.1
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Identifiers: GHSA-wg6p-jmpc-xjmr, CVE-2023-35926
References: Repository: https://github.com/backstage/backstage
Blast Radius: 21.3

Affected Packages

npm:@backstage/plugin-scaffolder-backend
Dependent packages: 66
Dependent repositories: 424
Downloads: 207,501 last month
Affected Version Ranges: < 1.15.0
Fixed in: 1.15.0
All affected versions: 0.1.1, 0.2.0, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 0.4.0, 0.4.1, 0.5.0, 0.5.1, 0.5.2, 0.6.0, 0.7.0, 0.7.1, 0.8.0, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 0.9.6, 0.10.0, 0.10.1, 0.11.0, 0.11.1, 0.11.2, 0.11.3, 0.11.4, 0.11.5, 0.12.0, 0.12.1, 0.12.2, 0.12.3, 0.12.4, 0.13.0, 0.14.0, 0.14.1, 0.14.2, 0.15.0, 0.15.1, 0.15.2, 0.15.3, 0.15.4, 0.15.5, 0.15.6, 0.15.7, 0.15.8, 0.15.9, 0.15.10, 0.15.11, 0.15.12, 0.15.13, 0.15.14, 0.15.15, 0.15.16, 0.15.17, 0.15.18, 0.15.19, 0.15.20, 0.15.21, 0.15.22, 0.15.23, 0.15.24, 0.16.0, 0.16.1, 0.17.0, 0.17.1, 0.17.2, 0.17.3, 0.18.0, 1.0.0, 1.1.0, 1.2.0, 1.3.0, 1.3.1, 1.4.0, 1.5.0, 1.5.1, 1.6.0, 1.7.0, 1.8.0, 1.9.0, 1.10.0, 1.10.1, 1.11.0, 1.12.0, 1.13.0, 1.13.1, 1.14.0
All unaffected versions: 1.15.0, 1.15.1, 1.16.0, 1.16.1, 1.16.2, 1.16.3, 1.16.4, 1.16.5, 1.17.0, 1.17.1, 1.17.2, 1.17.3, 1.18.0, 1.18.1, 1.19.0, 1.19.1, 1.19.2, 1.20.0, 1.21.0, 1.21.1, 1.21.2, 1.21.3, 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.22.5, 1.22.6, 1.22.7, 1.22.8, 1.22.9, 1.22.10, 1.22.11, 1.23.0, 1.24.0, 1.24.1, 1.25.0, 1.26.0, 1.26.1, 1.26.2