{"id":"GHSA-wg6p-jmpc-xjmr","summary":"Backstage Scaffolder plugin has insecure sandbox","details":"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.\n\n### Impact\n\nA 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.\n\n### Patches\n\nThis is vulnerability is fixed in version 1.15.0 of `@backstage/plugin-scaffolder-backend`.\n\n### Workarounds\n\nNote that the [Backstage Threat Model](https://backstage.io/docs/overview/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.","aliases":["CVE-2023-35926"],"modified":"2023-11-01T05:02:23.964059Z","published":"2023-06-21T22:00:30Z","database_specific":{"nvd_published_at":"2023-06-22T14:15:09Z","cwe_ids":["CWE-94"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2023-06-21T22:00:30Z"},"references":[{"type":"WEB","url":"https://github.com/backstage/backstage/security/advisories/GHSA-wg6p-jmpc-xjmr"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-35926"},{"type":"WEB","url":"https://github.com/backstage/backstage/commit/fb7375507d56faedcb7bb3665480070593c8949a"},{"type":"PACKAGE","url":"https://github.com/backstage/backstage"},{"type":"WEB","url":"https://github.com/backstage/backstage/releases/tag/v1.15.0"}],"affected":[{"package":{"name":"@backstage/plugin-scaffolder-backend","ecosystem":"npm","purl":"pkg:npm/%40backstage/plugin-scaffolder-backend"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.15.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/06/GHSA-wg6p-jmpc-xjmr/GHSA-wg6p-jmpc-xjmr.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H"}]}