Description (CNA)
Backstage is an open framework for building developer portals. Multiple Scaffolder actions and archive extraction utilities were vulnerable to symlink-based path traversal attacks. An attacker with access to create and execute Scaffolder templates could exploit symlinks to read arbitrary files via the `debug:log` action by creating a symlink pointing to sensitive files (e.g., `/etc/passwd`, configuration files, secrets); delete arbitrary files via the `fs:delete` action by creating symlinks pointing outside the workspace, and write files outside the workspace via archive extraction (tar/zip) containing malicious symlinks. This affects any Backstage deployment where users can create or execute Scaffolder templates. This vulnerability is fixed in `@backstage/backend-defaults` versions 0.12.2, 0.13.2, 0.14.1, and 0.15.0; `@backstage/plugin-scaffolder-backend` versions 2.2.2, 3.0.2, and 3.1.1; and `@backstage/plugin-scaffolder-node` versions 0.11.2 and 0.12.3. Users should upgrade to these versions or later. Some workarounds are available. Follow the recommendation in the Backstage Threat Model to limit access to creating and updating templates, restrict who can create and execute Scaffolder templates using the permissions framework, audit existing templates for symlink usage, and/or run Backstage in a containerized environment with limited filesystem access.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| backstage / backstage | affected @backstage/backend-defaults < 0.12.2; affected @backstage/backend-defaults >= 0.13.0, < 0.13.2; affected @backstage/backend-defaults >= 0.14.0, < 0.14.1; affected @backstage/plugin-scaffolder-backend < 2.2.2; affected @backstage/plugin-scaffolder-backend >= 3.0.0, < 3.0.2; affected @backstage/plugin-scaffolder-backend >= 3.1.0, < 3.1.1; affected @backstage/plugin-scaffolder-node < 0.11.2; affected @backstage/plugin-scaffolder-node >= 0.12.0, < 0.12.3 |
CWE
CWE-22, CWE-59
References
- https://github.com/backstage/backstage/security/advisories/GHSA-rq6q-wr2q-7pgp
- https://github.com/backstage/backstage/commit/c641c147ab371a9a8a2f5f67fdb7cb9c97ef345d
ADP enrichment
No English description supplied.
No references supplied.
A flaw was found in Backstage. A symlink-based path traversal issue can be exploited in multiple Scaffolder actions and archive extraction utilities during template execution via malicious symlinks. An attacker with access to create and execute Scaffolder templates can read sensitive files, delete arbitrary files or write files outside the intended workspace, resulting in unauthorized information disclosure or system compromise.