Backstage: Improper validation of MkDocs theme configuration in TechDocs

[ Description ]Official description

Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs theme configuration in techdocs. When TechDocs is configured to build documentation locally or in a container, a user with write access to a registered repository can include configuration values in mkdocs.yml that cause arbitrary code execution during the documentation build process. This issue is fixed in versions 1.14.6 and 1.15.4.

[ Fixes ]Fixes and patches

• @backstage/plugin-techdocs-node 1.15.4Fixed version · GitHub Advisories · npm package @backstage/plugin-techdocs-node: upgrade to 1.15.4 or later (affected < 1.15.4)
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD
• Patch on github.comVendor patch or bulletin · NVD · Reference tagged 'Patch' by NVD

[ Packages ]Affected open-source packages

• @backstage/plugin-techdocs-node npmAffected < 1.15.4 · fixed in 1.15.4 · GHSA-8w7q-29mw-gf5c

[ References ]References

• github.com/backstage/backstage/commit/02cd7cdbb18b687446277b5602adaee7f1d53cbbExploitPatch
• github.com/backstage/backstage/commit/a900a9953c8f7ad3ba1906d1d257725a9996cc9dExploitPatch
• github.com/backstage/backstage/releases/tag/v1.50.5Release Notes
• github.com/backstage/backstage/releases/tag/v1.54.6Release Notes
• github.com/backstage/backstage/security/advisories/GHSA-8w7q-29mw-gf5cVendor AdvisoryMitigation