Backstage has iImproper filesystem validation in Bitbucket pull-request scaffolder actions

[ Description ]Official description

Backstage is an open framework for building developer portals. Prior to 0.3.10 in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud and 0.2.25 in @backstage/plugin-scaffolder-backend-module-bitbucket-server, the Bitbucket pull-request Scaffolder actions did not sufficiently validate filesystem paths. An authenticated user who can execute an eligible template and influence an allowed Bitbucket repository could affect paths outside the expected working area, potentially compromising backend confidentiality, integrity, or availability. This issue is fixed in @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10 and @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25.

[ Fixes ]Fixes and patches

• @backstage/plugin-scaffolder-backend-module-bitbucket-cloud 0.3.10Fixed version · GitHub Advisories · npm package @backstage/plugin-scaffolder-backend-module-bitbucket-cloud: upgrade to 0.3.10 or later (affected < 0.3.10)
• @backstage/plugin-scaffolder-backend-module-bitbucket-server 0.2.25Fixed version · GitHub Advisories · npm package @backstage/plugin-scaffolder-backend-module-bitbucket-server: upgrade to 0.2.25 or later (affected < 0.2.25)

[ Packages ]Affected open-source packages

• @backstage/plugin-scaffolder-backend-module-bitbucket-cloud npmAffected < 0.3.10 · fixed in 0.3.10 · GHSA-g8rx-f7m5-7794
• @backstage/plugin-scaffolder-backend-module-bitbucket-server npmAffected < 0.2.25 · fixed in 0.2.25 · GHSA-g8rx-f7m5-7794

[ References ]References

• github.com/backstage/backstage/commit/818528e112c36167d76187e9e63fb518399c4dd2
• github.com/backstage/backstage/releases/tag/v1.54.6
• github.com/backstage/backstage/security/advisories/GHSA-g8rx-f7m5-7794