جزئیات آسیب‌پذیری

esm.sh is a no-build content delivery network (CDN) for web development. Prior to server version 137_7, the documented web.NewHandler static file server in web/handler.go joins the URL-decoded r.URL.Path with Config.AppDir without verifying that the result remains inside the configured application directory. URL-encoded dot segments such as %2e%2e bypass the plain traversal redirect performed by Go's ServeMux, allowing an unauthenticated remote attacker to make the server open and return files outside Config.AppDir that are readable by the server process. The confirmed impact is file disclosure only, and the issue is reachable with Dev disabled. This issue is fixed in server version 137_7.

• https://github.com/esm-dev/esm.sh/security/advisories/GHSA-g3c2-rjq2-c763 x_refsource_CONFIRM
• https://github.com/esm-dev/esm.sh/pull/1376 x_refsource_MISC
• https://github.com/esm-dev/esm.sh/commit/468b6b2a4b4dfec334cf6b33b01fcd4e5cd93bed x_refsource_MISC
• https://github.com/esm-dev/esm.sh/commit/fc3b345e73aeaa0b7a05b6f27d91c05fdf5f9b53 x_refsource_MISC
• https://github.com/esm-dev/esm.sh/releases/tag/v137_7 x_refsource_MISC