Description (CNA)
Echo is a Go web framework. In versions 5.0.0 through 5.0.2 on Windows, Echo’s `middleware.Static` using the default filesystem allows path traversal via backslashes, enabling unauthenticated remote file read outside the static root. In `middleware/static.go`, the requested path is unescaped and normalized with `path.Clean` (URL semantics). `path.Clean` does not treat `\` as a path separator, so `..\` sequences remain in the cleaned path. The resulting path is then passed to `currentFS.Open(...)`. When the filesystem is left at the default (nil), Echo uses `defaultFS` which calls `os.Open` (`echo.go:792`). On Windows, `os.Open` treats `\` as a path separator and resolves `..\`, allowing traversal outside the static root. Version 5.0.3 fixes the issue.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| labstack / echo | affected >= 5.0.0, < 5.0.3 |
CWE
CWE-22
References
- https://github.com/labstack/echo/security/advisories/GHSA-pgvm-wxw2-hrv9
- https://github.com/labstack/echo/pull/2891
- https://github.com/labstack/echo/commit/b1d443086ea27cf51345ec72a71e9b7e9d9ce5f1
ADP enrichment
No English description supplied.
No references supplied.