Echo has a Static Middleware Double-Unescape Path Traversal

[ Description ]Official description

Echo is a Go web framework. Prior to 4.15.3 and 5.2.0, middleware.Static can decode an already decoded Request.URL.Path a second time. Double-encoded separators can consequently be reconstructed before filesystem resolution. This can reach a file under a guarded route when the static middleware is registered globally. This issue is fixed in 4.15.3 and 5.2.0.

[ Fixes ]Fixes and patches

• github.com/labstack/echo/v5 5.2.0Fixed version · GitHub Advisories · go package github.com/labstack/echo/v5: upgrade to 5.2.0 or later (affected < 5.2.0)
• github.com/labstack/echo/v4 4.15.3Fixed version · GitHub Advisories · go package github.com/labstack/echo/v4: upgrade to 4.15.3 or later (affected < 4.15.3)

[ Packages ]Affected open-source packages

• github.com/labstack/echo/v5 goAffected < 5.2.0 · fixed in 5.2.0 · GHSA-xwq5-6cqp-vx96
• github.com/labstack/echo/v4 goAffected < 4.15.3 · fixed in 4.15.3 · GHSA-xwq5-6cqp-vx96

[ References ]References

• github.com/labstack/echo/commit/a9ede66a5a7196411131beb1ee801e75bbaf7ac6
• github.com/labstack/echo/commit/c3fa2a27ff92b2b8db360de614f999ef1da24725
• github.com/labstack/echo/issues/2599
• github.com/labstack/echo/pull/3006
• github.com/labstack/echo/releases/tag/v4.15.3
• github.com/labstack/echo/releases/tag/v5.2.0
• github.com/labstack/echo/security/advisories/GHSA-xwq5-6cqp-vx96