Echo: Reverse Proxy Forwards Attacker-Supplied X-Real-IP to Upstream by Default

[ Description ]Official description

Echo is a Go web framework. From 4.0.0 until 5.4.0, the Proxy middleware can preserve an attacker-supplied X-Real-IP header and forward it to an upstream service when Echo.IPExtractor is not configured. A remote client can therefore make upstream services receive a spoofed client address, undermining IP-based access controls, rate limiting, audit logging, or geographic restrictions that trust Echo's forwarded identity. This issue is fixed in Echo 5.4.0.

[ Fixes ]Fixes and patches

• github.com/labstack/echo/v5 5.4.0Fixed version · GitHub Advisories · go package github.com/labstack/echo/v5: upgrade to 5.4.0 or later (affected < 5.4.0)

[ Packages ]Affected open-source packages

• github.com/labstack/echo/v5 goAffected < 5.4.0 · fixed in 5.4.0 · GHSA-99jh-6h7p-pp36
• github.com/labstack/echo/v4 goAffected >= 4.0.0, <= 4.16.2 · GHSA-99jh-6h7p-pp36

[ References ]References

• github.com/labstack/echo/commit/fc410094b2f3415cf2bf5204082137b205bfd5af
• github.com/labstack/echo/releases/tag/v5.4.0
• github.com/labstack/echo/security/advisories/GHSA-99jh-6h7p-pp36