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For a long time we used `HTTP_HOST` as a fallback for `fullBaseUrl`, but doing so makes applications vulnerable to host header injection. In #1071, the `HostHeaderMiddleware` was introduced to address this weakness. However, in #1076 the debug condition was removed to address feedback, but also re-opened the weakness to host-header injection. These changes restore the `debug` check around automatically trusting `HTTP_HOST`. The `HostHeaderMiddleware` is applied *after* error handling so configuration mistakes are easy to identify. Thanks to Jaro Varga for reporting this.
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For a long time we used
HTTP_HOSTas a fallback forfullBaseUrl, but doing so makes applications vulnerable to host header injection. In #1071, theHostHeaderMiddlewarewas introduced to address this weakness. However, in #1076 the debug condition was removed to address feedback, but also re-opened the weakness to host-header injection.These changes restore the
debugcheck around automatically trustingHTTP_HOST. TheHostHeaderMiddlewareis applied after error handling so configuration mistakes are easy to identify.Thanks to Jaro Varga for reporting this.