https://bz.apache.org/bugzilla/show_bug.cgi?id=65802
Bug ID: 65802
Summary: Invalid header name should be rejected in the HTTP
server response
Product: Tomcat 9
Version: 9.0.x
Hardware: Macintosh
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: Connectors
Assignee: dev@tomcat.apache.org
Reporter: renaud.n...@gmail.com
Target Milestone: -----
Overview
========
Tomcat validates HTTP header names for incoming requests (returning a HTTP 400)
but allows to send a response containing illegal header names (either with
HTTP/1.1 or HTTP/2.0).
Context
=======
The HTTP 1.1 specification says
(https://datatracker.ietf.org/doc/html/rfc7230#appendix-B) (reordered) :
> header-field = field-name ":" OWS field-value OWS
> field-name = token
> token = 1*tchar
> tchar = "!" / "#" / "$" / "%" / "&" / "'" / "*" / "+" / "-" / "." /
> "^" / "_" / "`" / "|" / "~" / DIGIT / ALPHA
And also (https://datatracker.ietf.org/doc/html/rfc7230#section-3) :
> A recipient MUST parse an HTTP message as a sequence of octets in an
> encoding that is a superset of US-ASCII [USASCII].
And then HTTP/2.0 RFC says
(https://datatracker.ietf.org/doc/html/rfc7540#section-8.1.2) :
> Just as in HTTP/1.x, header field names are strings of ASCII
> characters that are compared in a case-insensitive fashion. However,
> header field names MUST be converted to lowercase prior to their
> encoding in HTTP/2.
The issue
===============
Tomcat validates **incoming request** headers names(for both HTTP/1.1 and
HTTP/2.0), but does not validate **outgoing response** header names.
Instead of rejecting an illegal header name in the response, Tomcat will
silently corrupt the header.
For example : "😱: header-value" becomes : "? : header-value" (which is not
even a valid header name, according to the RFC extract)
Proposed solution
=================
Tomcat should reject such HTTP response, either during response object creation
or response sending.
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