Re: [quicwg/base-drafts] Import HTTP/2 Security Considerations (#3531)

Lucas Pardue <> Fri, 20 March 2020 17:41 UTC

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From: Lucas Pardue <>
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Subject: Re: [quicwg/base-drafts] Import HTTP/2 Security Considerations (#3531)
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LPardue commented on this pull request.

@MikeBishop these comments/suggestion address my earlier one about use of headers. I might be applying things wrong.

> +- the inclusion of uppercase header field names, or
+- the inclusion of invalid characters in header field names or values

- the inclusion of uppercase field names, or
- the inclusion of invalid characters in field names or values

> +features are strictly bounded.
+The number of PUSH_PROMISE frames is constrained in a similar fashion.  A client
+that accepts server push SHOULD limit the number of Push IDs it issues at a
+Processing capacity cannot be guarded as effectively as state capacity.
+The ability to send undefined protocol elements which the peer is required to
+ignore can be abused to cause a peer to expend additional processing time.  This
+might be done by setting multiple undefined SETTINGS parameters, unknown frame
+types, or unknown stream types.  Note, however, that some uses are entirely
+legitimate, such as optional-to-understand extensions and padding to increase
+resistance to traffic analysis.
+Header compression also offers some opportunities to waste processing resources;

Is it still called "header compression" in a post-header world?

> +A server that receives a larger header block than it is willing to handle can
+send an HTTP 431 (Request Header Fields Too Large) status code {{?RFC6585}}.  A
+client can discard responses that it cannot process.

Is this behaviour restricted to encoded blocks of Header field sections? Could a large trailer section trigger it?

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