Bug 885999 (CVE-2022-41717)

Summary:	[Tracker] Denial of service in Go's http server
Product:	Gentoo Security	Reporter:	John Helmert III <ajak>
Component:	Vulnerabilities	Assignee:	Gentoo Security <security>
Status:	CONFIRMED ---
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---
Bug Depends on:	885997, 886509, 883783
Bug Blocks:

Description John Helmert III archtester

2022-12-14 23:21:32 UTC

"net/http: limit canonical header cache by bytes, not entries

An attacker can cause excessive memory growth in a Go server accepting HTTP/2 requests.

HTTP/2 server connections contain a cache of HTTP header keys sent by the client. While the total number of entries in this cache is capped, an attacker sending very large keys can cause the server to allocate approximately 64 MiB per open connection.

This issue is also fixed in golang.org/x/net/http2 vX.Y.Z, for users manually configuring HTTP/2.

Thanks to Josselin Costanzi for reporting this issue.

This is CVE-2022-41717 and Go issue https://go.dev/issue/56350."