885999 – (CVE-2022-41717) [Tracker] Denial of service in Go's http server

Bug 885999 (CVE-2022-41717) - [Tracker] Denial of service in Go's http server

Summary: [Tracker] Denial of service in Go's http server

Status:	CONFIRMED

Alias:	CVE-2022-41717

Product:	Gentoo Security
Classification:	Unclassified
Component:	Vulnerabilities (show other bugs)
Hardware:	All Linux

Importance:	Normal normal (vote)
Assignee:	Gentoo Security

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Depends on:	885997 886509 883783
Blocks:
	Show dependency tree

Reported:	2022-12-14 23:21 UTC by John Helmert III
Modified:	2022-12-17 23:58 UTC (History)
CC List:	0 users

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Runtime testing required:	---

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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."