CVE-2021-43797

Name	CVE-2021-43797
Description	Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. Netty prior to version 4.1.71.Final skips control chars when they are present at the beginning / end of the header name. It should instead fail fast as these are not allowed by the spec and could lead to HTTP request smuggling. Failing to do the validation might cause netty to "sanitize" header names before it forward these to another remote system when used as proxy. This remote system can't see the invalid usage anymore, and therefore does not do the validation itself. Users should upgrade to version 4.1.71.Final.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3268-1, DSA-5316-1
Debian Bugs	1001437

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
netty (PTS)	buster	1:4.1.33-1+deb10u2	vulnerable
	buster (security)	1:4.1.33-1+deb10u4	fixed
	bullseye (security), bullseye	1:4.1.48-4+deb11u2	fixed
	bookworm, bookworm (security)	1:4.1.48-7+deb12u1	fixed
	sid, trixie	1:4.1.48-9	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
netty	source	buster	1:4.1.33-1+deb10u3	DLA-3268-1
netty	source	bullseye	1:4.1.48-4+deb11u1	DSA-5316-1
netty	source	(unstable)	1:4.1.48-6		1001437

Notes

[stretch] - netty <no-dsa> (Minor issue)
https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323 (netty-4.1.71.Final)