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CVE-2021-43797

Published: 9 December 2021

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.

Priority

Medium

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
netty
Launchpad, Ubuntu, Debian
bionic
Released (1:4.1.7-4ubuntu0.1+esm2)
Available with Ubuntu Pro
focal
Released (1:4.1.45-1ubuntu0.1~esm1)
Available with Ubuntu Pro
hirsute Ignored
(end of life)
impish Ignored
(end of life)
jammy
Released (1:4.1.48-4+deb11u1build0.22.04.1)
kinetic
Released (1:4.1.48-5ubuntu0.1)
lunar Ignored
(end of life, was needed)
mantic Needed

noble Needed

trusty Needs triage

upstream Needs triage

xenial
Released (1:4.0.34-1ubuntu0.1~esm1)
Available with Ubuntu Pro

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N