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
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)
|
|
trusty |
Needs triage
|
|
upstream |
Needs triage
|
|
impish |
Ignored
(end of life)
|
|
xenial |
Released
(1:4.0.34-1ubuntu0.1~esm1)
Available with Ubuntu Pro |
|
jammy |
Released
(1:4.1.48-4+deb11u1build0.22.04.1)
|
|
kinetic |
Released
(1:4.1.48-5ubuntu0.1)
|
|
mantic |
Needed
|
|
lunar |
Ignored
(end of life, was needed)
|
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 |
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-43797
- https://github.com/netty/netty/security/advisories/GHSA-wx5j-54mm-rqqq
- https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323 (netty-4.1.71.Final)
- https://github.com/netty/netty/commit/07aa6b5938a8b6ed7a6586e066400e2643897323
- https://ubuntu.com/security/notices/USN-6049-1
- NVD
- Launchpad
- Debian