| Name | CVE-2021-21409 |
| Description | Netty is an open-source, asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients. In Netty (io.netty:netty-codec-http2) before version 4.1.61.Final there is a vulnerability that enables request smuggling. The content-length header is not correctly validated if the request only uses a single Http2HeaderFrame with the endStream set to to true. This could lead to request smuggling if the request is proxied to a remote peer and translated to HTTP/1.1. This is a followup of GHSA-wm47-8v5p-wjpj/CVE-2021-21295 which did miss to fix this one case. This was fixed as part of 4.1.61.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 | DSA-4885-1 |
| Debian Bugs | 986217 |
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 | fixed |
| buster (security) | 1:4.1.33-1+deb10u4 | fixed |
| bullseye | 1:4.1.48-4+deb11u1 | fixed |
| bullseye (security) | 1:4.1.48-4+deb11u2 | fixed |
| bookworm, bookworm (security) | 1:4.1.48-7+deb12u1 | fixed |
| trixie | 1:4.1.48-8 | fixed |
| sid | 1:4.1.48-9 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| netty | source | buster | 1:4.1.33-1+deb10u2 | | DSA-4885-1 | |
| netty | source | (unstable) | 1:4.1.48-4 | | | 986217 |
Notes
[stretch] - netty <ignored> (Minor issue, fix requires major changes of HTTP2 module)
Fixed by: https://github.com/netty/netty/commit/b0fa4d5aab4215f3c22ce6123dd8dd5f38dc0432
https://github.com/netty/netty/security/advisories/GHSA-f256-j965-7f32
Is a followup to: https://github.com/netty/netty/security/advisories/GHSA-wm47-8v5p-wjpj