| 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) | jessie, jessie (lts) | 1:3.2.6.Final-2+deb8u2 | fixed |
| stretch (security) | 1:4.1.7-2+deb9u3 | vulnerable |
| stretch (lts), stretch | 1:4.1.7-2+deb9u5 | vulnerable |
| buster (security), buster, buster (lts) | 1:4.1.33-1+deb10u5 | fixed |
| bullseye (security), bullseye | 1:4.1.48-4+deb11u2 | fixed |
| bookworm (security), bookworm | 1:4.1.48-7+deb12u1 | fixed |
| sid, trixie | 1:4.1.48-10 | fixed |
| netty-3.9 (PTS) | jessie, jessie (lts) | 3.9.0.Final-1+deb8u2 | fixed |
| stretch (security) | 3.9.9.Final-1+deb9u1 | fixed |
| stretch (lts), stretch | 3.9.9.Final-1+deb9u2 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| netty | source | jessie | (not affected) | | | |
| netty | source | buster | 1:4.1.33-1+deb10u2 | | DSA-4885-1 | |
| netty | source | (unstable) | 1:4.1.48-4 | | | 986217 |
| netty-3.9 | source | (unstable) | (not affected) | | | |
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
[jessie] - netty <not-affected> (HTTP/2 support added in v4.1)
- netty-3.9 <not-affected> (HTTP/2 support added in v4.1)