| Name | CVE-2020-11612 |
| Description | The ZlibDecoders in Netty 4.1.x before 4.1.46 allow for unbounded memory allocation while decoding a ZlibEncoded byte stream. An attacker could send a large ZlibEncoded byte stream to the Netty server, forcing the server to allocate all of its free memory to a single decoder. |
| 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-2364-1, DSA-4885-1 |
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 (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 | Urgency | Origin | Debian Bugs |
|---|
| netty | source | stretch | 1:4.1.7-2+deb9u2 | | DLA-2364-1 | |
| netty | source | buster | 1:4.1.33-1+deb10u2 | | DSA-4885-1 | |
| netty | source | (unstable) | 1:4.1.48-1 | | | |
Notes
[jessie] - netty <ignored> (OOM DoS with fix/mitigation involving new API; too intrusive to backport due to more limited 3.x buffer API)
https://github.com/netty/netty/issues/6168
https://github.com/netty/netty/pull/9924
https://github.com/netty/netty/commit/1543218d3e7afcb33a90b728b14370395a3deca0