CVE-2021-21419

NameCVE-2021-21419
DescriptionEventlet is a concurrent networking library for Python. A websocket peer may exhaust memory on Eventlet side by sending very large websocket frames. Malicious peer may exhaust memory on Eventlet side by sending highly compressed data frame. A patch in version 0.31.0 restricts websocket frame to reasonable limits. As a workaround, restricting memory usage via OS limits would help against overall machine exhaustion, but there is no workaround to protect Eventlet process.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs988342

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
python-eventlet (PTS)stretch0.19.0-6vulnerable
buster0.20.0-6vulnerable
bullseye0.26.1-7fixed
bookworm, sid0.30.2-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
python-eventletsource(unstable)0.26.1-7988342

Notes

[buster] - python-eventlet <no-dsa> (Minor issue)
[stretch] - python-eventlet <no-dsa> (Minor issue)
https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2
Fixed by: https://github.com/eventlet/eventlet/commit/1412f5e4125b4313f815778a1acb4d3336efcd07
Issue present as well in versions before introduction of per-message-defalte extension
or compression extension support.
Patch for 0.20 by SuSE: https://bugzilla.suse.com/attachment.cgi?id=849402&action=diff

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