CVE-2021-21419

Advisory

Eventlet 0.31.0 includes a fix for CVE-2021-21419: 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.

Affected package

Affected versions

Fixed versions

Vulnerability changelog

Eventlet 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. See CVE-2021-21419.


CONFIRM:https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2: https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2

Resources

• https://github.com/eventlet/eventlet/security/advisories/GHSA-9p9m-jm8w-94p2
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-21419
• https://lists.fedoraproject.org/archives/list/[email protected]/message/R5JZP4LZOSP7CUAM3GIRW6PIAWKH5VGB/
• https://lists.fedoraproject.org/archives/list/[email protected]/message/2WJFSBPLCNSZNHYQC4QDRDFRTEZRMD2L/