CVE-2024-23672: Apache Tomcat: WebSocket DoS with incomplete closing handshake

[Mark Thomas <markt () apache org>]

Severity: important

Affected versions:

- Apache Tomcat 11.0.0-M1 through 11.0.0-M16
- Apache Tomcat 10.1.0-M1 through 10.1.18
- Apache Tomcat 9.0.0-M1 through 9.0.85
- Apache Tomcat 8.5.0 through 8.5.98

Description:

Denial of Service via incomplete cleanup vulnerability in Apache Tomcat. 
It was possible for WebSocket clients to keep WebSocket connections open 
leading to increased resource consumption.This issue affects Apache 
Tomcat: from 11.0.0-M1 through 11.0.0-M16, from 10.1.0-M1 through 
10.1.18, from 9.0.0-M1 through 9.0.85, from 8.5.0 through 8.5.98.

Users are recommended to upgrade to version 11.0.0-M17, 10.1.19, 9.0.86 
or 8.5.99 which fixes the issue.

References:

https://lists.apache.org/thread/cmpswfx6tj4s7x0nxxosvfqs11lvdx2f
https://tomcat.apache.org/
https://www.cve.org/CVERecord?id=CVE-2024-23672