Debian 11/12: DSA-5664-1 critical advisory for Jetty 9 DoS threat

Jetty 9 is a Java based web server and servlet engine. It was discovered that
remote attackers may leave many HTTP/2 connections in ESTABLISHED state (not
closed), TCP congested and idle. Eventually the server will stop accepting new
connections from valid clients which can cause a denial of service.

For the oldstable distribution (bullseye), this problem has been fixed
in version 9.4.50-4+deb11u2.

For the stable distribution (bookworm), this problem has been fixed in
version 9.4.50-4+deb12u3.

We recommend that you upgrade your jetty9 packages.

For the detailed security status of jetty9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/jetty9

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/