Debian 10: DSA-5522-3 Critical: Tomcat9 HTTP2 Regression Attack Fix

A regression was discovered in the Http2UpgradeHandler class of Tomcat 9
introduced by the patch to fix CVE-2023-44487 (Rapid Reset Attack). A wrong
value for the overheadcount variable forced HTTP2 connections to close early.

For the oldstable distribution (bullseye), this problem has been fixed
in version 9.0.43-2~deb11u9.

We recommend that you upgrade your tomcat9 packages.

For the detailed security status of tomcat9 please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/tomcat9

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/