A tomcat9 security update has been released for Debian GNU/Linux 10 to address several security vulnerabilities.

DLA 3160-1: tomcat9 security update

-------------------------------------------------------------------------
Debian LTS Advisory DLA-3160-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
October 26, 2022   https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : tomcat9
Version : 9.0.31-1~deb10u7
CVE ID : CVE-2021-43980 CVE-2022-23181 CVE-2022-29885

Several security vulnerabilities have been discovered in the Tomcat
servlet and JSP engine.

CVE-2021-43980

The simplified implementation of blocking reads and writes introduced in
Tomcat 10 and back-ported to Tomcat 9.0.47 onwards exposed a long standing
(but extremely hard to trigger) concurrency bug that could cause client
connections to share an Http11Processor instance resulting in responses, or
part responses, to be received by the wrong client.

CVE-2022-23181

The fix for bug CVE-2020-9484 introduced a time of check, time of use
vulnerability into Apache Tomcat that allowed a local attacker to perform
actions with the privileges of the user that the Tomcat process is using.
This issue is only exploitable when Tomcat is configured to persist
sessions using the FileStore.

CVE-2022-29885

The documentation of Apache Tomcat for the EncryptInterceptor incorrectly
stated it enabled Tomcat clustering to run over an untrusted network. This
was not correct. While the EncryptInterceptor does provide confidentiality
and integrity protection, it does not protect against all risks associated
with running over any untrusted network, particularly DoS risks.

For Debian 10 buster, these problems have been fixed in version
9.0.31-1~deb10u7.

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/tomcat9

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