Update ActiveMQ to fix CVE-2023-46604

h3. Issue Summary

Bamboo relies on ActiveMQ libraries version <= 5.16.6 or <=5.18.2 which are affected by [CVE-2023-46604|https://nvd.nist.gov/vuln/detail/CVE-2023-46604].

An official advisory has been released. Please check [CVE-2023-46604 - Apache ActiveMQ RCE Vulnerability impacts Bamboo Data Center and Server|https://jira.atlassian.com/browse/BAM-25444] and the [FAQ|https://confluence.atlassian.com/kb/faq-for-cve-2023-46604-1318881301.html] for details.
h3. Steps to Reproduce

On the Bamboo instance, validate the ActiveMQ library versions in {{{}<bamboo-install>/atlassian-bamboo/WEB-INF/lib{}}}:
{noformat}
$ ls -al /opt/atlassian/bamboo/atlassian-bamboo/WEB-INF/lib# ls | grep activemq-
activemq-broker-5.18.2.jar
activemq-client-5.18.2.jar
activemq-http-5.18.2.jar
activemq-jms-pool-5.18.2.jar
activemq-kahadb-store-5.18.2.jar
activemq-openwire-legacy-5.18.2.jar
activemq-pool-5.18.2.jar
activemq-protobuf-1.1.jar
activemq-ra-5.18.2.jar
activemq-spring-5.18.2.jar
{noformat}
h3. Expected Results

The updated ActiveMQ library version is >= 5.16.7 or >= 5.18.3
h3. Actual Results

The ActiveMQ library version is <= 5.16.6 or <=5.18.2
h3. Workaround

Make sure that Bamboo is behind a firewall/VPC and allows connections to its ActiveMQ broker port only from trusted Agents.