How to upgrade Tomcat to v8.5.51 on Jira v8.8.1 (CVE-2020-1935) (CVE-2020-1938)?

[arthur.ly]

The version of Tomcat installed on the remote host is prior to 7.0.100, 8.x prior to 8.5.51, or 9.x prior to 9.0.31. It is, therefore, affected by multiple vulnerabilities.

- An HTTP request smuggling vulnerability exists in Tomcat due to mishandling Transfer-Encoding headers behind a reverse proxy. An unauthenticated, remote attacker can exploit this, via crafted HTTP requests, to cause unintended HTTP requests to reach the back-end. (CVE-2019-17569)

- An HTTP request smuggling vulnerability exists in Tomcat due to bad end-of-line (EOL) parsing that allowed some invalid HTTP headers to be parsed as valid. An unauthenticated, remote attacker can exploit this, via crafted HTTP requests, to cause unintended HTTP requests to reach the back-end. (CVE-2020-1935)

- An arbitrary file read vulnerability exists in Tomcat's Apache JServ Protocol (AJP) due to an implementation defect. A remote, unauthenticated attacker could exploit this to access files which, under normal conditions, would be restricted. If the Tomcat instance supports file uploads, the vulnerability could also be leveraged to achieve remote code execution. (CVE-2020-1938)

[RianS]

I am looking at these particular vulnerabilities and are curious whether you have received any answers on how to handle this in the environment. The Atlassian documentation for the AJP connector vulnerability isn't super helpful ("Stop using it") when you rely on that connector for functionality.