Request Smuggling org.apache.tomcat:tomcat-catalina Dependency in Crowd Data Center and Server

This High severity org.apache.tomcat:tomcat-catalina Dependency vulnerability was introduced in all versions of Crowd Data Center and Server before 5.0.10, 5.1.8 and 5.2.3.

This org.apache.tomcat:tomcat-catalina Dependency vulnerability, with a CVSS Score of 7.5 and a CVSS Vector of CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N allows an unauthenticated attacker to expose assets in your environment susceptible to exploitation which has no impact to confidentiality, high impact to integrity, no impact to availability, and requires no user interaction.

Atlassian recommends that Crowd Data Center and Server customers upgrade to latest version, if you are unable to do so, upgrade your instance to one of the specified supported fixed versions:

• Crowd Data Center and Server 5.2: Upgrade to a release greater than or equal to 5.2.3
• Crowd Data Center and Server 5.1: Upgrade to a release greater than or equal to 5.1.8
• Crowd Data Center and Server 5.0: Upgrade to a release greater than or equal to 5.0.10
• Older Crowd Data Center and Server versions: Upgrade to the newest release greater than or equal to 5.2.3

See the release notes (https://confluence.atlassian.com/crowd/crowd-release-notes-199094.html). You can download the latest version of Crowd Data Center and Server from the download center (https://www.atlassian.com/software/crowd/download-archive).

The National Vulnerability Database provides the following description for this vulnerability: Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single
request as multiple requests leading to the possibility of request
smuggling when behind a reverse proxy.

Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.