libtomcat9-java: Path Equivalence: 'file.Name' (Internal Dot) leading to Remote CodeExecution and/or Information disclosure and/or mal...

Path Equivalence: 'file.Name' (Internal Dot) leading to Remote CodeExecution and/or Information disclosure and/or malicious content added touploaded files via write enabled Default Servlet in Apache Tomcat.This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.2, from10.1.0-M1 through 10.1.34, from 9.0.0.M1 through 9.0.98.The following versions were EOL at the time the CVE was created but areknown to be affected: 8.5.0 though 8.5.100. Other, older, EOL versionsmay also be affected.If all of the following were true, a malicious user was able to viewsecurity sensitive files and/or inject content into those files:- writes enabled for the default servlet (disabled by default)- support for partial PUT (enabled by default)- a target URL for security sensitive uploads that was a sub-directory of atarget URL for public uploads- attacker knowledge of the names of security sensitive filesbeing uploaded- the security sensitive files also being uploaded via partial PUTIf all of the following were true, a malicious user was able toperform remote code execution:- writes enabled for the default servlet (disabled by default)- support for partial PUT (enabled by default)- application was using Tomcat's file based session persistence withthe default storage location- application included a library that may be leveraged in a deserializationattackUsers are recommended to upgrade to version 11.0.3, 10.1.35 or 9.0.99,which fixes the issue.

Where it's fixed