Insecure Default Initialization of Resource

Summary

Insecure Default Initialization of Resource vulnerability in Apache Solr. New "ConfigSets" that are created via a "Restore command", which copy a "configSet" from the backup and, give it a new name, are created without setting the "trusted" metadata. "ConfigSets" that do not contain the flag are trusted implicitly if the metadata is missing, therefore this leads to "trusted" ConfigSets that may not have been created with an authenticated request. "trusted" ConfigSets are able to load custom code into "classloaders", therefore the flag is supposed to only be set when the request that uploads the ConfigSet is Authenticated & Authorized. This issue affects org.apache.solr:solr-core package versions 6.6.0 through 8.11.3, and 9.0.0 through 9.6.1. This issue does not affect Solr instances that are secured via Authentication/Authorization. Users are primarily recommended to use Authentication and Authorization when running Solr. However, upgrading to a fixed version will mitigate this issue otherwise.