CVE-2023-50386

Improper Control of Dynamically-Managed Code Resources, Unrestricted Upload
of File with Dangerous Type, Inclusion of Functionality from Untrusted
Control Sphere vulnerability in Apache Solr.This issue affects Apache Solr:
from 6.0.0 through 8.11.2, from 9.0.0 before 9.4.1. In the affected
versions, Solr ConfigSets accepted Java jar and class files to be uploaded
through the ConfigSets API. When backing up Solr Collections, these
configSet files would be saved to disk when using the
LocalFileSystemRepository (the default for backups). If the backup was
saved to a directory that Solr uses in its ClassPath/ClassLoaders, then the
jar and class files would be available to use with any ConfigSet, trusted
or untrusted. When Solr is run in a secure way (Authorization enabled), as
is strongly suggested, this vulnerability is limited to extending the
Backup permissions with the ability to add libraries. Users are recommended
to upgrade to version 8.11.3 or 9.4.1, which fix the issue. In these
versions, the following protections have been added: * Users are no longer
able to upload files to a configSet that could be executed via a Java
ClassLoader. * The Backup API restricts saving backups to directories that
are used in the ClassLoader.