Bug 2263585 (CVE-2023-50386) - CVE-2023-50386 solr: backup/restore APIs allow for deployment of executables in malicious ConfigSets
Summary: CVE-2023-50386 solr: backup/restore APIs allow for deployment of executables ...
Keywords:
Status: NEW
Alias: CVE-2023-50386
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
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Depends On:
Blocks: 2263574
TreeView+ depends on / blocked
 
Reported: 2024-02-09 22:21 UTC by Robb Gatica
Modified: 2024-05-08 20:58 UTC (History)
29 users (show)

Fixed In Version: solr 8.11.3, solr 9.4.1
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Doc Text:
A flaw was found in Apache Solr. In the affected versions, ConfigSets accept uploading Java jar and class files through the ConfigSets API. When backing up Solr Collections, these ConfigSet files are saved to the disk when using the LocalFileSystemRepository (the default for backups). If the backup was saved to a directory that Solr uses in its ClassPath/ClassLoaders, the jar and class files are available to use with any trusted or untrusted ConfigSet. This issue may allow an attacker to deploy malicious code on the system.
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Description Robb Gatica 2024-02-09 22:21:39 UTC 
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.

References:
http://www.openwall.com/lists/oss-security/2024/02/09/1
https://solr.apache.org/security.html#cve-2023-50386-apache-solr-backuprestore-apis-allow-for-deployment-of-executables-in-malicious-configsets
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