Title: [CVE-2020-13941] Apache Solr information disclosure vulnerability category: solr/security cve: CVE-2020-13941

Severity:

Medium

Description

Reported in SOLR-14515 (private) and fixed in SOLR-14561 (public), released in Solr version 8.6.0. The Replication handler (https://lucene.apache.org/solr/guide/8_6/index-replication.html#http-api-commands-for-the-replicationhandler) allows commands backup, restore and deleteBackup. Each of these take a location parameter, which was not validated, i.e you could read/write to any location the solr user can access.

On a windows system SMB paths such as \10.0.0.99\share\folder may also be used, leading to:

• The possibility of restoring another SolrCore from a server on the network (or mounted remote file system) may lead to:
  • Exposing search index data that the attacker should otherwise not have access to
  • Replacing the index data entirely by loading it from a remote file system that the attacker controls
• Launching SMB attacks which may result in:
  • The exfiltration of sensitive data such as OS user hashes (NTLM/LM hashes),
  • In case of misconfigured systems, SMB Relay Attacks which can lead to user impersonation on SMB Shares or, in a worse-case scenario, Remote Code Execution

The solution implemented to address these issues was to:

• Restrict the location parameter to trusted paths
• Prevent remote connection when using Windows UNC Paths

Credit:

To security researcher Matei “Mal” Badanoiu for finding and reporting the vulnerability