[<prev] [next>] [day] [month] [year] [list]
Date: Fri, 14 Aug 2020 17:14:08 -0400
From: David Smiley <dsmiley@...che.org>
To: oss-security@...ts.openwall.com
Subject: [CVE-2020-13941] Apache Solr information disclosure vulnerability
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
~ David Smiley
Apache Lucene/Solr Search Developer
http://www.linkedin.com/in/davidwsmiley
Powered by blists - more mailing lists
Please check out the
Open Source Software Security Wiki, which is counterpart to this
mailing list.
Confused about mailing lists and their use?
Read about mailing lists on Wikipedia
and check out these
guidelines on proper formatting of your messages.
