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Date: Mon, 12 Oct 2020 11:39:50 -0700
From: Tomas Fernandez Lobbe <>
Subject: [CVE-2020-13957] The checks added to unauthenticated configset
 uploads in Apache Solr can be circumvented

Severity: High

Vendor: The Apache Software Foundation

Versions Affected:
6.6.0 to 6.6.5
7.0.0 to 7.7.3
8.0.0 to 8.6.2

Solr prevents some features considered dangerous (which could be used for
remote code execution) to be configured in a ConfigSet that's uploaded via
API without authentication/authorization. The checks in place to prevent
such features can be circumvented by using a combination of UPLOAD/CREATE

Any of the following are enough to prevent this vulnerability:
* Disable UPLOAD command in ConfigSets API if not used by setting the
system property: "configset.upload.enabled" to "false" [1]
* Use Authentication/Authorization and make sure unknown requests aren't
allowed [2]
* Upgrade to Solr 8.6.3 or greater.
* If upgrading is not an option, consider applying the patch in SOLR-14663
* No Solr API, including the Admin UI, is designed to be exposed to
non-trusted parties. Tune your firewall so that only trusted computers and
people are allowed access

Tomás Fernández Löbbe, András Salamon


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