Apache Solr, the cluster can be partitioned into multiple collections and only a subset of nodes actually host any given collection

Overview :

In Apache Solr, the cluster can be partitioned into multiple collections and only a subset of nodes actually host any given collection. However, if a node receives a request for a collection it does not host, it proxies the request to a relevant node and serves the request. Solr bypasses all authorization settings for such requests. This affects all Solr versions prior to 7.7 that use the default authorization mechanism of Solr (RuleBasedAuthorizationPlugin).

CVE-2018-11802

Subject: CVE-2018-11802: Apache Solr authorization bug vulnerability disclosure

CVE-2018-11802: Apache Solr authorization bug disclosure
Severity: Important
Vendor: The Apache Software Foundation
Versions Affected: Apache Solr 7.6 or less

Description:
jira  ticket : https://issues.apache.org/jira/browse/SOLR-12514
In apache Solr the cluster can be partitioned into multiple
collections and only a subset of nodes actually host any given
collection. However, if a node receives a request for a collection it
does not host, it proxies the request to a relevant node and serves
the request. Solr bypasses all authorization settings for such
requests. This affects all Solr versions that uses the default
authorization mechanism of Solr (RuleBasedAuthorizationPlugin)

Mitigation:
A fix is provided in Solr 7.7 version and upwards. If you use Solr's
authorization mechanism, please upgrade to a version newer than Solr
7.7.

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