GHSA-c82r-qg3w-q5mv Apache Solr insecure inter-node communication

• Maven org.apache.solr:solr-core: >= 5.3.0, < 5.5.5 → fixed in 5.5.5 • Maven org.apache.solr:solr-core: >= 6.0.0, < 6.6.0 → fixed in 6.6.0

Apache Solr uses a PKI based mechanism to secure inter-node communication when security is enabled. It is possible to create a specially crafted node name that does not exist as part of the cluster and point it to a malicious node. This can trick the nodes in cluster to believe that the malicious node is a member of the cluster. So, if Solr users have enabled BasicAuth authentication mechanism using the BasicAuthPlugin or if the user has implemented a custom Authentication plugin, which does not implement either "HttpClientInterceptorPlugin" or "HttpClientBuilderPlugin", his/her servers are vulnerable to this attack. Users who only use SSL without basic authentication or those who use Kerberos are not affected.