Title: CVE-2017-7660: Security Vulnerability in secure inter-node communication in Apache Solr** category: solr/security cve: CVE-2017-7660

CVE-2017-7660: Security Vulnerability in secure inter-node communication in Apache Solr

Severity: Important

Vendor:
The Apache Software Foundation

Versions Affected:

• Solr 5.3 to 5.5.4
• Solr 6.0 to 6.5.1

Description:
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.

Mitigation:

• 6.x users should upgrade to 6.6.0 or higher
• 5.x users should obtain the latest source from git and apply this patch: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/2f5ecbcf

Credit:
This issue was discovered by Noble Paul of Lucidworks Inc.

References:

• https://issues.apache.org/jira/browse/SOLR-10624
• https://wiki.apache.org/solr/SolrSecurity