Apache Solr CVE-2017-7660 Security Bypass Vulnerability

by CIRT Team

Description: 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. The following versions are affected:

• Apache Solr 5.3 through 5.5.4 and
• Apache Solr 6.0 through 6.5.1

Impact:  Attackers can exploit this issue to bypass certain security restrictions and perform unauthorized actions. This may aid in further attacks.

Mitigation: Updates are available. Please check specific vendor advisory for more information.

Reference URL’s:

• http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=2017-7660
• http://www.securityfocus.com/bid/99485/info
• https://issues.apache.org/jira/browse/SOLR-10624
• http://seclists.org/oss-sec/2017/q3/81
• http://lucene.apache.org/solr/

CIRT Team