Title: CVE-2017-9803: Security vulnerability in kerberos delegation token functionality** category: solr/security cve: CVE-2017-9803

CVE-2017-9803: Security vulnerability in kerberos delegation token functionality

Severity: Important

Vendor:
The Apache Software Foundation

Versions Affected:
Solr 6.2.0 to 6.6.0

Description:

Solr's Kerberos plugin can be configured to use delegation tokens, which allows an application to reuse the authentication of an end-user or another application. There are two issues with this functionality (when using SecurityAwareZkACLProvider type of ACL provider e.g. SaslZkACLProvider),

Firstly, access to the security configuration can be leaked to users other than the solr super user. Secondly, malicious users can exploit this leaked configuration for privilege escalation to further expose/modify private data and/or disrupt operations in the Solr cluster.

The vulnerability is fixed from Solr 6.6.1 onwards.

Mitigation:
6.x users should upgrade to 6.6.1

Credit:
This issue was discovered by Hrishikesh Gadre of Cloudera Inc.

References:

• https://issues.apache.org/jira/browse/SOLR-11184
• https://wiki.apache.org/solr/SolrSecurity