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.
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Solr | Apache | 5.3.0 (including) | 5.3.0 (including) |
| Solr | Apache | 5.3.1 (including) | 5.3.1 (including) |
| Solr | Apache | 5.3.2 (including) | 5.3.2 (including) |
| Solr | Apache | 5.4.0 (including) | 5.4.0 (including) |
| Solr | Apache | 5.4.1 (including) | 5.4.1 (including) |
| Solr | Apache | 5.5.0 (including) | 5.5.0 (including) |
| Solr | Apache | 5.5.1 (including) | 5.5.1 (including) |
| Solr | Apache | 5.5.2 (including) | 5.5.2 (including) |
| Solr | Apache | 5.5.3 (including) | 5.5.3 (including) |
| Solr | Apache | 5.5.4 (including) | 5.5.4 (including) |
| Solr | Apache | 6.0.0 (including) | 6.0.0 (including) |
| Solr | Apache | 6.0.1 (including) | 6.0.1 (including) |
| Solr | Apache | 6.1.0 (including) | 6.1.0 (including) |
| Solr | Apache | 6.2.0 (including) | 6.2.0 (including) |
| Solr | Apache | 6.2.1 (including) | 6.2.1 (including) |
| Solr | Apache | 6.3.0 (including) | 6.3.0 (including) |
| Solr | Apache | 6.4.0 (including) | 6.4.0 (including) |
| Solr | Apache | 6.4.1 (including) | 6.4.1 (including) |
| Solr | Apache | 6.4.2 (including) | 6.4.2 (including) |
| Solr | Apache | 6.5.0 (including) | 6.5.0 (including) |
| Solr | Apache | 6.5.1 (including) | 6.5.1 (including) |