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.
2017-07-07T19:29:00.197
2025-04-20T01:37:25.860
Deferred
CVSSv3.0: 7.5 (HIGH)
AV:N/AC:L/Au:N/C:N/I:P/A:N
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | apache | solr | 5.3.0 | Yes |
| Application | apache | solr | 5.3.1 | Yes |
| Application | apache | solr | 5.3.2 | Yes |
| Application | apache | solr | 5.4.0 | Yes |
| Application | apache | solr | 5.4.1 | Yes |
| Application | apache | solr | 5.5.0 | Yes |
| Application | apache | solr | 5.5.1 | Yes |
| Application | apache | solr | 5.5.2 | Yes |
| Application | apache | solr | 5.5.3 | Yes |
| Application | apache | solr | 5.5.4 | Yes |
| Application | apache | solr | 6.0.0 | Yes |
| Application | apache | solr | 6.0.1 | Yes |
| Application | apache | solr | 6.1.0 | Yes |
| Application | apache | solr | 6.2.0 | Yes |
| Application | apache | solr | 6.2.1 | Yes |
| Application | apache | solr | 6.3.0 | Yes |
| Application | apache | solr | 6.4.0 | Yes |
| Application | apache | solr | 6.4.1 | Yes |
| Application | apache | solr | 6.4.2 | Yes |
| Application | apache | solr | 6.5.0 | Yes |
| Application | apache | solr | 6.5.1 | Yes |