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.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "5.3.0"
},
{
"introduced": "0"
},
{
"last_affected": "5.3.1"
},
{
"introduced": "0"
},
{
"last_affected": "5.3.2"
},
{
"introduced": "0"
},
{
"last_affected": "5.4.0"
},
{
"introduced": "0"
},
{
"last_affected": "5.4.1"
},
{
"introduced": "0"
},
{
"last_affected": "5.5.0"
},
{
"introduced": "0"
},
{
"last_affected": "5.5.1"
},
{
"introduced": "0"
},
{
"last_affected": "5.5.2"
},
{
"introduced": "0"
},
{
"last_affected": "5.5.3"
},
{
"introduced": "0"
},
{
"last_affected": "5.5.4"
},
{
"introduced": "0"
},
{
"last_affected": "6.0.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.0.1"
},
{
"introduced": "0"
},
{
"last_affected": "6.1.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.2.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.2.1"
},
{
"introduced": "0"
},
{
"last_affected": "6.3.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.4.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.4.1"
},
{
"introduced": "0"
},
{
"last_affected": "6.4.2"
},
{
"introduced": "0"
},
{
"last_affected": "6.5.0"
},
{
"introduced": "0"
},
{
"last_affected": "6.5.1"
}
]
}