A permission issue was found in Elasticsearch versions before 5.6.15 and 6.6.1 when Field Level Security and Document Level Security are disabled and the _aliases, _shrink, or _split endpoints are used . If the elasticsearch.yml file has xpack.security.dls_fls.enabled set to false, certain permission checks are skipped when users perform one of the actions mentioned above, to make existing data available under a new index/alias name. This could result in an attacker gaining additional permissions against a restricted index.
[
{
"product": "Elasticsearch",
"vendor": "Elastic",
"versions": [
{
"status": "affected",
"version": "before 5.6.15 and 6.6.1"
}
]
}
]