sigma-rules/rules/network/initial_access_unsecure_elasticsearch_node.toml

[metadata]
creation_date = "2020/08/11"
maturity = "production"
updated_date = "2020/11/03"

[rule]
author = ["Elastic"]
description = """
Identifies Elasticsearch nodes that do not have Transport Layer Security (TLS), and/or lack authentication, and are
accepting inbound network connections over the default Elasticsearch port.
"""
false_positives = [
    """
    If you have front-facing proxies that provide authentication and TLS, this rule would need to be tuned to eliminate
    the source IP address of your reverse-proxy.
    """,
]
index = ["packetbeat-*"]
language = "lucene"
license = "Elastic License"
name = "Inbound Connection to an Unsecure Elasticsearch Node"
note = "This rule requires the addition of port `9200` and `send_all_headers` to the `HTTP` protocol configuration in `packetbeat.yml`. See the References section for additional configuration documentation."
references = [
    "https://www.elastic.co/guide/en/elasticsearch/reference/current/configuring-security.html",
    "https://www.elastic.co/guide/en/beats/packetbeat/current/packetbeat-http-options.html#_send_all_headers",
]
risk_score = 47
rule_id = "31295df3-277b-4c56-a1fb-84e31b4222a9"
severity = "medium"
tags = ["Elastic", "Network", "Threat Detection", "Initial Access"]
type = "query"

query = '''
event.category:network_traffic AND network.protocol:http AND status:OK AND destination.port:9200 AND network.direction:inbound AND NOT http.response.headers.content-type:"image/x-icon" AND NOT _exists_:http.request.headers.authorization
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1190"
name = "Exploit Public-Facing Application"
reference = "https://attack.mitre.org/techniques/T1190/"


[rule.threat.tactic]
id = "TA0001"
name = "Initial Access"
reference = "https://attack.mitre.org/tactics/TA0001/"