Inbound Connection to an Unsecure Elasticsearch Node

 1[metadata]
 2creation_date = "2020/08/11"
 3integration = ["network_traffic"]
 4maturity = "production"
 5updated_date = "2024/05/21"
 6
 7[rule]
 8author = ["Elastic"]
 9description = """
10Identifies Elasticsearch nodes that do not have Transport Layer Security (TLS), and/or lack authentication, and are
11accepting inbound network connections over the default Elasticsearch port.
12"""
13false_positives = [
14    """
15    If you have front-facing proxies that provide authentication and TLS, this rule would need to be tuned to eliminate
16    the source IP address of your reverse-proxy.
17    """,
18]
19from = "now-9m"
20index = ["packetbeat-*", "logs-network_traffic.*"]
21language = "lucene"
22license = "Elastic License v2"
23name = "Inbound Connection to an Unsecure Elasticsearch Node"
24note = """## Setup
25
26This 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."""
27references = [
28    "https://www.elastic.co/guide/en/elasticsearch/reference/current/configuring-security.html",
29    "https://www.elastic.co/guide/en/beats/packetbeat/current/packetbeat-http-options.html#_send_all_headers",
30]
31risk_score = 47
32rule_id = "31295df3-277b-4c56-a1fb-84e31b4222a9"
33severity = "medium"
34tags = ["Use Case: Threat Detection", "Tactic: Initial Access", "Domain: Endpoint"]
35timestamp_override = "event.ingested"
36type = "query"
37
38query = '''
39(event.dataset: network_traffic.http OR (event.category: network_traffic AND network.protocol: http)) AND
40    status:OK AND destination.port:9200 AND network.direction:inbound AND NOT http.response.headers.content-type:"image/x-icon" AND NOT
41    _exists_:http.request.headers.authorization
42'''
43
44
45[[rule.threat]]
46framework = "MITRE ATT&CK"
47[[rule.threat.technique]]
48id = "T1190"
49name = "Exploit Public-Facing Application"
50reference = "https://attack.mitre.org/techniques/T1190/"
51
52
53[rule.threat.tactic]
54id = "TA0001"
55name = "Initial Access"
56reference = "https://attack.mitre.org/tactics/TA0001/"