IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Inbound Connection to an Unsecure Elasticsearch Node

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Inbound Connection to an Unsecure Elasticsearch Node

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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.

Rule type: query

Rule indices:

packetbeat-*
logs-network_traffic.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Use Case: Threat Detection
Tactic: Initial Access
Domain: Endpoint

Version: 103

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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(event.dataset: network_traffic.http or (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

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Initial Access
- ID: TA0001
- Reference URL: https://attack.mitre.org/tactics/TA0001/
Technique:
- Name: Exploit Public-Facing Application
- ID: T1190
- Reference URL: https://attack.mitre.org/techniques/T1190/

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