IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
« ImageLoad via Windows Update Auto Update Client Incoming DCOM Lateral Movement via MSHTA »
Elastic Docs ›Elastic Security Solution [8.2] ›Detections and alerts ›Prebuilt rule reference

Inbound Connection to an Unsecure Elasticsearch Node

edit

Inbound Connection to an Unsecure Elasticsearch Node

edit

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:

  • auditbeat-*
  • filebeat-*
  • packetbeat-*
  • logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5 minutes

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

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Network
  • Threat Detection
  • Initial Access
  • Host

Version: 5 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.14.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

edit

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.

Investigation guide

edit
## Config

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.

Rule query

edit
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

Threat mapping

edit

Framework: MITRE ATT&CKTM

Rule version history

edit
Version 5 (7.14.0 release)

  • Updated query, changed from:

    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
Version 4 (7.13.0 release)
  • Formatting only
Version 3 (7.12.0 release)
  • Formatting only
Version 2 (7.11.2 release)
  • Formatting only
« ImageLoad via Windows Update Auto Update Client Incoming DCOM Lateral Movement via MSHTA »