WARNING THIS IS A EXPERIMENTAL object

We have not been able to test, simulate, or build datasets for this object. Use at your own risk. This analytic is NOT supported.

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Description

By enabling Dynamic ARP Inspection as a Layer 2 Security measure on the organization’s network devices, we will be able to detect ARP Poisoning attacks in the Infrastructure.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2020-08-11
  • Author: Mikael Bjerkeland, Splunk
  • ID: b44bebd6-bd39-467b-9321-73971bcd7aac

Annotations

ATT&CK
ID Technique Tactic
T1200 Hardware Additions Initial Access
T1498 Network Denial of Service Impact
T1557 Adversary-in-the-Middle Collection, Credential Access
T1557.002 ARP Cache Poisoning Collection, Credential Access
Kill Chain Phase
  • Reconnaissance
  • Delivery
  • Actions on Objectives
NIST
  • ID.AM
  • PR.DS
CIS20
  • CIS 1
  • CIS 11
CVE
1
2
3
4
5
6
`cisco_networks` facility="PM" mnemonic="ERR_DISABLE" disable_cause="arp-inspection" 
| eval src_interface=src_int_prefix_long+src_int_suffix 
| stats min(_time) AS firstTime max(_time) AS lastTime count BY host src_interface 
| `security_content_ctime(firstTime)`
|`security_content_ctime(lastTime)`
| `detect_arp_poisoning_filter`

Macros

The SPL above uses the following Macros:

Note that detect_arp_poisoning_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • facility
  • mnemonic
  • disable_cause
  • src_int_prefix_long
  • src_int_suffix
  • host
  • src_interface

How To Implement

This search uses a standard SPL query on logs from Cisco Network devices. The network devices must be configured with DHCP Snooping (see https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-0_2_EX/security/configuration_guide/b_sec_152ex_2960-x_cg/b_sec_152ex_2960-x_cg_chapter_01101.html) and Dynamic ARP Inspection (see https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-2_2_e/security/configuration_guide/b_sec_1522e_2960x_cg/b_sec_1522e_2960x_cg_chapter_01111.html) and log with a severity level of minimum “5 - notification”. The search also requires that the Cisco Networks Add-on for Splunk (https://splunkbase.splunk.com/app/1467) is used to parse the logs from the Cisco network devices.

Known False Positives

This search might be prone to high false positives if DHCP Snooping or ARP inspection has been incorrectly configured, or if a device normally sends many ARP packets (unlikely).

Associated Analytic story

RBA

Risk Score Impact Confidence Message
25.0 50 50 tbd

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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