Cisco LDP Authentication Failures — Sigma Rule

Rule metadata and linked tags

Author: Tim Brown. Source status: test; severity: low. Source dates: 2023-01-09 / not supplied.

{
  "product": "cisco",
  "service": "ldp",
  "definition": "Requirements: cisco ldp logs need to be enabled and ingested"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 31db3554c5444ae51464435eedcf435732f398f8e294e8ca2ef39bb1e231756f

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Cisco LDP Authentication Failures
id: 50e606bf-04ce-4ca7-9d54-3449494bbd4b
status: test
description: Detects LDP failures which may be indicative of brute force attacks to manipulate MPLS labels
references:
    - https://www.blackhat.com/presentations/bh-usa-03/bh-us-03-convery-franz-v3.pdf
author: Tim Brown
date: 2023-01-09
tags:
    - attack.initial-access
    - attack.persistence
    - attack.privilege-escalation
    - attack.credential-access
    - attack.collection
    - attack.stealth
    - attack.t1078
    - attack.t1110
    - attack.t1557
logsource:
    product: cisco
    service: ldp
    definition: 'Requirements: cisco ldp logs need to be enabled and ingested'
detection:
    selection_protocol:
        - 'LDP'
    selection_keywords:
        - 'SOCKET_TCP_PACKET_MD5_AUTHEN_FAIL'
        - 'TCPMD5AuthenFail'
    condition: selection_protocol and selection_keywords
falsepositives:
    - Unlikely. Except due to misconfigurations
level: low

Original YAML and metadata in JSON

False positives

• Unlikely. Except due to misconfigurations

Source references

• https://www.blackhat.com/presentations/bh-usa-03/bh-us-03-convery-franz-v3.pdf