Possible Cisco LDP Authentication Failures (via ldp)

title: Possible Cisco LDP Authentication Failures (via ldp)
id: 5b6dcbbe-eb7f-51c6-87d3-79ccf9e2b53e
status: stable
description: This rule detects LDP failures which may be indicative of brute force attacks to manipulate MPLS labels
references:
    - https://attack.mitre.org/techniques/T1557/
    - https://attack.mitre.org/techniques/T1110/
    - https://attack.mitre.org/techniques/T1078/
    - https://www.blackhat.com/presentations/bh-usa-03/bh-us-03-convery-franz-v3.pdf
author: Huntrule Team
date: 2026-01-20
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:
    - Unknown
level: low