Ivanti Connect Secure System Information Access via Auth Bypass

name: Ivanti Connect Secure System Information Access via Auth Bypass
id: d51c13dd-a232-4c83-a2bb-72ab36233c5d
version: 7
date: '2026-03-10'
author: Michael Haag, Splunk
status: production
type: Anomaly
data_source:
    - Suricata
description: The following analytic identifies attempts to exploit the CVE-2023-46805 and CVE-2024-21887 vulnerabilities in Ivanti Connect Secure. It detects GET requests to the /api/v1/totp/user-backup-code/../../system/system-information URI, which leverage an authentication bypass to access system information. The detection uses the Web datamodel to identify requests with a 200 OK response, indicating a successful exploit attempt. This activity is significant as it reveals potential unauthorized access to sensitive system information. If confirmed malicious, attackers could gain critical insights into the system, facilitating further exploitation and compromise.
search: |-
    | tstats count min(_time) as firstTime max(_time) as lastTime FROM datamodel=Web
      WHERE Web.url="*/api/v1/totp/user-backup-code/../../system/system-information*" Web.http_method=GET Web.status=200
      BY Web.src, Web.dest, Web.http_user_agent,
         Web.url
    | `drop_dm_object_name("Web")`
    | `security_content_ctime(firstTime)`
    | `security_content_ctime(lastTime)`
    | `ivanti_connect_secure_system_information_access_via_auth_bypass_filter`
how_to_implement: This detection requires the Web datamodel to be populated from a supported Technology Add-On like Suricata, Splunk for Apache, Splunk for Nginx, or Splunk for Palo Alto.
known_false_positives: This analytic is limited to HTTP Status 200; adjust as necessary. False positives may occur if the URI path is IP-restricted or externally blocked. It's recommended to review the context of the alerts and adjust the analytic parameters to better fit the specific environment.
references:
    - https://github.com/RootUp/PersonalStuff/blob/master/http-vuln-cve2023-46805_2024_21887.nse
    - https://github.com/projectdiscovery/nuclei-templates/blob/c6b351e71b0fb0e40e222e97038f1fe09ac58194/http/misconfiguration/ivanti/CVE-2023-46085-CVE-2024-21887-mitigation-not-applied.yaml
    - https://github.com/rapid7/metasploit-framework/pull/18708/files
drilldown_searches:
    - name: View the detection results for - "$dest$"
      search: '%original_detection_search% | search  dest = "$dest$"'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
    - name: View risk events for the last 7 days for - "$dest$"
      search: '| from datamodel Risk.All_Risk | search normalized_risk_object IN ("$dest$") starthoursago=168  | stats count min(_time) as firstTime max(_time) as lastTime values(search_name) as "Search Name" values(risk_message) as "Risk Message" values(analyticstories) as "Analytic Stories" values(annotations._all) as "Annotations" values(annotations.mitre_attack.mitre_tactic) as "ATT&CK Tactics" by normalized_risk_object | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)`'
      earliest_offset: $info_min_time$
      latest_offset: $info_max_time$
rba:
    message: Possible exploitation of CVE-2023-46805 and CVE-2024-21887 against $dest$.
    risk_objects:
        - field: dest
          type: system
          score: 20
    threat_objects: []
tags:
    cve:
        - CVE-2023-46805
        - CVE-2024-21887
    analytic_story:
        - Ivanti Connect Secure VPN Vulnerabilities
        - CISA AA24-241A
    asset_type: VPN Appliance
    atomic_guid: []
    mitre_attack_id:
        - T1190
    product:
        - Splunk Enterprise
        - Splunk Enterprise Security
        - Splunk Cloud
    security_domain: network
tests:
    - name: True Positive Test
      attack_data:
        - data: https://media.githubusercontent.com/media/splunk/attack_data/master/datasets/attack_techniques/T1190/ivanti/suricata_ivanti_secure_connect_checkphase.log
          source: not_applicable
          sourcetype: suricata