Name:Ivanti Connect Secure System Information Access via Auth Bypass id:d51c13dd-a232-4c83-a2bb-72ab36233c5d version:3 date:2024-09-30 author:Michael Haag, Splunk status:production type:Anomaly 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. Data_source:
-Suricata
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:'$info_max_time$' tags: cve: - 'CVE-2023-46805' - 'CVE-2024-21887' analytic_story: - 'Ivanti Connect Secure VPN Vulnerabilities' - 'CISA AA24-241A' asset_type:VPN Appliance atomic_guid: confidence:80 impact:90 message:Possible exploitation of CVE-2023-46805 and CVE-2024-21887 against $dest$. mitre_attack_id: - 'T1190' observable: name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' risk_score:72 required_fields: - 'Web.src' - 'Web.dest' - 'Web.http_user_agent' - 'Web.url' security_domain:network
