Name:ConnectWise ScreenConnect Path Traversal Windows SACL id:4e127857-1fc9-4c95-9d69-ba24c91d52d7 version:4 date:2024-11-28 author:Michael Haag, Splunk status:production type:TTP Description:The following analytic detects attempts to exploit the ConnectWise ScreenConnect CVE-2024-1708 vulnerability using Windows SACL EventCode 4663. It identifies path traversal attacks by monitoring file system events related to the ScreenConnect service. This activity is significant as it allows unauthorized access to sensitive files and directories, potentially leading to data exfiltration or arbitrary code execution. If confirmed malicious, attackers could gain unauthorized access to critical data or execute harmful code, compromising the integrity and security of the affected system. Immediate remediation by updating to version 23.9.8 or above is recommended. Data_source:
-Windows Event Log Security 4663
search:`wineventlog_security` EventCode=4663 ProcessName=*\\ScreenConnect.Service.exe file_path IN ("*\\ScreenConnect\\App_Extensions\\*") file_name IN ("*.aspx","*.ashx") | stats count min(_time) as firstTime max(_time) as lastTime by ObjectName ObjectType ProcessName AccessMask process_id EventCode Computer Caller_User_Name | rename Computer as dest Caller_User_Name as user ProcessName as process_name | `security_content_ctime(firstTime)` | `security_content_ctime(lastTime)` | `connectwise_screenconnect_path_traversal_windows_sacl_filter`
how_to_implement:To implement the following query, enable SACL auditing for the ScreenConnect directory(ies). With this data, the following analytic will work correctly. A GIST is provided in the references to assist with enabling SACL Auditing. known_false_positives:False positives should be limited as the analytic is specific to ScreenConnect path traversal attempts. Tune as needed, or restrict to specific hosts if false positives are encountered. References: -https://learn.microsoft.com/en-us/windows/security/threat-protection/auditing/event-4663 -https://www.huntress.com/blog/a-catastrophe-for-control-understanding-the-screenconnect-authentication-bypass -https://www.huntress.com/blog/detection-guidance-for-connectwise-cwe-288-2 -https://www.connectwise.com/company/trust/security-bulletins/connectwise-screenconnect-23.9.8 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: analytic_story: - 'ConnectWise ScreenConnect Vulnerabilities' - 'Compromised Windows Host' asset_type:Endpoint confidence:100 impact:100 message:A path traversal attack against ScreenConnect has been detected on $dest$. mitre_attack_id: - 'T1190' observable: name:'dest' type:'Hostname' - role: - 'Victim' product: - 'Splunk Enterprise' - 'Splunk Enterprise Security' - 'Splunk Cloud' required_fields: - 'ObjectName' - 'ObjectType' - 'ProcessName' - 'AccessMask' - 'process_id' - 'EventCode' - 'Computer' - 'Caller_User_Name' risk_score:100 security_domain:endpoint cve: - 'CVE-2024-1708' - 'CVE-2024-1709'
