CVE-2024-45731
📋 TL;DR
This vulnerability allows low-privileged Splunk users without admin or power roles to write files to the Windows system root directory (typically System32) when Splunk Enterprise is installed on a separate drive. This affects Splunk Enterprise for Windows installations below specific patched versions. Attackers could potentially escalate privileges or execute arbitrary code.
💻 Affected Systems
- Splunk Enterprise for Windows
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
An attacker could write malicious executables to System32, leading to privilege escalation, persistence mechanisms, or remote code execution with SYSTEM privileges.
Likely Case
Low-privileged users could write configuration files or scripts to System32, potentially enabling privilege escalation or bypassing security controls.
If Mitigated
With proper role-based access controls and monitoring, impact is limited to unauthorized file writes that can be detected and remediated.
🎯 Exploit Status
Exploitation requires authenticated access with any non-admin Splunk role and specific installation configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.3.1, 9.2.3, or 9.1.6
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2024-1001
Restart Required: Yes
Instructions:
1. Backup Splunk configuration and data. 2. Download appropriate patched version from Splunk website. 3. Run installer with administrative privileges. 4. Restart Splunk services.
🔧 Temporary Workarounds
Restrict Splunk user permissions
windowsReview and minimize Splunk user roles to only necessary permissions
Monitor System32 directory writes
windowsImplement file integrity monitoring on System32 directory
🧯 If You Can't Patch
- Implement strict role-based access control for Splunk users
- Deploy endpoint detection and response (EDR) to monitor for suspicious file writes to System32
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface (Settings > Server Info) or command line, and verify installation is on separate drive from Windows system drive.Check Version:
splunk versionVerify Fix Applied:
Confirm Splunk version is 9.3.1, 9.2.3, or 9.1.6 or higher, and test that low-privileged users cannot write to System32.📡 Detection & Monitoring
Log Indicators:
- Splunk audit logs showing file write operations by non-admin users
- Windows event logs showing file creation in System32 by Splunk processes
SIEM Query:
source="WinEventLog:Security" EventCode=4663 ObjectName="*\System32\*" ProcessName="*splunk*" | stats count by AccountName, ObjectName