CVE-2024-23678
📋 TL;DR
This vulnerability in Splunk Enterprise for Windows allows unsafe deserialization of untrusted data from separate disk partitions due to improper path input sanitization. Attackers could potentially execute arbitrary code on affected systems. Only Windows installations of Splunk Enterprise below specific versions are affected.
💻 Affected Systems
- Splunk Enterprise
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, data exfiltration, and lateral movement within the network.
Likely Case
Local privilege escalation or arbitrary code execution within the Splunk context, potentially leading to data manipulation or further exploitation.
If Mitigated
Limited impact with proper network segmentation and access controls, potentially only affecting the Splunk service account.
🎯 Exploit Status
Exploitation requires access to the Windows system and knowledge of the vulnerability. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 9.0.8 or 9.1.3
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2024-0108
Restart Required: Yes
Instructions:
1. Download Splunk Enterprise version 9.0.8 or 9.1.3 from Splunk website. 2. Backup your Splunk configuration and data. 3. Stop all Splunk services. 4. Install the updated version. 5. Restart Splunk services. 6. Verify the update was successful.
🔧 Temporary Workarounds
Restrict access to Splunk directories
windowsApply strict file system permissions to limit access to Splunk installation directories and data partitions.
icacls "C:\Program Files\Splunk" /inheritance:r /grant:r "SYSTEM:(OI)(CI)F" "Administrators:(OI)(CI)F" "SplunkUser:(OI)(CI)RX"
icacls "C:\Program Files\Splunk\var" /inheritance:r /grant:r "SYSTEM:(OI)(CI)F" "Administrators:(OI)(CI)F" "SplunkUser:(OI)(CI)RX"
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Splunk servers from other critical systems.
- Apply principle of least privilege to Splunk service accounts and restrict access to separate disk partitions.
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface (Settings > Server Info) or command line: "splunk version" and verify if below 9.0.8 or 9.1.3 on Windows.Check Version:
splunk versionVerify Fix Applied:
After patching, verify version is 9.0.8 or higher (for 9.0.x branch) or 9.1.3 or higher (for 9.1.x branch) using "splunk version" command.📡 Detection & Monitoring
Log Indicators:
- Unusual process creation from Splunk service account
- Access to unexpected disk partitions by Splunk processes
- Errors related to deserialization or path handling in Splunk logs
Network Indicators:
- Unusual outbound connections from Splunk servers
- Lateral movement attempts originating from Splunk systems
SIEM Query:
source="splunkd.log" ("deserialization" OR "path" OR "partition") AND (error OR warning OR failed)