CVE-2023-22939
📋 TL;DR
This vulnerability in Splunk Enterprise allows higher-privileged users to bypass SPL safeguards for risky commands via the 'map' search command. It affects Splunk Enterprise instances with Splunk Web enabled, requiring user interaction through a browser. Only authenticated users with elevated privileges can exploit this flaw.
💻 Affected Systems
- Splunk Enterprise
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Privileged user could execute arbitrary commands on the Splunk server, potentially leading to full system compromise, data exfiltration, or lateral movement within the network.
Likely Case
Privileged user could bypass intended security controls to run unauthorized SPL commands, potentially accessing sensitive data or modifying configurations.
If Mitigated
With proper access controls and monitoring, impact would be limited to authorized users misusing their legitimate privileges within expected boundaries.
🎯 Exploit Status
Exploitation requires authenticated privileged user with browser access to Splunk Web interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.1.13, 8.2.10, or 9.0.4
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2023-0209
Restart Required: Yes
Instructions:
1. Backup Splunk configuration and data. 2. Download appropriate patched version from Splunk downloads. 3. Stop Splunk services. 4. Install update following Splunk upgrade documentation. 5. Restart Splunk services. 6. Verify version and functionality.
🔧 Temporary Workarounds
Disable Splunk Web
allTemporarily disable Splunk Web interface to prevent browser-based exploitation
splunk disable webserver
Restrict User Privileges
allReview and reduce privileges for users who don't require 'map' command access
Review roles.conf and authorize.conf configurations
🧯 If You Can't Patch
- Implement strict access controls and monitor privileged user activities
- Disable unnecessary SPL commands via limits.conf for high-risk users
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface or CLI. If version is below 8.1.13, 8.2.10, or 9.0.4 and Splunk Web is enabled, system is vulnerable.Check Version:
splunk versionVerify Fix Applied:
Verify version is 8.1.13, 8.2.10, 9.0.4 or higher. Test that 'map' command no longer bypasses SPL safeguards.📡 Detection & Monitoring
Log Indicators:
- Unusual 'map' command usage patterns
- SPL command execution that bypasses normal safeguards
- Privileged user activity anomalies
Network Indicators:
- Unusual HTTP requests to Splunk Web involving 'map' commands
SIEM Query:
index=_audit action=search search="*map*" | stats count by user, search