CVE-2025-20366
📋 TL;DR
A low-privileged user in Splunk Enterprise or Splunk Cloud Platform can access sensitive search results by guessing the unique Search ID (SID) of administrative background search jobs. This affects users without admin or power roles in vulnerable versions. The vulnerability allows unauthorized access to potentially confidential data.
💻 Affected Systems
- Splunk Enterprise
- Splunk Cloud Platform
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Sensitive data exposure including credentials, PII, or proprietary information from administrative search results accessed by unauthorized users.
Likely Case
Unauthorized access to search results containing operational data, configuration details, or limited sensitive information.
If Mitigated
Minimal impact with proper access controls, monitoring, and network segmentation in place.
🎯 Exploit Status
Requires authenticated low-privileged user and ability to guess or discover SIDs.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Splunk Enterprise 9.4.4, 9.3.6, 9.2.8; Splunk Cloud Platform 9.3.2411.111, 9.3.2408.119, 9.2.2406.122
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2025-1001
Restart Required: Yes
Instructions:
1. Backup Splunk configuration and data. 2. Download appropriate patch version from Splunk downloads. 3. Stop Splunk services. 4. Install update following Splunk documentation. 5. Restart Splunk services. 6. Verify version and functionality.
🔧 Temporary Workarounds
Restrict administrative search jobs
allLimit use of administrative search jobs in background or ensure they don't contain sensitive data.
Enhance access controls
allReview and tighten role-based access controls for search functionality.
🧯 If You Can't Patch
- Implement strict network segmentation to limit access to Splunk instances
- Enhance monitoring and alerting for unusual search activity patterns
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface or CLI and compare against affected versions.Check Version:
splunk versionVerify Fix Applied:
Confirm version is at or above patched versions and test access controls for search jobs.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to search jobs
- Multiple failed SID guessing attempts
- Access to search results by low-privileged users
Network Indicators:
- Unusual search API calls from non-admin users
- Patterns of SID enumeration attempts
SIEM Query:
index=_audit action=search user=* NOT (role=admin OR role=power) search_id=* | stats count by user, search_id