CVE-2025-20389
📋 TL;DR
A low-privileged user without admin or power roles can craft a malicious payload in the label column field when adding a new device in the Splunk Secure Gateway app, potentially causing client-side denial of service. This affects Splunk Enterprise versions below 10.0.2, 9.4.6, 9.3.8, and 9.2.10, and Splunk Secure Gateway app versions below 3.9.10, 3.8.58, and 3.7.28 on Splunk Cloud Platform.
💻 Affected Systems
- Splunk Enterprise
- Splunk Secure Gateway app
📦 What is this software?
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Client-side DoS affecting user interface functionality for targeted users or groups, potentially disrupting monitoring or management operations.
Likely Case
Limited client-side disruption affecting individual users who encounter the malicious payload, with no server-side impact.
If Mitigated
Minimal impact if proper access controls limit low-privileged user access to device management features.
🎯 Exploit Status
Exploitation requires authenticated low-privileged user access and knowledge of payload crafting.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Splunk Enterprise: 10.0.2, 9.4.6, 9.3.8, 9.2.10; Splunk Secure Gateway app: 3.9.10, 3.8.58, 3.7.28
Vendor Advisory: https://advisory.splunk.com/advisories/SVD-2025-1208
Restart Required: Yes
Instructions:
1. Download appropriate patched version from Splunk website. 2. Backup current installation. 3. Apply patch following Splunk upgrade procedures. 4. Restart Splunk services.
🔧 Temporary Workarounds
Restrict device management access
allLimit low-privileged user access to Splunk Secure Gateway device management features.
splunk edit user <username> -role <restricted_role> -auth admin:changeme
🧯 If You Can't Patch
- Implement strict access controls to prevent low-privileged users from accessing device management in Splunk Secure Gateway.
- Monitor and audit device management activities for suspicious label field entries.
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface (Settings > Server settings) or CLI with 'splunk version', and verify Splunk Secure Gateway app version in Apps management.Check Version:
splunk versionVerify Fix Applied:
Confirm version numbers meet or exceed patched versions: Splunk Enterprise >=10.0.2, 9.4.6, 9.3.8, or 9.2.10; Splunk Secure Gateway app >=3.9.10, 3.8.58, or 3.7.28.📡 Detection & Monitoring
Log Indicators:
- Unusual device additions with malformed label fields in Splunk Secure Gateway logs
- User activity logs showing low-privileged users accessing device management
Network Indicators:
- No specific network indicators as this is client-side
SIEM Query:
index=_internal source=*secure_gateway* "label" | search NOT label="*normal*" | stats count by user, label