CVE-2022-26889
📋 TL;DR
This path traversal vulnerability in Splunk Enterprise allows attackers to inject arbitrary content into web pages or bypass SPL command safeguards. It affects Splunk Enterprise versions before 8.1.2 and requires the attacker to initiate a request within the victim's browser, typically through phishing.
💻 Affected Systems
- Splunk Enterprise
📦 What is this software?
Splunk by Splunk
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of Splunk instance through HTML injection/XSS leading to credential theft, data exfiltration, or execution of risky SPL commands.
Likely Case
Limited HTML injection or XSS attacks leading to session hijacking, data manipulation, or bypassing SPL safeguards for specific commands.
If Mitigated
Minimal impact if proper web application firewalls, input validation, and user awareness training are implemented.
🎯 Exploit Status
Exploitation requires user interaction (phishing) and web interface access. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 8.1.2 or later
Vendor Advisory: https://www.splunk.com/en_us/product-security/announcements/svd-2022-0506.html
Restart Required: Yes
Instructions:
1. Backup Splunk configuration and data. 2. Download Splunk Enterprise 8.1.2 or later from Splunk website. 3. Stop Splunk services. 4. Install the update following Splunk upgrade documentation. 5. Restart Splunk services. 6. Verify version and functionality.
🔧 Temporary Workarounds
Restrict Web Interface Access
allLimit access to Splunk web interface to trusted networks only using firewall rules.
Implement WAF Rules
allConfigure web application firewall to block path traversal patterns and suspicious URI requests.
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Splunk instances
- Enable multi-factor authentication and user awareness training against phishing
🔍 How to Verify
Check if Vulnerable:
Check Splunk version via web interface or command line. If version is below 8.1.2, system is vulnerable.Check Version:
splunk versionVerify Fix Applied:
Verify Splunk version is 8.1.2 or higher and test web interface functionality.📡 Detection & Monitoring
Log Indicators:
- Unusual URI patterns with path traversal sequences
- Multiple failed login attempts followed by suspicious URI requests
Network Indicators:
- HTTP requests containing '../' or similar path traversal patterns to Splunk web interface
SIEM Query:
source="*splunk*" (uri="*../*" OR uri="*..\\*" OR uri="*%2e%2e%2f*")