CVE-2021-22148
📋 TL;DR
This vulnerability in Elastic Enterprise Search App Search allows API keys to access engines beyond their intended scope. A less privileged user could gain unauthorized access to engines they shouldn't have permissions for. This affects all Elastic Enterprise Search App Search versions before 7.14.0.
💻 Affected Systems
- Elastic Enterprise Search App Search
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Privilege escalation leading to unauthorized access to sensitive data across all engines, potentially resulting in data exfiltration or manipulation.
Likely Case
Unauthorized access to some engines beyond user's intended permissions, potentially exposing sensitive business data.
If Mitigated
Limited impact with proper access controls and monitoring, but still represents a privilege escalation risk.
🎯 Exploit Status
Exploitation requires valid API key credentials but minimal technical skill to abuse the misconfigured permissions.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.14.0 and later
Vendor Advisory: https://discuss.elastic.co/t/elastic-stack-7-14-0-security-update/280344
Restart Required: Yes
Instructions:
1. Backup your configuration and data. 2. Upgrade Elastic Enterprise Search App Search to version 7.14.0 or later. 3. Restart the service. 4. Regenerate all API keys to ensure proper engine binding.
🔧 Temporary Workarounds
API Key Rotation
allRegularly rotate all API keys to limit exposure window
curl -X POST -H "Authorization: Bearer <admin_token>" https://<appsearch_host>:<port>/api/as/v1/credentials/<key_id>/regenerate
🧯 If You Can't Patch
- Implement strict network segmentation to limit access to App Search instances
- Enforce principle of least privilege and monitor all API key usage patterns
🔍 How to Verify
Check if Vulnerable:
Check App Search version via API: curl -X GET https://<appsearch_host>:<port>/api/as/v1/enginesCheck Version:
curl -X GET https://<appsearch_host>:<port>/api/as/v1/engines | grep versionVerify Fix Applied:
Verify version is 7.14.0 or later and test API key permissions are properly scoped to intended engines📡 Detection & Monitoring
Log Indicators:
- API key accessing multiple engines in short timeframes
- Unusual engine access patterns from single API key
Network Indicators:
- Multiple engine API calls from single source in rapid succession
SIEM Query:
source="appsearch" AND ("engine" OR "api_key") | stats count by src_ip, api_key, engine