CVE-2023-49338
📋 TL;DR
Couchbase Server 7.1.x and 7.2.x before 7.2.4 exposes sensitive admin statistics and vitals endpoints without authentication on localhost port 8093. This allows any local user or process to access detailed system metrics and health information that should be protected. Organizations running affected Couchbase Server versions are vulnerable.
💻 Affected Systems
- Couchbase Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
An attacker with local access could gather detailed system metrics, potentially revealing sensitive information about database performance, configuration, and health that could facilitate further attacks or data exfiltration.
Likely Case
Unauthorized users or malicious processes on the same host could monitor database performance metrics, track system vitals, and gain insights into database operations without authentication.
If Mitigated
With proper network segmentation and local host security controls, the impact is limited to authorized local processes only.
🎯 Exploit Status
Exploitation requires local access to the Couchbase Server host. Attackers can simply curl or access the endpoints without credentials.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.4
Vendor Advisory: https://docs.couchbase.com/server/current/release-notes/relnotes.html
Restart Required: Yes
Instructions:
1. Download Couchbase Server 7.2.4 or later from official sources. 2. Backup your configuration and data. 3. Stop Couchbase Server services. 4. Install the updated version. 5. Restart Couchbase Server services. 6. Verify the update was successful.
🔧 Temporary Workarounds
Localhost Firewall Restriction
linuxBlock unauthorized local access to port 8093 using host firewall rules
iptables -A INPUT -p tcp --dport 8093 -s 127.0.0.1 -j ACCEPT
iptables -A INPUT -p tcp --dport 8093 -j DROP
Network Segmentation
allEnsure Couchbase Server hosts are properly segmented and only authorized processes can access localhost services
🧯 If You Can't Patch
- Implement strict local host security controls to prevent unauthorized local users or processes
- Monitor and audit access to localhost port 8093 for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Run: curl -v http://localhost:8093/admin/stats and check if it returns data without authentication. If it returns HTTP 200 with JSON data, the system is vulnerable.Check Version:
couchbase-server --version or check the web console at http://localhost:8091Verify Fix Applied:
After patching to 7.2.4+, the same curl command should return HTTP 401 Unauthorized or require proper authentication.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to /admin/stats or /admin/vitals endpoints
- Successful access to admin endpoints without authentication logs
Network Indicators:
- Unusual traffic patterns to localhost:8093 from unexpected processes
- Multiple rapid requests to admin endpoints
SIEM Query:
source="couchbase.log" AND (uri_path="/admin/stats" OR uri_path="/admin/vitals") AND http_status=200 AND NOT auth_user=*