CVE-2023-25016
📋 TL;DR
Couchbase Server versions before 6.6.6, 7.0.5, and 7.1.2 expose sensitive information to unauthorized actors. This vulnerability allows attackers to access confidential data without proper authentication. Organizations running affected Couchbase Server versions are at risk.
💻 Affected Systems
- Couchbase Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized access to sensitive data stored in Couchbase Server, potentially including credentials, personal information, or business-critical data, leading to data breaches and compliance violations.
Likely Case
Unauthorized actors access configuration details, metadata, or limited sensitive information that could facilitate further attacks or reconnaissance.
If Mitigated
With proper network segmentation and access controls, exposure is limited to authorized internal systems only, reducing the attack surface.
🎯 Exploit Status
The vulnerability involves exposure of sensitive information without authentication, suggesting straightforward exploitation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 6.6.6, 7.0.5, or 7.1.2
Vendor Advisory: https://docs.couchbase.com/server/current/release-notes/relnotes.html
Restart Required: Yes
Instructions:
1. Download the patched version from Couchbase official site. 2. Backup your data and configuration. 3. Stop Couchbase Server. 4. Install the patched version. 5. Restart Couchbase Server. 6. Verify the upgrade was successful.
🔧 Temporary Workarounds
Network Access Restriction
allRestrict network access to Couchbase Server to only trusted IP addresses and networks.
Use firewall rules (e.g., iptables, Windows Firewall) to limit inbound connections to Couchbase ports (default 8091, 11210, etc.)
Enable TLS Encryption
allEnforce TLS encryption for all client-server communications to protect data in transit.
Configure Couchbase Server to require TLS and disable plaintext protocols
🧯 If You Can't Patch
- Isolate Couchbase Server behind a firewall with strict access controls, allowing only necessary internal traffic.
- Implement network segmentation to separate Couchbase Server from untrusted networks and monitor for unusual access patterns.
🔍 How to Verify
Check if Vulnerable:
Check the Couchbase Server version via the web console (port 8091) or command line. If version is below 6.6.6, 7.0.5, or 7.1.2, it is vulnerable.Check Version:
couchbase-server --version (Linux) or check via web interface at http://localhost:8091Verify Fix Applied:
After patching, verify the version is 6.6.6, 7.0.5, or 7.1.2 or higher using the same method.📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to Couchbase Server logs, especially from unauthorized IP addresses
- Log entries indicating access to sensitive endpoints without authentication
Network Indicators:
- Unexpected traffic to Couchbase Server ports (default 8091, 11210) from external or untrusted sources
SIEM Query:
source="couchbase.log" AND (event="unauthorized_access" OR src_ip NOT IN trusted_networks)