CVE-2024-37034
📋 TL;DR
CVE-2024-37034 is an authentication bypass vulnerability in Couchbase Server where credentials may not be properly negotiated with SCRAM-SHA encryption when remote link encryption is configured for Half-Secure mode. This affects Couchbase Server deployments using Half-Secure remote link encryption configuration. Attackers could potentially bypass authentication mechanisms.
💻 Affected Systems
- Couchbase Server
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Unauthenticated attackers could gain unauthorized access to Couchbase Server KV service, potentially leading to data exposure, modification, or deletion.
Likely Case
Attackers with network access could bypass authentication to access Key-Value service data they shouldn't have access to.
If Mitigated
With proper network segmentation and access controls, impact is limited to authorized network segments only.
🎯 Exploit Status
Exploitation requires network access to Couchbase Server and Half-Secure remote link encryption configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.2.5 or 7.6.1
Vendor Advisory: https://www.couchbase.com/alerts/
Restart Required: Yes
Instructions:
1. Download Couchbase Server version 7.2.5 or 7.6.1 from official sources. 2. Backup all data and configurations. 3. Stop Couchbase Server services. 4. Install the updated version. 5. Restart Couchbase Server services. 6. Verify functionality.
🔧 Temporary Workarounds
Disable Half-Secure Remote Link Encryption
allChange remote link encryption configuration from Half-Secure to either Off or Full-Secure mode
couchbase-cli setting-cluster -c localhost:8091 -u Administrator -p password --cluster-encryption-level off
Implement Network Segmentation
allRestrict network access to Couchbase Server to only trusted systems
🧯 If You Can't Patch
- Change remote link encryption from Half-Secure to Full-Secure or Off mode
- Implement strict network access controls and firewall rules to limit access to Couchbase Server
🔍 How to Verify
Check if Vulnerable:
Check Couchbase Server version and remote link encryption configuration: 1. Check version with 'couchbase-server --version'. 2. Check cluster encryption setting via web console or CLI.Check Version:
couchbase-server --versionVerify Fix Applied:
Verify version is 7.2.5 or higher, or 7.6.1 or higher, and confirm remote link encryption is properly configured.📡 Detection & Monitoring
Log Indicators:
- Unauthorized authentication attempts to KV service
- Unexpected connections to Couchbase Server ports
Network Indicators:
- Unencrypted or improperly encrypted traffic to Couchbase Server KV service ports
- Traffic patterns indicating authentication bypass attempts
SIEM Query:
source="couchbase" AND (event_type="authentication_failure" OR event_type="unauthorized_access")