CVE-2023-36362
📋 TL;DR
This vulnerability in MonetDB Server's rel_sequences component allows attackers to execute crafted SQL statements that cause a Denial of Service (DoS) by crashing or hanging the database server. It affects MonetDB Server versions 11.45.17 and 11.46.0. Database administrators running these versions are at risk.
💻 Affected Systems
- MonetDB Server
📦 What is this software?
Monetdb by Monetdb
Monetdb by Monetdb
⚠️ Risk & Real-World Impact
Worst Case
Complete database service outage requiring restart, potential data corruption if transactions are interrupted, and extended downtime during recovery.
Likely Case
Temporary database unavailability affecting dependent applications, requiring manual intervention to restart the service.
If Mitigated
Minimal impact with proper network segmentation and monitoring allowing quick detection and recovery.
🎯 Exploit Status
Crafted SQL statements can be sent by any user with database access. No authentication bypass needed if database accepts external connections.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 11.46.0 (check latest release)
Vendor Advisory: https://github.com/MonetDB/MonetDB/issues/7387
Restart Required: Yes
Instructions:
1. Backup database. 2. Stop MonetDB service. 3. Upgrade to patched version. 4. Restart service. 5. Verify functionality.
🔧 Temporary Workarounds
Network Access Restriction
allLimit database access to trusted IPs only to prevent external exploitation
Configure firewall rules to restrict port 50000/tcp (default MonetDB port)
SQL Input Validation
allImplement application-layer validation to filter suspicious SQL patterns
Implement prepared statements and parameterized queries in applications
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit database access
- Deploy monitoring with alerting for unusual SQL patterns or service crashes
🔍 How to Verify
Check if Vulnerable:
Check MonetDB version: mclient --version or SELECT * FROM sys.version();Check Version:
mclient --versionVerify Fix Applied:
Confirm version is newer than 11.46.0 and test with known safe SQL sequences📡 Detection & Monitoring
Log Indicators:
- Database crash logs
- Unusual SQL query patterns targeting rel_sequences
- Service restart events
Network Indicators:
- Multiple SQL connection attempts with crafted sequences
- Traffic spikes to database port
SIEM Query:
source="monetdb.log" AND ("crash" OR "segfault" OR "rel_sequences")