CVE-2023-36364
📋 TL;DR
This vulnerability in MonetDB Server's rel_deps component allows attackers to execute crafted SQL statements that cause a Denial of Service (DoS) by crashing the database server. It affects MonetDB Server versions 11.45.17 and 11.46.0. Database administrators and organizations running these vulnerable 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 disruption requiring manual restart, potential data corruption if transactions are interrupted, and extended downtime affecting all dependent applications.
Likely Case
Database server crashes under specific malicious SQL queries, causing temporary service unavailability until manual restart, impacting application functionality.
If Mitigated
Minimal impact with proper network segmentation, query validation, and monitoring allowing quick detection and recovery.
🎯 Exploit Status
Exploitation requires database authentication but uses standard SQL injection techniques. No public exploit code has been released.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Versions after 11.46.0 (check latest release)
Vendor Advisory: https://github.com/MonetDB/MonetDB/issues/7386
Restart Required: Yes
Instructions:
1. Backup database and configuration. 2. Stop MonetDB service. 3. Upgrade to latest patched version. 4. Restart MonetDB service. 5. Verify functionality.
🔧 Temporary Workarounds
SQL Query Filtering
allImplement input validation and filtering for SQL queries to block crafted statements targeting rel_deps component.
-- Application-level: Validate all user inputs
-- Database-level: Use prepared statements with parameterized queries
Network Access Restriction
linuxRestrict database access to only trusted application servers and administrators.
iptables -A INPUT -p tcp --dport 50000 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 50000 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate MonetDB servers from untrusted networks
- Deploy Web Application Firewall (WAF) or database firewall with SQL injection detection rules
🔍 How to Verify
Check if Vulnerable:
Check MonetDB version: mclient --version or SELECT * FROM sys.version(); If version is 11.45.17 or 11.46.0, system is vulnerable.Check Version:
mclient --version 2>/dev/null || echo 'SELECT * FROM sys.version();' | mclient -d database_nameVerify Fix Applied:
After upgrade, verify version is newer than 11.46.0 and test database functionality with normal queries.📡 Detection & Monitoring
Log Indicators:
- Database crash logs
- Unexpected service restarts
- Error messages containing 'rel_deps' or segmentation faults
Network Indicators:
- Unusual SQL query patterns from single source
- Multiple connection attempts with crafted queries
SIEM Query:
source="monetdb.log" AND ("segmentation fault" OR "rel_deps" OR "unexpected shutdown")