CVE-2025-36423
📋 TL;DR
This vulnerability in IBM Db2 allows a local user to cause a denial of service by exploiting improper neutralization of special elements in data query logic. It affects IBM Db2 for Linux, UNIX and Windows (including Db2 Connect Server) versions 12.1.0 through 12.1.3. The attacker must have local access to the system.
💻 Affected Systems
- IBM Db2 for Linux, UNIX and Windows
- IBM Db2 Connect Server
📦 What is this software?
Db2 by Ibm
Db2 by Ibm
Db2 by Ibm
⚠️ Risk & Real-World Impact
Worst Case
Complete database service disruption leading to application downtime and business impact
Likely Case
Temporary database service interruption affecting dependent applications
If Mitigated
Minimal impact with proper access controls and monitoring
🎯 Exploit Status
Requires local user access and knowledge of database query logic. No public exploit code available at this time.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fix pack 12.1.4 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/7257694
Restart Required: Yes
Instructions:
1. Download the appropriate fix pack from IBM Fix Central. 2. Stop all Db2 services. 3. Apply the fix pack according to IBM documentation. 4. Restart Db2 services. 5. Verify the update was successful.
🔧 Temporary Workarounds
Restrict local user access
allLimit local user accounts that have access to Db2 instance
# Review and remove unnecessary local user accounts
# Implement least privilege access controls
Implement query monitoring
allMonitor and alert on unusual query patterns
# Configure Db2 audit policies for query monitoring
# Set up alerts for abnormal query behavior
🧯 If You Can't Patch
- Implement strict access controls to limit local user access to Db2 instances
- Deploy additional monitoring and alerting for database service disruptions
🔍 How to Verify
Check if Vulnerable:
Check Db2 version using db2level command and compare against affected versions 12.1.0-12.1.3Check Version:
db2level | grep "Product name"Verify Fix Applied:
Verify version is 12.1.4 or later using db2level command and check that the fix pack was successfully applied📡 Detection & Monitoring
Log Indicators:
- Database service crashes
- Abnormal query patterns
- Connection failures
- Resource exhaustion events
Network Indicators:
- Increased failed connection attempts
- Unusual query traffic patterns
SIEM Query:
source="db2*" AND (event_type="crash" OR event_type="service_stop" OR query="*special*" OR error="*denial*")