CVE-2025-36407
📋 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 Db2 versions 11.5.0-11.5.9 and 12.1.0-12.1.3 on Linux, UNIX, and Windows systems. The attacker must have local access to the database server.
💻 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
Db2 by Ibm
Db2 by Ibm
Db2 by Ibm
⚠️ Risk & Real-World Impact
Worst Case
Complete database service disruption affecting all applications and users relying on the Db2 instance, potentially requiring system restart.
Likely Case
Temporary service degradation or crash of specific database processes, affecting availability for some users until service is restored.
If Mitigated
Minimal impact with proper access controls limiting local user privileges and monitoring for abnormal query patterns.
🎯 Exploit Status
Exploitation requires local access and database user privileges. The CWE-1284 suggests improper input validation in query processing.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fixes from IBM Security Bulletin: 11.5.9.0 Fix Pack 10 or later, 12.1.3.0 Fix Pack 4 or later
Vendor Advisory: https://www.ibm.com/support/pages/node/7257692
Restart Required: Yes
Instructions:
1. Download appropriate fix pack from IBM Fix Central. 2. Stop all Db2 services. 3. Apply fix pack following IBM installation guide. 4. Restart Db2 services. 5. Verify version update.
🔧 Temporary Workarounds
Restrict Local User Access
allLimit local user accounts with database access to only trusted administrators
# Review and remove unnecessary local database users
# Use OS-level access controls to restrict who can run database commands
Implement Query Monitoring
allMonitor for abnormal query patterns that could indicate exploitation attempts
# Enable Db2 audit logging for query execution
# Set up alerts for unusual query patterns or frequency
🧯 If You Can't Patch
- Implement strict least-privilege access controls for local database users
- Deploy additional monitoring for database service availability and restart procedures
🔍 How to Verify
Check if Vulnerable:
Check Db2 version using 'db2level' command and compare against affected versions 11.5.0-11.5.9 or 12.1.0-12.1.3Check Version:
db2level | grep "Product installed"Verify Fix Applied:
Run 'db2level' command and verify version is 11.5.9.0 Fix Pack 10 or later, or 12.1.3.0 Fix Pack 4 or later📡 Detection & Monitoring
Log Indicators:
- Database service crashes or restarts
- Abnormal query patterns in Db2 diagnostic logs
- Error messages related to query processing failures
Network Indicators:
- Sudden loss of database connectivity from applications
- Increased failed connection attempts to database
SIEM Query:
source="db2*" AND ("crash" OR "restart" OR "abnormal query" OR "service terminated")