CVE-2025-2534
📋 TL;DR
IBM Db2 databases running vulnerable versions can be crashed by a specially crafted query, causing denial of service. This affects Db2 11.1.0-11.1.4.7, 11.5.0-11.5.9, and 12.1.0-12.1.3 on Linux, UNIX, and Windows systems, including Db2 Connect Server.
💻 Affected Systems
- IBM Db2 Database Server
- 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
Db2 by Ibm
Db2 by Ibm
Db2 by Ibm
⚠️ Risk & Real-World Impact
Worst Case
Complete database unavailability requiring restart, potentially disrupting critical business operations and causing data loss if transactions are interrupted.
Likely Case
Temporary service disruption until database restart, affecting applications dependent on the database.
If Mitigated
Minimal impact with proper network segmentation and query filtering preventing malicious queries from reaching the database.
🎯 Exploit Status
Exploitation requires ability to submit queries to the database, typically requiring some level of database access or application compromise.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fixes from IBM: 11.1.4.7a, 11.5.9a, 12.1.3a or later
Vendor Advisory: https://www.ibm.com/support/pages/node/7250472
Restart Required: Yes
Instructions:
1. Download appropriate fix pack from IBM Fix Central. 2. Apply fix pack following IBM Db2 installation procedures. 3. Restart Db2 instance and verify successful update.
🔧 Temporary Workarounds
Network Access Control
allRestrict database access to only trusted applications and users using firewall rules.
Query Filtering
allImplement application-layer validation to filter or sanitize database queries before submission.
🧯 If You Can't Patch
- Implement strict network segmentation to limit database access to only necessary applications
- Monitor database logs for unusual query patterns and implement rate limiting on database connections
🔍 How to Verify
Check if Vulnerable:
Check Db2 version using 'db2level' command and compare against affected version ranges.Check Version:
db2level | grep "Product installed"Verify Fix Applied:
Verify version after patching shows patched version (e.g., 11.5.9a) and test database stability with normal queries.📡 Detection & Monitoring
Log Indicators:
- Database crash logs
- Unexpected termination of db2sysc process
- Connection failures following unusual queries
Network Indicators:
- Multiple failed connection attempts to database port
- Unusual query patterns from single source
SIEM Query:
source="db2*" AND ("crash" OR "terminated" OR "abnormal")