CVE-2025-3050
📋 TL;DR
This vulnerability in IBM Db2 allows authenticated users to cause denial of service through CPU resource exhaustion when using Q replication. It affects Db2 versions 11.5.0-11.5.9 and 12.1.0-12.1.1 on Linux, UNIX, and Windows systems. The impact is limited to availability degradation rather than data compromise.
💻 Affected Systems
- IBM Db2 for Linux, UNIX and Windows
- 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 service unavailability for Db2 databases using Q replication, potentially affecting critical business applications and causing extended downtime.
Likely Case
Performance degradation and intermittent service disruptions for databases with Q replication enabled, requiring restart of affected Db2 instances.
If Mitigated
Minimal impact with proper access controls limiting authenticated users and monitoring systems detecting abnormal CPU usage patterns.
🎯 Exploit Status
Exploitation requires authenticated database access and Q replication privileges. The vulnerability is triggered through normal Q replication operations that improperly allocate CPU resources.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fix packs: 11.5.9.0 Fix Pack 1 or later for 11.5.x, 12.1.1.0 Fix Pack 1 or later for 12.1.x
Vendor Advisory: https://www.ibm.com/support/pages/node/7235073
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 instructions. 4. Restart Db2 services. 5. Verify version update.
🔧 Temporary Workarounds
Disable Q Replication
allTemporarily disable Q replication feature if not required for operations
db2stop
Modify database configuration to disable Q replication
db2start
Restrict Q Replication Access
allLimit database users who have Q replication privileges to essential personnel only
REVOKE Q REPLICATION PRIVILEGES FROM non-essential-users
🧯 If You Can't Patch
- Implement strict access controls to limit authenticated users with Q replication privileges
- Monitor CPU usage patterns and set alerts for abnormal Q replication resource consumption
🔍 How to Verify
Check if Vulnerable:
Check Db2 version with 'db2level' command and verify if Q replication is enabled in database configurationCheck Version:
db2levelVerify Fix Applied:
Verify version after patching with 'db2level' and confirm it matches patched versions: 11.5.9.0 Fix Pack 1+ or 12.1.1.0 Fix Pack 1+📡 Detection & Monitoring
Log Indicators:
- Abnormal CPU usage spikes in Db2 process logs
- Q replication process failures or restarts
- Database connection timeouts
Network Indicators:
- Increased latency for database queries
- Timeout errors from applications connecting to Db2
SIEM Query:
source="db2*" AND ("CPU" OR "resource" OR "Q replication") AND ("high" OR "spike" OR "exhaustion")