CVE-2025-36008
📋 TL;DR
This vulnerability in IBM Db2 allows authenticated users to cause denial of service by exploiting improper resource allocation. It affects Db2 versions 11.5.0-11.5.9 and 12.1.0-12.1.3 on Linux, UNIX, and Windows systems, including Db2 Connect Server installations.
💻 Affected Systems
- IBM Db2
- 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 unavailability affecting all dependent applications and services
Likely Case
Degraded database performance or temporary service interruptions
If Mitigated
Minimal impact with proper resource monitoring and user privilege restrictions
🎯 Exploit Status
Requires authenticated database user access; exploitation likely involves specific queries or operations that trigger resource exhaustion
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply fixes from IBM security bulletin
Vendor Advisory: https://www.ibm.com/support/pages/node/7250482
Restart Required: Yes
Instructions:
1. Review IBM security advisory 2. Apply appropriate fix pack or interim fix 3. Restart Db2 instance 4. Verify fix application
🔧 Temporary Workarounds
Restrict User Privileges
allLimit database user permissions to reduce attack surface
REVOKE EXECUTE ON PROCEDURE <procedure_name> FROM <user>
REVOKE CONNECT ON DATABASE FROM <user>
Implement Resource Limits
allConfigure database resource limits to prevent excessive allocation
UPDATE DATABASE CONFIGURATION USING <resource_limit_parameter> <value>
🧯 If You Can't Patch
- Implement strict access controls and least privilege principles for all database users
- Deploy monitoring for abnormal resource consumption patterns and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check Db2 version using 'db2level' command and compare against affected versionsCheck Version:
db2level | grep "Product installed"Verify Fix Applied:
Verify applied fix version matches or exceeds patched versions in IBM advisory📡 Detection & Monitoring
Log Indicators:
- Abnormal resource allocation errors in db2diag.log
- Unexpected database termination or restart events
- High memory/CPU consumption alerts
Network Indicators:
- Increased failed connection attempts to Db2
- Abnormal query patterns from authenticated users
SIEM Query:
source="db2diag.log" AND ("resource allocation" OR "out of memory" OR "denial of service")