CVE-2025-36424
📋 TL;DR
This vulnerability in IBM Db2 allows authenticated users to cause denial of service by submitting specially crafted queries that trigger improper neutralization of special elements. It affects Db2 for Linux, UNIX and Windows including Db2 Connect Server. Attackers could crash database services, disrupting business operations.
💻 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 outage affecting all applications dependent on Db2, potentially requiring manual restart and causing extended downtime.
Likely Case
Partial service disruption affecting specific database connections or queries, with automatic recovery possible but causing intermittent availability issues.
If Mitigated
Minimal impact with proper query validation and monitoring in place, potentially causing only temporary connection drops.
🎯 Exploit Status
Exploitation requires authenticated database access but the vulnerability itself is in core query processing logic.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check IBM advisory for specific fixed versions
Vendor Advisory: https://www.ibm.com/support/pages/node/7257695
Restart Required: Yes
Instructions:
1. Review IBM advisory for affected versions. 2. Download appropriate fix pack from IBM Fix Central. 3. Apply fix pack following IBM documentation. 4. Restart Db2 services. 5. Verify patch application.
🔧 Temporary Workarounds
Restrict Database Privileges
allLimit query execution privileges to only necessary users and applications
db2 "REVOKE EXECUTE ON PROCEDURE <procedure_name> FROM <user>"
db2 "REVOKE SELECT, INSERT, UPDATE, DELETE ON <table> FROM <user>"
Implement Query Monitoring
allMonitor and alert on unusual query patterns that could trigger the vulnerability
db2pd -db <dbname> -dynamic
db2 "SELECT * FROM TABLE(MON_GET_PKG_CACHE_STMT(NULL, NULL, -2)) WHERE EXECUTABLE_ID LIKE '%suspicious_pattern%'"
🧯 If You Can't Patch
- Implement strict input validation and parameterized queries in all applications accessing Db2
- Deploy network segmentation and firewall rules to limit Db2 access to only authorized applications and users
🔍 How to Verify
Check if Vulnerable:
Check Db2 version against IBM advisory: db2level command outputCheck Version:
db2level | grep "Product installed"Verify Fix Applied:
Verify version after patching: db2level should show patched version📡 Detection & Monitoring
Log Indicators:
- Unexpected database crashes or restarts in db2diag.log
- Error messages related to query processing or memory corruption
- Multiple failed connection attempts followed by service disruption
Network Indicators:
- Sudden drop in database connections
- Increased error responses from database port
- Unusual query patterns from single source
SIEM Query:
source="db2diag.log" AND ("crash" OR "abend" OR "segmentation fault" OR "access violation")