CVE-2025-23225
📋 TL;DR
This vulnerability in IBM MQ allows authenticated users to send specially crafted messages with invalid headers to queues, causing the queue manager to crash and resulting in denial of service. It affects IBM MQ versions 9.3 LTS, 9.3 CD, 9.4 LTS, and 9.4 CD. The vulnerability requires authentication but no special privileges.
💻 Affected Systems
- IBM MQ
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete service outage of IBM MQ queue manager, disrupting all message processing and dependent applications until manual restart.
Likely Case
Targeted DoS attacks against specific queues, causing service disruption for affected applications and requiring queue manager restart.
If Mitigated
Minimal impact with proper authentication controls, monitoring, and rapid incident response capabilities.
🎯 Exploit Status
Exploitation requires valid authentication credentials and knowledge of queue names. The attack involves sending malformed messages to queues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply the latest fix packs for affected versions as specified in IBM advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/7183372
Restart Required: Yes
Instructions:
1. Review IBM advisory for specific fix pack versions. 2. Download appropriate fix pack from IBM Fix Central. 3. Apply fix pack following IBM installation procedures. 4. Restart queue manager and verify functionality.
🔧 Temporary Workarounds
Restrict Queue Access
allLimit which authenticated users can write to queues to reduce attack surface
ALTER QMGR CHLAUTH(DISABLED)
SET CHLAUTH('*') TYPE(BLOCKUSER) USERLIST('*NOACCESS')
SET CHLAUTH('*') TYPE(ADDRESSMAP) ADDRESS('*') USERSRC(NOACCESS)
Implement Message Validation
allUse exit programs to validate message headers before processing
DEFINE EXIT('header_validation_exit') EXITDATA('')
ALTER QMGR EXITPROG('header_validation_exit')
🧯 If You Can't Patch
- Implement strict authentication controls and monitor for unusual message patterns
- Deploy network segmentation to isolate IBM MQ from untrusted networks and users
🔍 How to Verify
Check if Vulnerable:
Check IBM MQ version using 'dspmqver' command and compare against affected versions listCheck Version:
dspmqverVerify Fix Applied:
Verify fix pack installation using 'dspmqver' and confirm version is no longer in affected range📡 Detection & Monitoring
Log Indicators:
- Queue manager crash logs
- AMQERR01.LOG entries showing abnormal termination
- Error messages related to message header processing
Network Indicators:
- Unusual patterns of messages to queues from single sources
- Multiple connection attempts followed by service disruption
SIEM Query:
source="IBM_MQ" AND (event_type="crash" OR error_message="*header*" OR error_message="*invalid*")