CVE-2025-36116
📋 TL;DR
IBM Db2 Mirror for i GUI has a cross-site WebSocket hijacking vulnerability that allows unauthenticated attackers to intercept WebSocket connections. This could let attackers perform unauthorized operations by impersonating legitimate users. Affects Db2 Mirror for i versions 7.4, 7.5, and 7.6.
💻 Affected Systems
- IBM Db2 Mirror for i
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain unauthorized administrative access to Db2 Mirror systems, potentially compromising data integrity, availability, and confidentiality across mirrored databases.
Likely Case
Attackers perform unauthorized operations within the user's privilege level, potentially modifying configurations, accessing sensitive data, or disrupting mirroring operations.
If Mitigated
With proper WebSocket security controls and network segmentation, impact is limited to isolated GUI sessions without database access.
🎯 Exploit Status
Requires attacker to craft malicious requests and have access to WebSocket endpoints.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply IBM fix as per advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/7240351
Restart Required: Yes
Instructions:
1. Review IBM advisory 7240351
2. Apply IBM-provided fix for affected Db2 Mirror versions
3. Restart Db2 Mirror services
4. Verify fix implementation
🔧 Temporary Workarounds
Restrict WebSocket Access
allLimit network access to Db2 Mirror GUI WebSocket endpoints
Configure firewall rules to restrict WebSocket port access to trusted IPs only
Disable Unused GUI Features
IBM iDisable WebSocket functionality if not required
Consult IBM documentation for disabling specific GUI WebSocket features
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Db2 Mirror GUI from untrusted networks
- Deploy Web Application Firewall (WAF) with WebSocket protection rules
🔍 How to Verify
Check if Vulnerable:
Check if running affected Db2 Mirror versions 7.4, 7.5, or 7.6 without IBM's security fixCheck Version:
IBM i command: WRKACTJOB to check Db2 Mirror processes and versionsVerify Fix Applied:
Verify fix applied by checking version and consulting IBM fix verification steps📡 Detection & Monitoring
Log Indicators:
- Unusual WebSocket connection patterns
- Failed authentication attempts to WebSocket endpoints
- Unexpected GUI operations from unusual IPs
Network Indicators:
- Malformed WebSocket handshake requests
- Cross-origin WebSocket connections to Db2 Mirror GUI
SIEM Query:
source="db2_mirror_logs" AND (event="websocket_hijack" OR event="unauthorized_gui_operation")