CVE-2025-1329
📋 TL;DR
This vulnerability allows a local user to execute arbitrary code on IBM CICS TX systems due to improper handling of DNS return requests by the gethostbyaddr function. It affects IBM CICS TX Standard 11.1 and IBM CICS TX Advanced 10.1 and 11.1. Attackers could potentially gain full system control.
💻 Affected Systems
- IBM CICS TX Standard
- IBM CICS TX Advanced
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Local attacker gains full system control, executes arbitrary code with system privileges, potentially compromising the entire CICS TX environment and underlying operating system.
Likely Case
Local authenticated user escalates privileges to execute arbitrary code, potentially gaining unauthorized access to sensitive data or disrupting CICS TX operations.
If Mitigated
With proper access controls and network segmentation, impact is limited to the affected CICS TX instance only.
🎯 Exploit Status
Exploitation requires local access to the system and knowledge of the vulnerability. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply IBM security updates as specified in vendor advisories
Vendor Advisory: https://www.ibm.com/support/pages/node/7232923
Restart Required: Yes
Instructions:
1. Review IBM security advisories 2. Download appropriate patches from IBM Fix Central 3. Apply patches following IBM documentation 4. Restart CICS TX services 5. Verify patch application
🔧 Temporary Workarounds
Restrict Local Access
allLimit local user access to CICS TX systems to only authorized administrators
Review and tighten local user permissions
Implement least privilege access controls
Network Segmentation
allIsolate CICS TX systems from general user networks
Implement firewall rules to restrict access
Segment CICS TX systems in separate network zones
🧯 If You Can't Patch
- Implement strict access controls to limit local user access to CICS TX systems
- Monitor system logs for suspicious activity and implement intrusion detection
🔍 How to Verify
Check if Vulnerable:
Check CICS TX version using 'cicscli version' or review installation logs. Compare against affected versions: Standard 11.1, Advanced 10.1, Advanced 11.1.Check Version:
cicscli versionVerify Fix Applied:
Verify patch application by checking version after update and confirming no security alerts from IBM. Review system logs for successful patch installation.📡 Detection & Monitoring
Log Indicators:
- Unusual DNS resolution patterns
- Suspicious local user activity
- Unexpected process execution from CICS TX context
Network Indicators:
- Abnormal DNS queries from CICS TX systems
- Unexpected outbound connections from CICS TX
SIEM Query:
source="cics_tx_logs" AND (event_type="dns_error" OR event_type="privilege_escalation")