CVE-2025-1331
📋 TL;DR
This vulnerability in IBM CICS TX products allows local users to execute arbitrary code on the system due to unsafe use of the gets() function, which can lead to buffer overflow attacks. Affected systems include IBM CICS TX Standard 11.1 and IBM CICS TX Advanced 10.1 and 11.1.
💻 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 compromise with root/admin privileges, allowing data theft, system destruction, or lateral movement.
Likely Case
Local user escalates privileges to execute arbitrary code within the CICS TX process context, potentially compromising sensitive transaction data.
If Mitigated
With proper access controls and least privilege, impact limited to local user's own permissions.
🎯 Exploit Status
Exploitation requires local access but leverages well-known buffer overflow techniques via gets() function.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply interim fixes as specified in IBM advisories
Vendor Advisory: https://www.ibm.com/support/pages/node/7232923
Restart Required: Yes
Instructions:
1. Review IBM advisories for specific interim fixes. 2. Apply appropriate interim fix for your version. 3. Restart affected CICS TX services. 4. Verify fix applied successfully.
🔧 Temporary Workarounds
Restrict local user access
allLimit local user accounts that can access CICS TX systems to reduce attack surface
Implement least privilege
allEnsure CICS TX processes run with minimal necessary privileges
🧯 If You Can't Patch
- Isolate affected systems from critical network segments
- Implement strict access controls and monitoring for local user activity
🔍 How to Verify
Check if Vulnerable:
Check CICS TX version against affected versions: 11.1 for Standard, 10.1 or 11.1 for AdvancedCheck Version:
Consult IBM documentation for version check commands specific to your installationVerify Fix Applied:
Verify interim fix applied by checking version/patch level against IBM advisory📡 Detection & Monitoring
Log Indicators:
- Unusual process execution from CICS TX context
- Buffer overflow attempts in application logs
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
Process execution from CICS TX with unusual parent processes or privilege escalation