CVE-2024-41746
📋 TL;DR
IBM CICS TX Advanced and Standard are vulnerable to stored cross-site scripting (XSS) that allows authenticated users to inject malicious JavaScript into the Web UI. This can lead to session hijacking or credential theft when other users view the compromised interface. Affected versions include CICS TX Advanced 10.1, 11.1 and Standard 11.1.
💻 Affected Systems
- IBM CICS TX Advanced
- IBM CICS TX Standard
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal administrator credentials, gain full system access, and compromise sensitive data or execute unauthorized transactions.
Likely Case
Attackers steal user session cookies or credentials, leading to unauthorized access to business applications and potential data exfiltration.
If Mitigated
Limited impact with proper input validation and output encoding, though some UI manipulation may still occur.
🎯 Exploit Status
Exploitation requires authenticated access and knowledge of the Web UI interface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply interim fix or upgrade as specified in IBM advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/7171873
Restart Required: No
Instructions:
1. Review IBM advisory for specific interim fixes. 2. Apply the recommended fix for your version. 3. Verify the fix by testing XSS payloads in the Web UI.
🔧 Temporary Workarounds
Input Validation and Output Encoding
allImplement server-side validation and proper output encoding for all user inputs in the Web UI.
Content Security Policy
allImplement a strict Content Security Policy to restrict script execution.
🧯 If You Can't Patch
- Restrict Web UI access to trusted users only using network segmentation and authentication controls.
- Implement web application firewall rules to detect and block XSS payloads.
🔍 How to Verify
Check if Vulnerable:
Test by attempting to inject basic XSS payloads (e.g., <script>alert('test')</script>) into Web UI input fields and check if they execute.Check Version:
Check CICS TX version via administrative console or product documentation.Verify Fix Applied:
Retest XSS payloads after applying patches; they should be properly sanitized and not execute.📡 Detection & Monitoring
Log Indicators:
- Unusual JavaScript or HTML patterns in Web UI access logs
- Multiple failed login attempts followed by successful access
Network Indicators:
- HTTP requests containing suspicious script tags or JavaScript code to CICS TX endpoints
SIEM Query:
source="cics_tx_logs" AND ("<script>" OR "javascript:" OR "onerror=" OR "onload=")