CVE-2024-41744
📋 TL;DR
IBM CICS TX Standard 11.1 has a cross-site request forgery (CSRF) vulnerability that allows attackers to trick authenticated users into performing unauthorized actions. This affects organizations using IBM CICS TX Standard 11.1 web interfaces where users have administrative or privileged access.
💻 Affected Systems
- IBM CICS TX Standard
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could perform administrative actions like creating new users, changing configurations, or executing arbitrary commands with the victim's privileges.
Likely Case
Attackers could modify application settings, access sensitive data, or perform limited administrative functions through authenticated user sessions.
If Mitigated
With proper CSRF protections and least privilege access, impact is limited to actions within the user's existing permissions.
🎯 Exploit Status
CSRF attacks are well-understood and relatively easy to execute once the vulnerable endpoint is identified. Requires user interaction (clicking malicious link).
🛠️ 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/7174576
Restart Required: Yes
Instructions:
1. Review IBM advisory for specific patch details
2. Apply interim fix or upgrade to patched version
3. Restart CICS TX services
4. Verify CSRF protections are enabled
🔧 Temporary Workarounds
Implement CSRF Tokens
allAdd anti-CSRF tokens to all state-changing requests
Configuration through CICS TX administration interface
SameSite Cookie Attribute
allSet SameSite=Strict or SameSite=Lax on session cookies
Configure in web server or application server settings
🧯 If You Can't Patch
- Implement web application firewall with CSRF protection rules
- Restrict administrative access to internal networks only
- Use separate browser sessions for administrative tasks
- Educate users about phishing and suspicious links
🔍 How to Verify
Check if Vulnerable:
Check if CSRF tokens are missing from forms and state-changing requests in the web interfaceCheck Version:
Check CICS TX version through administration console or product documentationVerify Fix Applied:
Test that all forms include unique CSRF tokens and validate them server-side📡 Detection & Monitoring
Log Indicators:
- Multiple state-changing requests from same user without CSRF tokens
- Unusual administrative actions from unexpected IP addresses
- Requests with missing or invalid anti-CSRF headers
Network Indicators:
- External requests to administrative endpoints with referrer headers from suspicious domains
- POST requests without expected CSRF token parameters
SIEM Query:
source="cics_tx_logs" AND (action="admin_change" OR action="config_modify") AND csrf_token="null"