CVE-2020-4942
📋 TL;DR
This CSRF vulnerability in IBM Curam Social Program Management allows attackers to trick authenticated users into performing unauthorized actions on their behalf. It affects IBM Curam Social Program Management versions 7.0.9 and 7.0.11. Attackers could modify user data, change permissions, or perform other malicious actions through the victim's authenticated session.
💻 Affected Systems
- IBM Curam Social Program Management
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete account takeover, unauthorized data modification, privilege escalation, or administrative actions performed by attackers through victim sessions.
Likely Case
Unauthorized data modification, account settings changes, or fraudulent transactions initiated through authenticated user sessions.
If Mitigated
Limited impact with proper CSRF protections, though some risk remains if other vulnerabilities exist.
🎯 Exploit Status
Exploitation requires tricking authenticated users into visiting malicious pages or clicking malicious links.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply interim fix or upgrade to unaffected versions
Vendor Advisory: https://www.ibm.com/support/pages/node/6395108
Restart Required: Yes
Instructions:
1. Review IBM advisory at provided URL. 2. Apply recommended interim fix for affected versions. 3. Restart application services. 4. Consider upgrading to unaffected versions if available.
🔧 Temporary Workarounds
Implement CSRF Tokens
allAdd CSRF tokens to all state-changing requests and validate them server-side
Application-specific implementation required
SameSite Cookie Attribute
allSet SameSite=Strict or SameSite=Lax attributes on session cookies
Set-Cookie: session=value; SameSite=Strict; Secure; HttpOnly
🧯 If You Can't Patch
- Implement web application firewall rules to detect and block CSRF patterns
- Educate users about phishing risks and implement additional authentication for sensitive actions
🔍 How to Verify
Check if Vulnerable:
Check if application version is 7.0.9 or 7.0.11 and lacks CSRF protectionsCheck Version:
Check application version in administration console or configuration filesVerify Fix Applied:
Test that CSRF tokens are required for state-changing requests and validated properly📡 Detection & Monitoring
Log Indicators:
- Multiple state-changing requests from same user without CSRF tokens
- Requests with mismatched referer headers
Network Indicators:
- HTTP POST/PUT requests without CSRF tokens
- Requests with suspicious referer domains
SIEM Query:
source="web_logs" AND (method="POST" OR method="PUT") AND NOT csrf_token=*