CVE-2021-20403
📋 TL;DR
This CSRF vulnerability in IBM Security Verify Information Queue allows attackers to trick authenticated users into performing unauthorized actions on their behalf. Attackers could modify configurations, access sensitive data, or disrupt services. Organizations using IBM Security Verify Information Queue versions 1.0.6 or 1.0.7 are affected.
💻 Affected Systems
- IBM Security Verify Information Queue
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attacker to reconfigure security settings, access all queued data, and potentially pivot to other systems.
Likely Case
Unauthorized configuration changes leading to data exposure or service disruption.
If Mitigated
Limited impact with proper CSRF protections and user awareness training.
🎯 Exploit Status
Exploitation requires tricking authenticated users into visiting malicious pages. No authentication bypass needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Apply interim fix or upgrade as per IBM advisory
Vendor Advisory: https://www.ibm.com/support/pages/node/6414365
Restart Required: Yes
Instructions:
1. Review IBM advisory 2. Apply interim fix or upgrade to patched version 3. Restart application services 4. Verify CSRF protections are enabled
🔧 Temporary Workarounds
Implement CSRF Tokens
allAdd CSRF tokens to all state-changing requests
Application-specific implementation required
SameSite Cookie Attribute
allSet SameSite=Strict or Lax on session cookies
Set-Cookie: session=value; SameSite=Strict; Secure; HttpOnly
🧯 If You Can't Patch
- Implement web application firewall with CSRF protection rules
- Enforce strict referrer policies and CORS settings
🔍 How to Verify
Check if Vulnerable:
Check application version via admin interface or configuration filesCheck Version:
Check application.properties or version.txt files in installation directoryVerify Fix Applied:
Test CSRF protections by attempting to submit requests without valid tokens📡 Detection & Monitoring
Log Indicators:
- Multiple failed state-changing requests from same IP
- Unusual configuration changes
Network Indicators:
- Requests missing CSRF tokens
- Requests with mismatched referrer headers
SIEM Query:
source="ibm-verify-queue" AND (action="config_change" OR action="data_access") AND csrf_token="null"