CVE-2022-2237
📋 TL;DR
CVE-2022-2237 is an open redirect vulnerability in Keycloak's Node.js adapter checkSso function. This allows attackers to redirect users to malicious websites after authentication. Organizations using Keycloak Node.js adapter for authentication are affected.
💻 Affected Systems
- Keycloak Node.js Adapter
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers could redirect authenticated users to phishing sites to steal credentials or session tokens, potentially leading to account compromise.
Likely Case
Users are redirected to malicious sites that may attempt credential harvesting or malware distribution.
If Mitigated
With proper input validation and URL filtering, impact is limited to failed redirect attempts.
🎯 Exploit Status
Exploitation requires user interaction (clicking a link) and the user must be authenticated via Keycloak.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Keycloak 18.0.0 and later
Vendor Advisory: https://access.redhat.com/security/cve/cve-2022-2237
Restart Required: Yes
Instructions:
1. Update Keycloak Node.js adapter to version 18.0.0 or later. 2. Update package.json dependencies. 3. Restart Node.js application. 4. Test authentication flows.
🔧 Temporary Workarounds
Input Validation Filter
allImplement server-side validation to reject redirect URLs to external domains
// In your Node.js middleware: if (redirectUrl && !redirectUrl.startsWith('/') && !redirectUrl.startsWith('http://yourdomain.com')) { return res.status(400).send('Invalid redirect'); }
🧯 If You Can't Patch
- Implement WAF rules to block redirects to external domains from authentication endpoints
- Monitor authentication logs for unusual redirect patterns and implement alerting
🔍 How to Verify
Check if Vulnerable:
Check package.json for keycloak-connect version. If version < 18.0.0, you are vulnerable.Check Version:
npm list keycloak-connectVerify Fix Applied:
After updating, test authentication flow with malicious redirect parameter to confirm it's blocked.📡 Detection & Monitoring
Log Indicators:
- Unusual redirect URLs in authentication logs
- Failed authentication attempts with external URLs
Network Indicators:
- HTTP 302 redirects to external domains after /auth endpoints
- Unusual outbound traffic patterns post-authentication
SIEM Query:
source="keycloak.log" AND "redirect" AND NOT (url_domain="yourdomain.com" OR url_domain="localhost")