CVE-2024-53843
📋 TL;DR
A reflected XSS vulnerability in @dapperduckling/keycloak-connector-server allows attackers to execute arbitrary JavaScript in victims' browsers by tricking them into clicking malicious URLs. This affects all applications using this authentication library for Node.js/Keycloak integration. Users who click crafted links are at risk of session hijacking, credential theft, or other client-side attacks.
💻 Affected Systems
- @dapperduckling/keycloak-connector-server
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Attackers steal authentication tokens/sessions, compromise user accounts, perform actions as authenticated users, and potentially pivot to internal systems.
Likely Case
Session hijacking, credential theft, phishing via malicious JavaScript, and client-side data exfiltration from users who click malicious links.
If Mitigated
Limited impact with proper WAF rules, input validation, and user awareness about suspicious links.
🎯 Exploit Status
XSS exploitation is well-understood; crafting malicious URLs requires minimal technical skill. No authentication needed - victim just needs to click link.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2.5.5
Vendor Advisory: https://github.com/DapperDuckling/keycloak-connector/security/advisories/GHSA-w5rq-g9r6-vrcg
Restart Required: Yes
Instructions:
1. Update package.json to specify "@dapperduckling/keycloak-connector-server": "^2.5.5". 2. Run npm update or yarn upgrade. 3. Restart your Node.js application. 4. Test authentication flows.
🔧 Temporary Workarounds
WAF Rule Implementation
allDeploy Web Application Firewall rules to block requests containing suspicious URL parameters with JavaScript patterns.
Input Validation Middleware
allAdd server-side validation to sanitize and escape URL parameters before processing in authentication flow.
// Example Express middleware:
app.use((req, res, next) => {
Object.keys(req.query).forEach(key => {
req.query[key] = escapeHtml(req.query[key]);
});
next();
});
🧯 If You Can't Patch
- Implement strict Content Security Policy (CSP) headers to limit script execution
- Deploy reverse proxy with URL parameter sanitization rules
🔍 How to Verify
Check if Vulnerable:
Check package.json for "@dapperduckling/keycloak-connector-server" version <2.5.5. Review if application processes URL parameters without sanitization in auth flows.Check Version:
npm list @dapperduckling/keycloak-connector-serverVerify Fix Applied:
After updating to 2.5.5+, test with crafted URLs containing XSS payloads in URL parameters to ensure they're properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual long URL parameters in authentication requests
- URLs containing script tags or JavaScript patterns in query strings
- Failed authentication attempts with malformed parameters
Network Indicators:
- HTTP requests with suspicious query parameters containing <script>, javascript:, or encoded payloads
- Unusual redirect patterns in authentication flows
SIEM Query:
source="web_logs" AND (url="*<script>*" OR url="*javascript:*" OR url="*%3Cscript%3E*") AND path="*/auth/*"