CVE-2024-50313
📋 TL;DR
A race condition vulnerability in Mendix Runtime's basic authentication implementation allows unauthenticated remote attackers to bypass account lockout protections. This affects Mendix applications using basic authentication across multiple versions of Runtime V8, V9, and V10. Attackers could potentially brute-force credentials without triggering lockout mechanisms.
💻 Affected Systems
- Mendix Runtime
📦 What is this software?
Mendix by Mendix
Mendix by Mendix
Mendix by Mendix
Mendix by Mendix
⚠️ Risk & Real-World Impact
Worst Case
Attackers bypass account lockout to brute-force credentials, gaining unauthorized access to sensitive data or administrative functions.
Likely Case
Credential stuffing or brute-force attacks succeed more easily against vulnerable applications, leading to account compromise.
If Mitigated
With proper monitoring and rate limiting, attacks may be detected before significant damage occurs.
🎯 Exploit Status
Requires race condition exploitation timing; no public exploit code identified yet.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: V9.24.29, V10.6.15, V10.12.7, V10.16.0
Vendor Advisory: https://cert-portal.siemens.com/productcert/html/ssa-914892.html
Restart Required: Yes
Instructions:
1. Identify Mendix Runtime version. 2. Upgrade to patched version: V9.24.29+, V10.6.15+, V10.12.7+, or V10.16.0+. 3. Restart Mendix Runtime service. 4. Verify authentication functionality.
🔧 Temporary Workarounds
Disable Basic Authentication
allSwitch to alternative authentication mechanisms (SAML, OAuth, LDAP) not affected by this vulnerability.
Modify application authentication configuration to use non-basic authentication
Implement External Rate Limiting
allDeploy WAF or reverse proxy with rate limiting for authentication endpoints.
Configure rate limiting rules for /login or authentication endpoints
🧯 If You Can't Patch
- Implement network-level rate limiting and monitoring for authentication attempts
- Enable detailed logging for authentication events and monitor for brute-force patterns
🔍 How to Verify
Check if Vulnerable:
Check Mendix Runtime version and verify if basic authentication is enabled in application configuration.Check Version:
Check Mendix Modeler or Runtime logs for version informationVerify Fix Applied:
Confirm upgraded to patched version and test authentication with multiple rapid failed attempts to verify lockout triggers properly.📡 Detection & Monitoring
Log Indicators:
- Multiple rapid authentication failures from same source without lockout
- Unusual authentication patterns bypassing rate limits
Network Indicators:
- High volume of authentication requests to /login endpoints
- Sustained authentication attempts from single IPs
SIEM Query:
source="mendix-logs" auth_failure count by src_ip | where count > threshold