Full Report
The basic authentication mechanism of Mendix Runtime contains a race condition vulnerability which could allow unauthenticated remote attackers to circumvent default account lockout measures. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens recommends specific countermeasures for products where fixes are not, or not yet available.
Analysis Summary
# Vulnerability: Race Condition in Mendix Runtime Basic Authentication Leading to Account Lockout Circumvention
## CVE Details
- CVE ID: CVE-2024-50313
- CVSS Score: 5.3 (CVSS v3.1) / 6.9 (CVSS v4.0) ([Low/Medium] depends on scoring version)
- CWE: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
## Affected Systems
- Products: Mendix Runtime V8, Mendix Runtime V9, Mendix Runtime V10.
- Versions:
- Mendix Runtime V8: All versions (only if basic authentication mechanism is used).
- Mendix Runtime V9: All versions.
- Mendix Runtime V10: All versions prior to V10.12.15 or V10.13.7.
- Configurations: Vulnerability is specific to applications utilizing the basic authentication mechanism of Mendix Runtime.
## Vulnerability Description
The basic authentication implementation within Mendix Runtime contains a race condition vulnerability related to shared resources. This flaw allows an unauthenticated remote attacker, by exploiting the timing window of concurrent requests, to circumvent the default account lockout measures implemented by the system.
## Exploitation
- Status: Not explicitly stated as exploited in the wild, but a mechanism exists to bypass security controls.
- Complexity: Low (Based on CVSS Vector: AC:L)
- Attack Vector: Network (Based on CVSS Vector: AV:N)
## Impact
The primary impact is the bypassing of security controls, specifically account lockout measures, which facilitates brute-forcing attempts.
- Confidentiality: No Impact (C:N)
- Integrity: Low Impact (I:L) - Related to unauthorized access attempts.
- Availability: No Impact (A:N)
## Remediation
### Patches
Siemens recommends updating to the following patched versions where available:
- **Mendix Runtime V10:** Update to version **V10.12.15** or **V10.13.7** or later.
### Workarounds
For Mendix Runtime V8 or other scenarios where fixes are not yet available:
1. **Disable Basic Authentication:** Do not use basic authentication. Instead, use alternatives like **OAuth2 (Client Credentials Grant)**, **SAML**, or your **own Identity Provider (IDP)**.
2. **Restrict Authentication Scope (for APIs):** For published REST, web services, and oData APIs, avoid using basic authentication entirely. Use **Custom** or **Active Session** authentication methods instead.
3. **Network Protection:** Apply general security recommendations, primarily by protecting network access to the devices using appropriate mechanisms (e.g., network segmentation, firewalls).
4. **General Security:** Configure the environment according to Siemens' operational guidelines for Industrial Security.
## Detection
- **Indicators of Compromise:** High volume of authentication failures from the same or different IP addresses in a short time window, potentially without subsequent account lockouts.
- **Detection Methods and Tools:** Monitoring authentication logs for unusual patterns indicative of rapid, repeated failed login attempts that should normally trigger rate limiting/lockout mechanisms.
## References
- Siemens Advisory: SSA-914892
- General Guidelines: hxxps://www.siemens.com/cert/operational-guidelines-industrial-security
- Siemens ProductCERT: hxxps://www.siemens.com/cert/advisories
- Terms of Use: hxxps://www.siemens.com/productcert/terms-of-use