Full Report
The Mendix Forgot Password module contains an observable response discrepancy issue that could allow an attacker to retrieve sensitive information. Siemens has released updates for the affected products and recommends to update to the latest versions.
Analysis Summary
# Vulnerability: Observable Response Discrepancy in Mendix Forgot Password Module
## CVE Details
- **CVE ID:** CVE-2023-27464
- **CVSS Score:** 5.3 (Medium)
- **CVSS Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- **CWE:** CWE-204 (Observable Response Discrepancy)
## Affected Systems
- **Products:** Mendix Forgot Password module
- **Versions:**
- Mendix 7 compatible versions < V3.7.1
- Mendix 8 compatible versions < V4.1.1
- Mendix 9 compatible versions < V5.1.1
- **Configurations:** Systems utilizing the Forgot Password module to allow user self-registration or password resets.
## Vulnerability Description
The affected versions of the Mendix Forgot Password module fail to provide uniform responses during the password reset process. This "Observable Response Discrepancy" occurs when the application returns different information or behaviors depending on whether a submitted identifier (such as an email address) exists in the database.
## Exploitation
- **Status:** Not exploited (Proof of Concept status is "Exploitation Predictable" per CVSS/E:P metric).
- **Complexity:** Low
- **Attack Vector:** Network (Remote)
## Impact
- **Confidentiality:** Low (Information disclosure regarding the existence of user accounts).
- **Integrity:** None
- **Availability:** None
## Remediation
### Patches
Siemens recommends updating the module to the latest available version via the Mendix Marketplace:
- **Mendix 7 compatible:** Update to V3.7.1 or later
- **Mendix 8 compatible:** Update to V4.1.1 or later
- **Mendix 9 compatible:** Update to V5.1.1 or later
### Workarounds
No specific software workarounds were provided. Siemens recommends following general security guidelines to protect network access and operating the devices within a protected IT environment.
## Detection
- **Indicators of Compromise:** Unusual volumes of requests to the forgot password or registration endpoints from a single IP, suggesting account enumeration or "brute-forcing" of usernames/emails.
- **Detection methods and tools:** Web Application Firewalls (WAF) or Log Analysis tools can be configured to monitor for automated scanning patterns targeting the `Forgot Password` module's endpoints.
## References
- **Vendor Advisory:** hxxps://cert-portal[.]siemens[.]com/productcert/html/ssa-699404[.]html
- **Mendix Marketplace:** hxxps://marketplace[.]mendix[.]com/link/component/1296
- **Siemens Industrial Security:** hxxps://www[.]siemens[.]com/industrialsecurity