SSA-097435

Siemens Security Advisory by Siemens ProductCERT

SSA-097435: Usernames Disclosure Vulnerability in Mendix Runtime

Publication Date:	2024-09-10
Last Update:	2024-12-12
Current Version:	V1.7
CVSS v3.1 Base Score:	5.3
CVSS v4.0 Base Score:	6.9

SUMMARY

Mendix Runtime contains an observable response discrepancy vulnerability when validating usernames during authentication. This could allow unauthenticated remote attackers to distinguish between valid and invalid usernames.

Siemens has released new versions for the affected products and recommends to update to the latest versions. Note that some, Mendix Runtime version lines (main branch or LTS or MTS versions) provide a complete fix, while others still require additional actions after updating to the latest available version.

AFFECTED PRODUCTS AND SOLUTION

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Affected Product and Versions	Remediation
Mendix Runtime V8 All versions < V8.18.33 only if the basic authentication mechanism is used by the application affected by CVE-2023-49069	Update to V8.18.33 or later version https://docs.mendix.com/releasenotes/studio-pro/8/ See further recommendations from section Workarounds and Mitigations
Mendix Runtime V9 All versions < V9.24.31 only if the basic authentication mechanism is used by the application affected by CVE-2023-49069	Update to V9.24.31 or later version https://docs.mendix.com/releasenotes/studio-pro/9/ See further recommendations from section Workarounds and Mitigations
Mendix Runtime V10 All versions < V10.17.0 only if the basic authentication mechanism is used by the application affected by CVE-2023-49069	Update to V10.17.0 or later version https://docs.mendix.com/releasenotes/studio-pro/10/ See further recommendations from section Workarounds and Mitigations
Mendix Runtime V10.6 All versions < V10.6.16 only if the basic authentication mechanism is used by the application affected by CVE-2023-49069	Update to V10.6.16 or later version. Note that after installing the fix version, the issue still occurs and is only fully resolved after a first successful login. A successful login is also required after every app restart. https://docs.mendix.com/releasenotes/studio-pro/10/ See further recommendations from section Workarounds and Mitigations
Mendix Runtime V10.12 All versions < V10.12.7 only if the basic authentication mechanism is used by the application affected by CVE-2023-49069	Update to V10.12.7 or later version. Note that after installing the fix version, the issue still occurs and is only fully resolved after a first successful login. A successful login is also required after every app restart. https://docs.mendix.com/releasenotes/studio-pro/10/ See further recommendations from section Workarounds and Mitigations

WORKAROUNDS AND MITIGATIONS

Siemens has identified the following specific workarounds and mitigations that customers can apply to reduce the risk:

CVE-2023-49069: Do not use basic authentication, but setup an alternative authentication module (e.g. OIDC SSO, Mendix SSO), or your own Identity Provider (IDP).

Product-specific remediations or mitigations can be found in the section Affected Products and Solution.
Please follow the General Security Recommendations.

GENERAL SECURITY RECOMMENDATIONS

As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.

Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity

PRODUCT DESCRIPTION

Mendix is a high productivity app platform that enables you to build and continuously improve mobile and web applications at scale. The Mendix Platform is designed to accelerate enterprise app delivery across your entire application development lifecycle, from ideation to deployment and operations.

VULNERABILITY DESCRIPTION

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

Vulnerability CVE-2023-49069

The authentication mechanism of affected applications contains an observable response discrepancy vulnerability when validating usernames. This could allow unauthenticated remote attackers to distinguish between valid and invalid usernames.

CVSS v3.1 Base Score	5.3
CVSS v3.1 Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CVSS v4.0 Base Score	6.9
CVSS v4.0 Vector	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE	CWE-204: Observable Response Discrepancy

ACKNOWLEDGMENTS

Siemens thanks the following party for its efforts:

Raquel Gálvez and Julián Menéndez from Hispasec Sistemas for reporting the vulnerability

ADDITIONAL INFORMATION

For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories

HISTORY DATA

V1.0 (2024-09-10):	Publication Date
V1.1 (2024-09-12):	Added fix for Mendix Runtime V8; updated Acknowledgements
V1.2 (2024-10-08):	Fixed a bug in the csaf output
V1.3 (2024-10-10):	Corrected fix version information for all Mendix Runtime version lines (fix releases not yet available, except for V8)
V1.4 (2024-11-12):	Added fix releases for remaining Mendix Runtime version lines
V1.5 (2024-11-26):	Added information about additional required actions after having installed a fix release
V1.6 (2024-12-10):	Added complete fix for Mendix Runtime V10 and the note that other versions still require additional actions after updating to the latest available version
V1.7 (2024-12-12):	Added complete fix for Mendix Runtime V9 and V8

The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.