SEC Consult Vulnerability Lab Security Advisory < 20220427-0 > ======================================================================= title: Privilege Escalation product: Miele Benchmark Programming Tool vulnerable version: at least 1.1.49 and 1.2.71 fixed version: 1.2.72 CVE number: CVE-2022-22521 impact: Medium homepage: https://www.miele.com/ found: 2022-01-24 by: J. Kruchem (Office Vienna) W. Schober (Office Vienna) SEC Consult Vulnerability Lab An integrated part of SEC Consult, an Atos company Europe | Asia | North America https://www.sec-consult.com ======================================================================= Vendor description: ------------------- "There are many good reasons for choosing Miele. Since the company's founding in 1899, Miele has remained true to its "Immer Besser" brand promise. This means that we will do all that we can to be "Immer Besser" (forever better) than our competitors and "Immer Besser" (forever better) than we already are. For our customers, this means the peace of mind of knowing that choosing Miele is a good decision – and probably the decision of a lifetime." Source: https://www.mieleusa.com/c/about-us-9.htm Business recommendation: ------------------------ The vendor provides a patched version which should be installed immediately. An in-depth security analysis performed by security professionals is highly advised, as the software may be affected from further security issues. Vulnerability overview/description: ----------------------------------- 1) Privilege Escalation (CVE-2022-22521) The path where the Miele Benchmark Programming Tool is installed is writable for any user on the Windows operation system. This allows replacing the Uninstall binary and thus an attacker gaining local admin privileges if uninstalled. Proof of concept: ----------------- 1) Privilege Escalation (CVE-2022-22521) The Uninstall string can be found in the following registry entry: Computer\HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall\{<UUID of Miele Benchmark Programming>} The UninstallString field has the following value: UninstallString "C:\MIELE_SERVICE\Miele Benchmark Programming Tool\Uninstall Miele Benchmark Programming Tool.exe" /allusers For exploitation, replace the "Uninstall Miele Benchmark Programming Tool.exe" with a malicious binary and uninstall via Software Center or call the admin and let them uninstall the Miele Benchmark Programming Tool. Vulnerable / tested versions: ----------------------------- The following versions have been tested, which were the latest versions available during the time of the test: * 1.1.49 * 1.2.71 Other (lower) software versions may be affected as well. Vendor contact timeline: ------------------------ 2022-03-21: Contacting vendor through psirt@miele.com 2022-03-22: Vendor answered that they will check the provided information 2022-04-07: Vendor confirmed the vulnerability and answered with aim to fix it asap 2022-04-11: Vendor sent their advisory (including CVE) and fixed version 2022-04-27: Coordinated release of advisory. Solution: --------- The vendor provides a patched version v1.2.72 which can be downloaded here: https://www.miele.com/en/com/downloads-6770.htm Workaround: ----------- Adapt permissions of the C:\MIELE_SERVICE directory according to the least privilege principle. Advisory URL: ------------- https://sec-consult.com/vulnerability-lab/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ SEC Consult Vulnerability Lab SEC Consult, an Atos company Europe | Asia | North America About SEC Consult Vulnerability Lab The SEC Consult Vulnerability Lab is an integrated part of SEC Consult, an Atos company. It ensures the continued knowledge gain of SEC Consult in the field of network and application security to stay ahead of the attacker. The SEC Consult Vulnerability Lab supports high-quality penetration testing and the evaluation of new offensive and defensive technologies for our customers. Hence our customers obtain the most current information about vulnerabilities and valid recommendation about the risk profile of new technologies. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Interested to work with the experts of SEC Consult? Send us your application https://sec-consult.com/career/ Interested in improving your cyber security with the experts of SEC Consult? Contact our local offices https://sec-consult.com/contact/ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mail: security-research at sec-consult dot com Web: https://www.sec-consult.com Blog: http://blog.sec-consult.com Twitter: https://twitter.com/sec_consult EOF J. Kruchem / @2022