openHAB, a provider of open-source home automation software, has add-ons including the visualization add-on CometVisu. Prior to version 4.2.1, the proxy endpoint of openHAB's CometVisu add-on can be accessed without authentication. This proxy-feature can be exploited as Server-Side Request Forgery (SSRF) to induce GET HTTP requests to internal-only servers, in case openHAB is exposed in a non-private network. Furthermore, this proxy-feature can also be exploited as a Cross-Site Scripting (XSS) vulnerability, as an attacker is able to re-route a request to their server and return a page with malicious JavaScript code. Since the browser receives this data directly from the openHAB CometVisu UI, this JavaScript code will be executed with the origin of the CometVisu UI. This allows an attacker to exploit call endpoints on an openHAB server even if the openHAB server is located in a private network. (e.g. by sending an openHAB admin a link that proxies malicious JavaScript.) This issue may lead up to Remote Code Execution (RCE) when chained with other vulnerabilities. Users should upgrade to version 4.2.1 of the CometVisu add-on of openHAB to receive a patch.
An attacker without any authentication can send requests to the CometVisu proxy endpoint, forcing the server to initiate GET requests to internal network resources not publicly accessible (SSRF). Additionally, the attacker can redirect the proxy request to a server controlled by them and return a page with malicious JavaScript code, which will be executed in the context of the CometVisu interface (XSS). An example attack vector is tricking an openHAB administrator into clicking a crafted link, which through the proxy injects malicious JavaScript executed with CometVisu UI privileges, allowing interaction with openHAB server endpoints even in a private network.
An attacker can gain access to internal network resources (SSRF), execute malicious JavaScript code in the victim's browser (XSS), and in a chaining scenario with other vulnerabilities — lead to full Remote Code Execution on the openHAB server.
The CometVisu addon should be updated to version 4.2.1 or newer, in which access to the proxy endpoint requires authentication. Patch available in the openHAB GitHub repository (commit 630e8525835c698cf58856aa43782d92b18087f2)
openHAB with the CometVisu addon installed in versions prior to 4.2.1, especially when the openHAB server is exposed to a public or semi-public network
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:NOpenhab Web Interface
APPOpenhab< 4.2.1
Related vulnerabilities
openHAB CometVisu: path traversal umożliwiający RCE bez uwierzytelnienia
openHAB before 2.5.2 allow a remote attacker to use REST calls to install the EXEC binding or EXEC transformat...
openHAB, a provider of open-source home automation software, has add-ons including the visualization add-on Co...
openHAB, a provider of open-source home automation software, has add-ons including the visualization add-on Co...
openHAB is a vendor and technology agnostic open source automation software for your home. In openHAB before v...