ITKarma pictureDon't you think that there has been less research on vulnerabilities in home routers? It does not seem to us, and recently poorly protected devices that transmit data via electrical wires have been added to routers. Such adapters, in addition to the connection method, are no different from ordinary routers and also contain full-fledged control software, not without flaws. The following were found on the Tenda PA6 device ( news , original publishing ) are three vulnerabilities, two of which allow complete control over this “Wi-Fi extender”.

Two of the three vulnerabilities belong to the same class: the device’s web interface does not check the data entered by the user, which makes it possible for an attacker to run arbitrary code with the highest privileges. In one case, a function is used to rename one of the powerline devices on the network. In another, the function of adding a Wi-Fi device to the list of trusted ones. There is only one problem on the path of a potential cracker - two methods of executing commands with root rights do not work without authorization. But, as usual, this was not a serious obstacle due to the standard password for accessing the web interface: admin.

The third vulnerability does not require authorization at all, but it does not provide control over the device. To communicate with network adapters (which, according to the logic of Homeplug connections, there must be two or more), port 48912 is used, when connected to which you can change the name of the internal network for exchanging data through electrical wires. After changing the network name, the key for data encryption also changes - this was done, among other things, to eliminate conflicts between two different Homeplug networks, and, apparently, this interface is used during initial setup. Result: if desired, you can organize a cyclic reboot of the adapters and their complete inoperability.

As usual, when analyzing the firmware, the “tails” of the debugging mode were found: through the web interface, you can get a complete dump of the firmware, and the login and password for accessing the device through the “emergency” UART connection are sewn into the code. What is even sadder, the manufacturer did not respond to the requests of researchers from the IBM laboratory. The combination of the default password and two detected vulnerabilities allows you to attack the device remotely, just lure its owner to the prepared web page.

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