Table of Content
The Google Home Mini is a smart speaker that's built on the same platform as the original Google Home, but it's significantly smaller. If the device has been used before, factory reset your speaker or display before you continue. The Google Home has a single speaker with two passive radiators, which really help it produce decent sound for a device of its size.
Finally, it may be a mandatory step if one's goal is to dump the very low-level bootROM code of the main processor. Apart from attempting to run my own code of the Google Home, I guess this solution could also be used to keep track of all firmware updates performed by Google. Indeed, it's possible to let the device run normally for an extended period of time while dumping the entire flash content from time to time. Use the Home app to control on/off, volume, playback, inputs, and more for your connected streaming and media devices. When available, your speaker or display will automatically update to the latest software version.
The Interposer Board
Below are the specifications for Google Nest and Home speakers and displays . I have sleep sounds for 30 minutes as part of a bedtime routine and it keeps playing all night. The two biggest differences between the Google Home and the Google Home Mini are size and price. The Home Mini is significantly smaller and fades more readily into your home decor, and it also costs a lot less. The Home Mini can also do everything the regular Google Home can do, but the larger device does provide richer sound that does a much better job filling a room. While there are privacy concerns with a device like Google Home Mini that is always listening for a wake word, Google is fairly transparent with what it records.
Optionally, a NAND Flash can be directly soldered to the board. A FT2232H. This component adds Hi-Speed USB connectivity to the board. Hardware files are available here while the software can be downloaded from here. I made the schematics, Gerber files, and software of NandBug publicly available. The general idea is in fact to make the NAND Flash of the Google Home in-system programmable. It may sound like an over engineered solution and it maybe is.
Chromecast Vulnerabilities
I guess this nibbles swapping weirdness is caused by the way the low-level hardware BCH engine is actually working. Swap another time the nibbles of the computed BCH code. Swap the nibbles of each of the 2080 first bytes of the page.
The Google Home app is designed to show you the status of your home and keep you up to date with what you may have missed. Check in on your home anytime and see a recap of recent events. You can also get a notification if something important happens while you’re away. Turn on the lights, adjust the thermostat, or get an alert when there’s a person or package at your front door. Google Home on WearOS will be available as a preview as we continue to add controls and improvements.
Loa thông minh Google Nest Hub 2nd 7inch – Phiên bản mới ra 2021 New Seal
Finally, it's important to note that the main CPU comes without public documentation. Very few details about this component are available online. All the juicy technical data is likely protected by a NDA. The main speaker of the Google Home can be plugged to this two pins connector. Visit the Google Nest Safety Center at safety.google/nest to learn more about how we protect your information and respect your privacy. Control your Google Assistant activity, privacy settings, information, and personal preferences.
So the Nest Mini is essentially just a slightly more expensive, and slightly better, version of the Google Home Mini. For instance, keeping track of the Google Home Mini firmware releases becomes relatively easy. Further, attempting to run arbitrary code on the device from the NAND Flash becomes possible.
This source code will be extremely useful in the second article of this series. In 2014, fail0verflow was able to root Chromecast devices with a vulnerability affecting the bootloader. A buffer overflow vulnerability triggered thanks to a special USB peripheral led to a full secure boot bypass. That said, the Home Mini used a micro-USB port instead of a barrel plug connector, and some people preferred that approach.
Another transformation was applied to the data before or after BCH encoding. However, this information alone isn't enough to compute the ECC in the exact same way with the hardware. Each page is very likely using an ECC placed in the OOB area. Further, for two identical "data" pages, the corresponding OOB area will be the same as well. Given this information, a graphical representation of the binary dumped data can quickly help checking whether the OOB section is likely to be used for storing ECC or not.
Reading through the init.rc script of the initramfs, it appears these two partitions are YAFFS2 partitions. The Linux Kernel version and compilation timestamp can be extracted from strings present in the binary data. Here, the Linux Kernel command line contains the mtdparts configuration variable. This leaks both the names and sizes of all flash partitions.
A few weeks ago we unveiled Google Home Mini, the newest addition to the Google Home family. About the size of a donut, it has all the smarts of the Google Assistant and gives you hands-free help in any room of your house. Starting today, you can grab it online from the Google Store or online or on shelves of Best Buy, Walmart, Target and other stores.
That information is passed to the cloud, where Google's powerful servers get to work. Don't be fooled by the Google Home Mini's affordable price tag or diminutive size. We know the bootloader and kernel partitions are part of the chain of trust. Unsurprisingly, because they are probably the most carefully written parts, I haven't been able to find any way to skip the secure boot from this side. One of the very early design goal of NandBug was to be able to monitor the data read and written by the Google Home to the NAND Flash in real time. It could maybe have been useful to find interesting TOCTOU bugs in the secure boot implementation.
My goal is not only to read but also to alter the NAND Flash data to achieve code execution. Hence, the ECC of all modified pages must be computed. Otherwise, the Google Home Processor will simply discard all the modified pages. It appears that for each page, the OOB section is filled with a 90 bytes chunk of data. Thanks to NandBug, it's now possible to easily dump the entire content of the NAND Flash.
No comments:
Post a Comment