It was over 6 years ago that the wireless keyboard sniffer project known as “Keykeriki” was first demonstrated. The sniffer allowed someone to eavesdrop on what is being typed as each key was pressed on the keyboard. Recently, another vulnerability dubbed “MouseJack” has been discovered in the way some wireless devices, such as the Logitech Unifying Receivers for wireless keyboards process received RF packets, allowing keystroke injection that bypasses encryption. Exploiting this vulnerability involves transmitting RF packets to a vulnerable vendor dongle and requires physical proximity to the target computer. This vulnerability can be remediated by removing the device or updating the firmware on the vendor dongle to only accept encrypted RF keyboard packets.
Searching for affected devices
While USB Device History Auditing has been a long time capability of Nessus®, Tenable has released a local plugin (ID 88905) to detect the presence of affected versions of the Logitech Unifying Receiver. Additional plugins for other affected vendors will be developed by Tenable and this blog entry will be updated. Since the Logitech plugin reports on historical devices, it requires that the scanner reporting mode be set to “Paranoid”.
In this example, we have USB devices with a Vendor ID (VID) 0x046D and Product ID (PID) 0xC52B. I used both http://www.PCIDatabase.com and http://www.linux-usb.org/usb.ids to identify the corresponding VID as Logitech Inc., and the Product is a USB Receiver. The plugin will report if a vulnerable device has been previously utilized by the host and manual validation will need to be performed if the device is still in use.
USB event monitoring
SecurityCenter Continuous View™ and the Log Correlation Engine™ ( LCE®) Windows client can also detect USB device insertions and removals. The logs generated by these events are normalized to the “usb” event type and include the following normalized events:
Windows-LCE_Client_Detected_Attached_Drive: A USB or CD-ROM drive was attached.
Windows-LCE_Client_Detected_Removed_Drive: A USB or CD-ROM drive was removed.
Windows-LCE_Client_Detected_Attached_USB_Device: A USB peripheral was attached.
Windows-LCE_Client_Detected_Removed_USB_Device: A USB peripheral was removed.
The Windows-LCE_Client_Detected_Attached_USB_Device event indicates that the LCE client detected the attachment of a USB device. The event tells us about the device being attached or detached, including the Vendor ID (VID), the Product ID (PID), and the device serial number/Windows unique identifier, allowing users to look up exactly what is being attached to their hosts.
You can use the following query to alert on the presence of the Logitech Unifying Receiver in your environment:
Type = usb; Normalized Event = Windows-LCE_Client_Detected_Attached_USB_Device ; Syslog Text = “046D AND C52B”
To enable USB event monitoring, use one of the two following configuration tags in your LCE Windows Client policy:
<event-log>Volumes</event-log> <!-- Monitors for USB Events --><event-log>all</event-log> <!-- Monitors for all Events including USB -->Note "Volumes" is a special entry for device monitoring and is not really an event log (or you can also use “all”).
References
Flaws in Wireless Mice and Keyboards Let Hackers Type on Your PC