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September 13, 2017

Microsoft, Google patching ‘BlueBorne’ vulnerabilities linked to Bluetooth

by John_A

Why it matters to you

Microsoft and Google are now issuing patches to fix vulnerabilities related to Bluetooth, but you may want to switch it off on other platforms for now.

Bluetooth was originally created in 1998 to serve as a secure short-range wireless connection between two devices. It pairs our wireless mice to our laptops, our smartwatches to our smartphones, and so on. But a recent report published by security firm Armis points to eight Bluetooth-related vulnerabilities — four of which are critical — that reside on more than 5 billion Android, Windows, Linux, and pre-iOS 10 devices. The company dubs this “epidemic” as BlueBorne.

“These vulnerabilities are the most serious Bluetooth vulnerabilities identified to date,” Armis said on Tuesday. “Previously identified flaws found in Bluetooth were primarily at the protocol level. These new vulnerabilities are at the implementation level, bypassing the various authentication mechanisms, and enabling a complete takeover of the target device.”

The problem starts with the complexity of Bluetooth itself. The specification stretches across 2,822 pages, which is massive compared to the base Wi-Fi specification (802.11) consisting of only 450 pages. Because of its complexity, Bluetooth does not receive the same scrutinized audits as other less-complicated protocols. That means vulnerabilities get buried as Bluetooth evolves.

Many issues prior to Bluetooth v2.1 were resolved with the introduction of Secure Simple Pairing, thus the security community shifted its attention away from Bluetooth. But a thorough inspection still needed to be performed and Armis says that its discovery of eight vulnerabilities in a recent analysis of Bluetooth could very well be “the tip of the iceberg.”

Overall, the BlueBorne set of vulnerabilities can enable a hacker to take control of a device, access its content, and use it to infect other Bluetooth-enabled devices with malware. Outside the actual vulnerabilities, the root of the issue stems from keeping Bluetooth turned on. A device will listen for Bluetooth traffic even if it is not set to discoverable mode, so all a hacker needs to know is its Bluetooth device address (BDADDR), and its MAC address.

But how do you get this information? By using open-source hardware sold online that can sniff out encrypted Bluetooth connections passing through the air. These packets of information contain plain text data pointing to the Bluetooth device address. Hackers can then use that address to send unicast traffic if they are within physical proximity of the target device.

“If the device generates no Bluetooth traffic, and is only listening, it is still possible to ‘guess’ the BDADDR, by sniffing its Wi-Fi traffic,” the firm explains. “This is viable since Wi-Fi MAC addresses appear unencrypted over the air, and due to the MACs of internal Bluetooth/Wi-Fi adapters are either the same, or only differ in the last digit.”

Device owners may want to switch Bluetooth off in public until patches are released by original equipment manufacturers and platform developers. This especially holds true in corporate environments where an attacker could gain access to multiple devices, and then hop onto the local network to steal data, and more. BlueBorne should not be an issue within the home environment.

Google and Microsoft released patches on Tuesday, September 12 to address the eight vulnerabilities. Other OEMs and platform developers are working on patches as well.

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