Google and Intel warn of Linux security bug that allows malicious...

Google and Intel have discovered a very serious security vulnerability that affects all versions of the Linux kernel from 4.8, except the most recent, version 5.9 released on Monday. Vulnerability resides in BlueZ, the software stack that by default implements all base layers and protocols of Bluetooth wireless technology for Linux. According to a Google researcher, the flaw allows transparent execution of code in the Bluetooth gate and according to Intel, the vulnerability provides escalation of privileges or disclosure of information.

BlueZ is software that implements Bluetooth wireless technology on GNU / Linux operating systems. It was originally created by Max Krasnyansky of the company Qualcomm, but the company made it open source and released under the GNU GPL in 2001. BlueZ subsequently became the benchmark Bluetooth implementation for Linux and was incorporated to the core. It is officially part of the Linux kernel since version 2.4.6. Apart from Linux laptops, BluZ is used in many consumer and industrial internet devices.

Google engineer Andy Nguyen, the originator of the discovery has dubbed the flaw BleedingTooth, but as of yet, there is very little information on it. However, he promised to shed more light on the matter in the coming days. In the meantime, in a tweet and a video on YouTube, he has provided some details on the vulnerability. According to these sources, the bug represents a reliable way for nearby attackers to execute malicious code of their choice on vulnerable Linux devices, especially Linux devices with version 4.8 or higher, except version 5.9.

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Google detailed the vulnerability on the company’s security research repository on GitHub. In the video, Nguyen showed how the attack can occur by using commands on a Dell XPS 15 powered by Ubuntu laptop to open the calculator on a second Dell laptop, still running Ubuntu, without any action being taken. performs on the latter. Likewise, it should be noted that BlueZ contains several Bluetooth modules, including the core of the central Bluetooth subsystem and the L2CAP and SCO audio core layers.

According to Francis Perry of Google’s Product Security Incident Response Team, a Bluetooth-ported attacker with the target’s Bluetooth device address (bd address) can execute an arbitrary code with kernel privileges. A short range attacker who has the victim’s bd address can send a malicious l2cap packet and cause a service denial or possibly the execution of an arbitrary code with kernel privileges. Malicious Bluetooth chips can also trigger the vulnerability, Perry wrote.

Google has released a proof of concept exploit code for the BleedingTooth vulnerability. He also promised to post more information about BleedingTooth on the company’s security blog shortly. For its part, Intel published a bulletin that classifies the flaw as either a privilege escalation vulnerability or a vulnerability allowing data disclosure. The document published by the OEM gives a severity rating of 8.3 out of 10 for CVE-2020-12351, one of the three separate bugs that make up BleedingTooth.

Potential security vulnerabilities in BlueZ can allow escalation of privileges or disclosure of information, Intel wrote. BlueZ is releasing Linux kernel patches to address these potential flaws, he added. The company has a few fixes that you could install if a kernel upgrade is not possible. The flaw exists, but security experts say there’s no reason to panic, because like almost all Bluetooth-related security holes, BleedingTooth requires proximity to a vulnerable device.

It also requires highly specialized knowledge and only works on a tiny fraction of the world’s Bluetooth devices. These limitations significantly reduce the number of people, if any, who are able to successfully carry out an attack.

Sources : Google, Document dIntel

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