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Google and Intel warn of a serious Linux security bug




Google and Intel warn of severe Bluetooth flaws in all versions except the latest version of the Linux kernel. Google researchers said the bug allowed attackers within the Bluetooth range to execute seamless code, but Intel has characterized the flaw as providing privilege escalation or disclosure of information. I will.

This flaw is in BlueZ, a software stack that implements all Bluetooth core protocols and layers for Linux by default. In addition to Linux laptops, it is used in many consumer and industrial Internet of Things devices. Works with Linux version 2.4.6 and above.

Seeking details

So far, little is known about Bleeding Tooth, the name given by Google engineer Andy Nguyen, who said his blog post will be published soon. Twitter threads and YouTube videos provide the most details, and this bug provides a reliable way to execute malicious code of choice by nearby attackers on vulnerable Linux devices that use BlueZ for Bluetooth. Gives the impression of doing.

BleedingTooth is a set of zero-click vulnerabilities in the Linux Bluetooth subsystem that could allow an unauthenticated remote attacker to execute arbitrary code with kernel privileges on a vulnerable device. Is writing. His discovery is another concept that allows an attacker to send a command of his choice without clicking a link, connecting to a rogue Bluetooth device, or performing any other action. He said he was inspired by the research that led to the proof-of-concept exploit, BlueBorne. Turn on Bluetooth.

BleedingTooth is a set of zero-click vulnerabilities in the Linux Bluetooth subsystem that could allow an unauthenticated remote attacker to execute arbitrary code using kernel privileges on a vulnerable device. ..

— Andy Nguyen (@ theflow0) October 13, 2020

Below is a YouTube video showing how the exploit works.

BleedingTooth: Linux Bluetooth Zero Click Remote Code Execution

Meanwhile, Intel has issued this minimal advisory to classify this flaw as an elevation of privilege or disclosure vulnerability. The advisory assigned CVE-2020-12351, one of the three different bugs that make up BleedingTooth, a severity score of 8.3 out of 10.

A potential security vulnerability in BlueZ could allow for elevated privileges and disclosure, the advisory said. BlueZ has released a Linux kernel fix to address these potential vulnerabilities.

Intel, a major contributor to the BlueZ open source project, said the most effective way to patch the vulnerability is to update to the Linux kernel version 5.9, which was released on Sunday. If you cannot upgrade to version 5.9, you can install a set of kernel patches for Advisory Link. The BlueZ maintainer did not immediately respond to an email asking for additional details regarding this vulnerability.

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