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Microsoft Shares Particulars on Essential ChromeOS Vulnerability

By Ionut Arghire on August 22, 2022

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Microsoft on Friday printed technical particulars on a important ChromeOS vulnerability that could possibly be exploited for denial-of-service (DoS) assaults and – in restricted instances – for distant code execution.

Tracked as CVE-2022-2587 (CVSS rating of 9.8) and described as an out-of-bounds write, the vulnerability was addressed with the discharge of a patch in June.

The difficulty was recognized within the CRAS (ChromiumOS Audio Server) part, and could possibly be triggered utilizing malformed metadata related to songs.

CRAS resides between the working system and ALSA (Superior Linux Sound Structure) to route audio to newly connected peripherals that help audio.

Microsoft’s safety researchers found that the server contained a perform that didn’t verify a user-supplied ‘identification’ argument, thus resulting in a heap-based buffer overflow – a sort of bug typically exploited to realize distant code execution.

The weak part, Microsoft explains, comprises a way that extracts the ‘identification’ from metadata that represents a track’s title. An attacker in a position to modify the audio metadata may subsequently set off the vulnerability.

In accordance with Microsoft, the difficulty could possibly be exploited both from the browser or by way of Bluetooth – in each instances, the weak perform is known as when metadata adjustments, akin to when a brand new track is being performed, both within the browser or by way of a paired Bluetooth machine.

“The impression of heap-based buffer overflow ranges from easy DoS to full-fledged RCE. Though it’s doable to allocate and free chunks by means of media metadata manipulation, performing the exact heap-grooming shouldn’t be trivial on this case and attackers would want to chain the exploit with different vulnerabilities to efficiently execute any arbitrary code,” Microsoft notes.

The flaw was reported to Google in April, simply two months earlier than a patch was launched. Microsoft didn’t discover indicators that the difficulty has been exploited in assaults.

Associated: Essential U-Boot Vulnerability Permits Rooting of Embedded Programs

Associated: Google Broadcasts New Chrome and Chrome OS Safety Options for Enterprises

Associated: Google Patches Fifth Exploited Chrome Zero-Day of 2022

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