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Vital Vulnerability in Google’s Titan M Chip Earns Researchers $75,000

By Ionut Arghire on August 16, 2022

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Safety researchers at Quarkslab have printed detailed info on a important vulnerability they found in Google’s Titan M chip earlier this yr.

Launched in 2018, Titan M is a system-on-a-chip (SoC) designed to ship elevated safety protections to Pixel gadgets, together with guaranteeing safe boot.

Tracked as CVE-2022-20233, the newly detailed vulnerability was addressed as a part of Android’s June 2022 safety patches, when Google described it as a important escalation of privilege bug.

In line with Quarkslab’s researchers – who found the problem and reported it to Google – the safety flaw will be exploited to realize code execution on the Titan M chip.

The vulnerability is an out-of-bounds write subject that exists due to an incorrect bounds test. Exploiting the bug to realize native escalation of privilege doesn’t require consumer interplay.

Quarkslab says that, whereas fuzzing Titan M, they noticed a crash that was occurring when “the firmware was attempting to put in writing 1 byte in an unmapped reminiscence space,” and found that the bug could possibly be triggered a number of instances to realize out-of-bounds writes.

The safety researchers word that the Titan M reminiscence is totally static, however that they needed to immediately connect with the UART console uncovered by Titan M to entry debugging logs and transfer on with constructing an exploit.

Quarkslab’s researchers then created an exploit that allowed them to learn arbitrary reminiscence on the chip, which allowed them to “dump the secrets and techniques saved within the chip (such because the Root of Belief despatched by the Pixel bootloader when the Titan M is up to date)” and even entry the boot ROM.

“One of the vital attention-grabbing penalties of this assault is the flexibility to retrieve any StrongBox protected key, defeating the best degree of safety of the Android Keystore. Equally to what occurs in TrustZone, these keys can solely be used inside Titan M, whereas they’re saved in an encrypted key blob on the system,” Quarkslab explains.

The researchers reported the vulnerability to Google in March. Google launched a patch in June and initially awarded a $10,000 bounty reward for the bug. Nonetheless, after being supplied with an exploit demonstrating code execution and the exfiltration of secrets and techniques, the corporate elevated the payout to $75,000.

Quarkslab’s researchers offered their findings each on the TROOPERS convention in June and at Black Hat USA final week.

Associated: Google Patches Vital Android Vulnerabilities With June 2022 Updates

Associated: Google Providing As much as $1.5 Million for Android 13 Beta Exploits

Associated: Google Paid Out $8.7 Million in Bug Bounty Rewards in 2021

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