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Google Project Zero asserts that Google should do a better job patching Android devices

Posted on 30 November 202230 November 2022 By RiSec.n0tst3 No Comments on Google Project Zero asserts that Google should do a better job patching Android devices

In order to eliminate zero-day security vulnerabilities, Google’s “Project Zero” team of security specialists frequently criticises negligent businesses on its blog.

Project Zero’s most recent article is a friendly-fire attempt at the Android and Pixel teams, accusing them of being too slow to address issues with the ARM GPU driver.

Project Zero says it reported these issues to ARM “between June and July 2022” and that ARM fixed the issues “promptly” in July and August, issuing a security bulletin (CVE-2022-36449) and publishing fixed source code. But these actively exploited vulnerabilities haven’t been patched for users. The groups dropping the ball are apparently Google and various Android OEMs, as Project Zero says that months after ARM fixed the vulnerabilities, “all of our test devices which used Mali are still vulnerable to these issues. CVE-2022-36449 is not mentioned in any downstream security bulletins.”

An in-the-wild Pixel 6 attack where flaws in the ARM GPU driver could allow a non-privileged user to get write access to read-only memory was described by Project Zero researcher Maddie Stone in June. The following three weeks were devoted to Jann Horn, a different Project Zero researcher, discovering similar flaws in the driver. According to the report, these issues might enable “native code execution in an app context for an attacker to obtain complete access to the system, bypassing Android’s permissions model and providing broad access to user data.”

The affected ARM GPUs include a long list of the past three generations of ARM GPU architectures (Midgard, Bifrost, and Valhall), ranging from currently shipping devices to phones from 2016. ARM’s GPUs aren’t used by Qualcomm chips, but Google’s Tensor SoC uses ARM GPUs in the Pixel 6, 6a, and 7, and Samsung’s Exynos SoC uses ARM GPUs for its midrange phones and older international flagships like the Galaxy S21 (just not the Galaxy S22). Mediatek’s SoCs are all ARM GPU users, too, so we’re talking about millions of vulnerable Android phones from just about every Android OEM.

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In response to the Project Zero blog post, Google told Engadget, “The fix provided by Arm is currently undergoing testing for Android and Pixel devices and will be delivered in the coming weeks. Android OEM partners will be required to take the patch to comply with future SPL requirements.”

The Project Zero analysts end their blog post with some advice for their colleagues, saying, “Just as users are recommended to patch as quickly as they can once a release containing security updates is available, so the same applies to vendors and companies. Minimizing the ‘patch gap’ as a vendor in these scenarios is arguably more important, as end users (or other vendors downstream) are blocking on this action before they can receive the security benefits of the patch. Companies need to remain vigilant, follow upstream sources closely, and do their best to provide complete patches to users as soon as possible.”

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RiSec.n0tst3
Hello! I'm Steve, an independent security researcher, and analyst from Scotland, UK.

I've had an avid interest in Computers, Technology and Security since my early teens. 20 years on, and, it's a whole lot more complicated...

I've assisted Governments, Individuals and Organizations throughout the world. Including; US DOJ, NHS UK, GOV UK.

I'll often reblog infosec-related articles that I find interesting. On the RiSec website, You'll also find a variety of write-ups, tutorials and much more!
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