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Exploiting null-dereferences in the Linux kernel

Posted by Seth Jenkins, Project Zero For a fair amount of time, null-deref bugs were a highly exploitable kernel bug class. Back when the kernel was able to access userland memory without restriction, and userland programs were still able to map the zero page, there were many easy techniques for exploiting null-deref bugs. However with the introduction...

DER Entitlements: The (Brief) Return of the Psychic Paper

Posted by Ivan Fratric, Project Zero Note: The vulnerability discussed here, CVE-2022-42855, was fixed in iOS 15.7.2 and macOS Monterey 12.6.2. While the vulnerability did not appear to be exploitable on iOS 16 and macOS Ventura, iOS 16.2 and macOS Ventura 13.1 nevertheless shipped hardening changes related to it. Last year, I spent a lot of time...

Exploiting CVE-2022-42703 - Bringing back the stack attack

Seth Jenkins, Project ZeroThis blog post details an exploit for CVE-2022-42703 (P0 issue 2351 - Fixed 5 September 2022), a bug Jann Horn found in the Linux kernel's memory management (MM) subsystem that leads to a use-after-free on struct anon_vma. As the bug is very complex (I certainly struggle to understand it!), a future blog post will describe...

Mind the Gap

By Ian Beer, Project Zero Note: The vulnerabilities discussed in this blog post (CVE-2022-33917) are fixed by the upstream vendor, but at the time of publication, these fixes have not yet made it downstream to affected Android devices (including Pixel, Samsung, Xiaomi, Oppo and others). Devices with a Mali GPU are currently vulnerable. Introduction...

A Very Powerful Clipboard: Analysis of a Samsung in-the-wild exploit chain

Maddie Stone, Project ZeroNote: The three vulnerabilities discussed in this blog were all fixed in Samsung’s March 2021 release. They were fixed as CVE-2021-25337, CVE-2021-25369, CVE-2021-25370. To ensure your Samsung device is up-to-date under settings you can check that your device is running SMR Mar-2021 or later.As defenders, in-the-wild exploit...

Gregor Samsa: Exploiting Java's XML Signature Verification

By Felix Wilhelm, Project ZeroEarlier this year, I discovered a surprising attack surface hidden deep inside Java’s standard library: A custom JIT compiler processing untrusted XSLT programs, exposed to remote attackers during XML signature verification. This post discusses CVE-2022-34169, an integer truncation bug in this JIT compiler resulting in...

RC4 Is Still Considered Harmful

By James Forshaw, Project ZeroI've been spending a lot of time researching Windows authentication implementations, specifically Kerberos. In June 2022 I found an interesting issue number 2310 with the handling of RC4 encryption that allowed you to authenticate as another user if you could either interpose on the Kerberos network traffic to and from...

The quantum state of Linux kernel garbage collection CVE-2021-0920 (Part I)

A deep dive into an in-the-wild Android exploit Guest Post by Xingyu Jin, Android Security ResearchThis is part one of a two-part guest blog post, where first we'll look at the root cause of the CVE-2021-0920 vulnerability. In the second post, we'll dive into the in-the-wild 0-day exploitation of the vulnerability and post-compromise modules.Overview...

2022 0-day In-the-Wild Exploitation…so far

Posted by Maddie Stone, Google Project Zero This blog post is an overview of a talk, “ 0-day In-the-Wild Exploitation in 2022…so far”, that I gave at the FIRST conference in June 2022. The slides are available here. For the last three years, we’ve published annual year-in-review reports of 0-days found exploited in the wild. The most recent of these...

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