Posted by James Forshaw, Google Project Zero Today, members of Project Zero and the Google Cloud security team are releasing a technical report on a security review of AMD Secure Processor (ASP). The ASP is an isolated core in AMD EPYC CPUs that adds a root of trust and …

A Year in Review of 0-days Used In-the-Wild in 2021 Posted by Maddie Stone, Google Project Zero This is our third annual year in review of 0-days exploited in-the-wild [ 2020, 2019 ]. Each year we’ve looked back at all of the detected and disclosed in-the-wild 0-days as a group …

Posted by Ian Beer, Google Project Zero This blog post is my analysis of a vulnerability exploited in the wild and patched in early 2021. Like the writeup published last week looking at an ASN.1 parser bug, this blog post is based on the notes I took as …

Posted by Ian Beer, Google Project Zero This blog post is my analysis of a vulnerability found by @xerub. Phrack published @xerub's writeup so go check that out first. As well as doing my own vulnerability research I also spend time trying as best as I can to keep …

Posted by Ian Beer & Samuel Groß of Google Project Zero We want to thank Citizen Lab for sharing a sample of the FORCEDENTRY exploit with us, and Apple’s Security Engineering and Architecture (SEAR) group for collaborating with us on the technical analysis. Any editorial opinions reflected below are …

TL;DR: How to make a tiny kernel race window really large even on kernels without CONFIG_PREEMPT : use a cache miss to widen the race window a little bit make a timerfd expire in that window (which will run in an interrupt handler - in other words, in hardirq context …

Posted by Ryan Schoen, Project Zero tl;dr In 2021, vendors took an average of 52 days to fix security vulnerabilities reported from Project Zero. This is a significant acceleration from an average of about 80 days 3 years ago. In addition to the average now being well below …

Posted by Natalie Silvanovich, Project Zero Zoom is a video conferencing platform that has gained popularity throughout the pandemic. Unlike other video conferencing systems that I have investigated, where one user initiates a call that other users must immediately accept or reject, Zoom calls are typically scheduled in advance …

Posted by Ian Beer & Samuel Groß of Google Project Zero We want to thank Citizen Lab for sharing a sample of the FORCEDENTRY exploit with us, and Apple’s Security Engineering and Architecture (SEAR) group for collaborating with us on the technical analysis. The editorial opinions reflected below are …

Posted by Tavis Ormandy, Project Zero Introduction This is an unusual blog post. I normally write posts to highlight some hidden attack surface or interesting complex vulnerability class. This time, I want to talk about a vulnerability that is neither of those things. The striking thing about this vulnerability …

Posted by James Forshaw, Project Zero In my previous blog post I discussed the possibility of relaying Kerberos authentication from a DCOM connection. I was originally going to provide a more in-depth explanation of how that works, but as it's quite involved I thought it was worthy of its …

Posted by James Forshaw, Project Zero This blog post is a summary of some research I've been doing into relaying Kerberos authentication in Windows domain environments. To keep this blog shorter I am going to assume you have a working knowledge of Windows network authentication, and specifically Kerberos and …

An analysis of current and potential kernel security mitigations Posted by Jann Horn, Project Zero Introduction This blog post describes a straightforward Linux kernel locking bug and how I exploited it against Debian Buster's 4.19.0-13-amd64 kernel. Based on that, it explores options for security mitigations that could …

Posted by Ivan Fratric, Project Zero tl;dr I combined Fuzzilli (an open-source JavaScript engine fuzzer), with TinyInst (an open-source dynamic instrumentation library for fuzzing). I also added grammar-based mutation support to Jackalope (my black-box binary fuzzer). So far, these two approaches resulted in finding three security issues in …

Posted by James Forshaw, Project Zero Recently I've been delving into the inner workings of the Windows Firewall. This is interesting to me as it's used to enforce various restrictions such as whether AppContainer sandboxed applications can access the network. Being able to bypass network restrictions in AppContainer sandboxes …

Posted by Felix Wilhelm, Project Zero Introduction KVM (for Kernel-based Virtual Machine) is the de-facto standard hypervisor for Linux-based cloud environments. Outside of Azure, almost all large-scale cloud and hosting providers are running on top of KVM, turning it into one of the fundamental security boundaries in the cloud …

Or how iOS apps on macOS work under the hood Posted by Samuel Groß, Project Zero This short post explains how code compiled for iOS can be run natively on Apple Silicon Macs. With the introduction of Apple Silicon Macs, Apple also made it possible to run iOS apps …

Posted by Ned Williams on, Project Zero Introduction When I started my 20% project – an initiative where employees are allocated twenty-percent of their paid work time to pursue personal projects – with Project Zero, I wanted to see if I could apply the techniques I had learned fuzzing Chrome to …

Posted by Tim Willis, Project Zero At Project Zero, we spend a lot of time discussing and evaluating vulnerability disclosure policies and their consequences for users, vendors, fellow security researchers, and software security norms of the broader industry. We aim to be a vulnerability research team that benefits everyone …

Posted by James Forshaw, Project Zero This is a short blog post about a research project I conducted on Windows Server Containers that resulted in four privilege escalations which Microsoft fixed in March 2021. In the post, I describe what led to this research, my research process, and insights …

Posted by Maddie Stone, Project Zero In October 2020, Google Project Zero discovered seven 0-day exploits being actively used in-the-wild. These exploits were delivered via "watering hole" attacks in a handful of websites pointing to two exploit servers that hosted exploit chains for Android, Windows, and iOS devices. These …

A Year in Review of 0-days Exploited In-The-Wild in 2020 Posted by Maddie Stone, Project Zero 2020 was a year full of 0-day exploits. Many of the Internet’s most popular browsers had their moment in the spotlight. Memory corruption is still the name of the game and how …

A Year in Review of 0-days Exploited In-The-Wild in 2020 Posted by Maddie Stone, Project Zero 2020 was a year full of 0-day exploits. Many of the Internet’s most popular browsers had their moment in the spotlight. Memory corruption is still the name of the game and how …

Posted By Samuel Groß, Project Zero On December 20, Citizenlab published “ The Great iPwn ”, detailing how “Journalists [were] Hacked with Suspected NSO Group iMessage ‘Zero-Click’ Exploit”. Of particular interest is the following note: “We do not believe that [the exploit] works against iOS 14 and above, which includes new …

Posted by James Forshaw, Project Zero This blog is a continuation of my series of Windows exploitation tricks. This one describes an exploitation trick I’ve been trying to develop for years, succeeding (mostly, more on that later) on the latest versions of Windows 10. It’s a trick …