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On 2017-03-14, I reported a bug to Xen's security team that permits an attacker with control over the kernel of a paravirtualized x86-64 Xen guest to break out of the hypervisor and gain full control over the machine's physical memory. The Xen Project publicly released an advisory and a patch for this issue 2017-04-04. To demonstrate the impact of the issue, I created an exploit that, when execute
It’s a well understood fact that platform security is an integral part of the security of complex systems. For mobile devices, this statement rings even truer; modern mobile platforms include multiple processing units, all elaborately communicating with one another. While the code running on the application processor (AP) has been the subject of much research, other components have seldom received
Symantec is a popular vendor in the enterprise security market, their flagship product is Symantec Endpoint Protection. They sell various products using the same core engine in several markets, including a consumer version under the Norton brand. Today we’re publishing details of multiple critical vulnerabilities that we discovered, including many wormable remote code execution flaws. These vulne
On June 1st, I reported an arbitrary recursion bug in the Linux kernel that can be triggered by a local user on Ubuntu if the system was installed with home directory encryption support. If you want to see the crasher, the exploit code and the shorter bug report, go to https://bugs.chromium.org/p/project-zero/issues/detail?id=836. On Linux, userland processes typically have a stack that is around
Posted by James Forshaw, path’ological reverse engineer. How the Win32 APIs process file paths on Windows NT is a tale filled with backwards compatibility hacks, weird behaviour, and beauty†. Incorrect handling of Win32 paths can lead to security vulnerabilities. This blog post is to try and give a definitive* guide on the different types of paths supported by the OS. I’m going to try and avoid di
There’s been a lot of attention recently around a number of vulnerabilities in Android’s libstagefright. There’s been a lot of confusion about the remote exploitability of the issues, especially on modern devices. In this blog post we will demonstrate an exploit for one of the libstagefright vulnerabilities that works on recent Android versions (Android 5.0+ on Nexus 5). The vulnerability (CVE-201
Do we understand the risk vs. benefit trade-offs of security software? Many antivirus products include emulation capabilities that are intended to allow unpackers to run for a few cycles before signatures are applied. ESET NOD32 uses a minifilter or kext to intercept all disk I/O, which is analyzed and then emulated if executable code is detected. Attackers can cause I/O via Web Browsers, Email, I
Posted by Sergei Glazunov and Mark Brand, Google Project Zero Introduction At Project Zero, we constantly seek to expand the scope and effectiveness of our vulnerability research. Though much of our work still relies on traditional methods like manual source code audits and reverse engineering, we're always looking for new approaches. As the code comprehension and general reasoning ability of Larg
Posted by Mark Seaborn, sandbox builder and breaker, with contributions by Thomas Dullien, reverse engineer [This guest post continues Project Zero’s practice of promoting excellence in security research on the Project Zero blog] Overview “Rowhammer” is a problem with some recent DRAM devices in which repeatedly accessing a row of memory can cause bit flips in adjacent rows. We tested a selection
Posted by Chris Evans, Exploit Writer Underling to Tavis Ormandy Back in this 1998 post to the Bugtraq mailing list, Olaf Kirch outlined an attack he called “The poisoned NUL byte”. It was an off-by-one error leading to writing a NUL byte outside the bounds of the current stack frame. On i386 systems, this would clobber the least significant byte (LSB) of the “saved %ebp”, leading eventually to co
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