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At Pwn2Own Vancouver 2021 I have demonstrated an 0day VM escape exploit for Parallels Desktop hypervisor. The exploit chain that I developed was based on logic issues. In this deep technical presentation I will share the technical details of the exploit, as well as various preliminary and contextual knowledge related to it.
Logic security vulnerabilities (i.e. those that can be exploited without any memory corruptions) are becoming increasingly important in offensive security research right now, as Rust and other memory-safe programming languages are rapidly taking over popular code bases. When evaluating the attack surface of Parallels Desktop, as an expert in both hypervisors and memory corruption bugs, I saw many opportunities for classical buffer overflows, but chose to try and find a logic bug instead. As hypervisors are ultra-complex low level software, exploitable logic bugs in them are extremely rare. I was lucky to find such a “one of a kind” bug.
Despite the bug was quite simple, the exploit turned out to be not so easy. Exploitation of the bug required me to develop a kernel module for the guest OS from which I was escaping, reverse-engineer some internal RPC protocol of the hypervisor, and emulate it in the exploit code. Eventually the exploit was reliable 100% by design, and executed arbitrary code on the host Mac. During the Pwn2Own competitions it came as a surprize that my exploit did not meet any collisions with other competition entries. Because the bug itself was quite easy, I expected that at least one participant would find and utilize it independently in their own Pwn2Own exploit. But it didn’t happen. That made me aware of the fact that a bug that looks easy does not necessarily imply an easy discovery or an easy exploitation process, an estimation which is very important for strategic aspects of offensive security research.

We will look into how we can bypass kASLR, kLFH, and do hands-on exploitation using data-only attack, which effectively bypasses SMEP and other exploit mitigations.

Upon completion of this training, participants will be able to learn:

• Exploit development process in kernel mode
• Mitigation bypasses
• Pool internals & Feng-Shui
• Arbitrary Read/Write primitive

Burp Suite Pro is the leading tool for auditing Web applications at large, but also a complex beast where new features get added every few weeks. Mastering Burp Suite Pro, including its newest features, allows testers to get the most out of the tool, optimizing time spent auditing and testing. Work will be faster (hotkeys!) and much more efficient (more tools, more possibilities!). Attendees will also learn to measure and assess the quality of their attacks, a crucial skill in real-life engagements that can make the difference between a false-negative and a critical finding.

Agarri.fr – Mastering Burp Suite Pro

Full Stack Web Attack is not an entry-level course. It’s designed to push you beyond what you thought was possible and set you on the path to develop your own workflow for offensive zero-day web research.

This course is developed for web penetration testers, bug hunters and developers that want to make a switch to server-side web security research or see how serious adversaries will attack their web based code.

Students are expected to know how to use Burp Suite and have a basic understanding of common web attacks as well as perform basic scripting using common languages such as python, PHP and JavaScript. Each of the vulnerabilities presented have either been mirrored from real zero-day or are n-day bugs that have been discovered by the author with a focus on not just exploitation, but also on the discovery.

So if you want to learn how to exploit web technologies without client interaction for maximum impact, that is, remote code execution then this is the course for you.

Source Incite – Full Stack Web Attack

To achieve maximum stealth and obtain unabated access to the system, rootkits execute in kernel mode. This course focuses on the kernel interfaces (APIs), data structures and mechanisms that are exploited by rootkits to achieve their goals at every stage of their execution. Kernel security enhancements that have been progressively added from Windows 7 to the latest version of Windows are discussed along with some circumvention techniques. This advanced course provides a comprehensive end-to-end view of the modus-operandi of rootkits by taking an in-depth look at behind the scenes working of the Windows kernel and how these mechanisms are exploited by malware through hands-on labs and real-world case studies. Kernel security enhancements that have been progressively added to Windows are discussed along with some circumvention techniques. Attendees will study key techniques used by rootkits to understand the real-world applicability of these concepts for offensive and defensive purposes. This training is beneficial to anyone responsible for developing, detecting, analyzing, and defending against rootkits and other Windows kernel post-exploitation techniques including EPP/EDR software developers, anti-malware engineers, security researchers, red/blue/purple teamers. A special version of this training is also available for malware, rootkit forensics analysts where the focus is not on implementing rootkit functionality but rather on investigating rootkits using tools such as WinDBG and Volatility. This analyst version does not require attendees to have a programming background and contains topics related to rootkit detection and case studies.