By Enrico Perla B.Sc. Computer Science University of Torino M.Sc. Computer Science Trinity College Dublin, Massimiliano Oldani
A advisor to Kernel Exploitation: Attacking the center discusses the theoretical ideas and ways had to strengthen trustworthy and potent kernel-level exploits, and applies them to varied working structures, specifically, UNIX derivatives, Mac OS X, and home windows. suggestions and strategies are awarded categorically in order that even if a particularly unique vulnerability has been patched, the foundational details supplied can assist hackers in writing a more moderen, greater assault; or support pen testers, auditors, and so forth improve a extra concrete layout and protective constitution.
The ebook is geared up into 4 components. half I introduces the kernel and units out the theoretical foundation on which to construct the remainder of the e-book. half II specializes in diverse working platforms and describes exploits for them that focus on a number of trojan horse periods. half III on distant kernel exploitation analyzes the results of the distant state of affairs and offers new ideas to focus on distant concerns. It contains a step by step research of the improvement of a competent, one-shot, distant take advantage of for a true vulnerabilitya malicious program affecting the SCTP subsystem present in the Linux kernel. ultimately, half IV wraps up the research on kernel exploitation and appears at what the longer term might hold.
- Covers a number working procedure households ― UNIX derivatives, Mac OS X, Windows
- Details universal eventualities comparable to widespread reminiscence corruption (stack overflow, heap overflow, etc.) matters, logical insects and race conditions
- Delivers the reader from user-land exploitation to the area of kernel-land (OS) exploits/attacks, with a specific specialise in the stairs that bring about the production of winning recommendations, which will provide to the reader anything greater than only a set of tricks
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Additional resources for A Guide to Kernel Exploitation: Attacking the Core
The physical address space range is the set of addresses that goes from 0 to RAM SIZE – 1. At the same time, modern operating systems provide to each running process and to various kernel subsystems the illusion of having a large, private address space all for themselves. This virtual address space is usually larger than the physical address space and is limited by the architecture: on an n-bit architecture it generally ranges from 0 to 2n − 1. The virtual memory subsystem is responsible for keeping this abstraction in place, managing the translation from virtual addresses to physical addresses (and vice versa) and enforcing the separation between different address spaces.
While the pointer is uninitialized, its value is whatever value resides in the memory assigned to hold the pointer variable. People already familiar with writing exploits (or who have an exploit-oriented mindset) might be wondering if it is possible to predict the value of that memory and use it to their advantage. The answer is yes, in many cases it is (or, at least, it is possible to have an idea of the range). For instance, consider a pointer declared as a local variable, as shown in the following code.
We dedicated a whole section to this concept because it highly affects the way we write exploits. In fact, on combined systems we have a lot more weapons on our side. We can basically dereference any address in a process address space that we control. We finished the chapter with a small refresher on the open versus closed source saga just to point out that most of the operating systems we will cover (with the notable exception of the Windows family) provide their source code free for download.
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