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 middle discusses the theoretical suggestions and techniques had to strengthen trustworthy and powerful kernel-level exploits, and applies them to diverse working structures, specifically, UNIX derivatives, Mac OS X, and home windows. strategies and strategies are provided categorically in order that even if a particularly distinctive vulnerability has been patched, the foundational info supplied may also help hackers in writing a more recent, larger assault; or support pen testers, auditors, and so on strengthen a extra concrete layout and shielding constitution.
The e-book is equipped into 4 components. half I introduces the kernel and units out the theoretical foundation on which to construct the remainder of the booklet. half II specializes in diversified working structures and describes exploits for them that concentrate on numerous trojan horse periods. half III on distant kernel exploitation analyzes the results of the distant situation and provides new options to focus on distant matters. It encompasses a step by step research of the advance of a competent, one-shot, distant make the most for a true vulnerabilitya trojan horse affecting the SCTP subsystem present in the Linux kernel. ultimately, half IV wraps up the research on kernel exploitation and appears at what the long run could hold.
- Covers a number of working process households ― UNIX derivatives, Mac OS X, Windows
- Details universal eventualities equivalent to favourite reminiscence corruption (stack overflow, heap overflow, etc.) matters, logical insects and race conditions
- Delivers the reader from user-land exploitation to the realm of kernel-land (OS) exploits/attacks, with a specific specialise in the stairs that result in the construction of profitable strategies, with a purpose to supply to the reader anything greater than only a set of tricks
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Extra resources for A Guide to Kernel Exploitation: Attacking the Core
You can map in memory a large portion of the address space and fill it with NOPs or NOP-like code/data, sensibly increasing your chances of success. Sometimes, as you will see, you might be able to overwrite only a portion of the return address, so having a large landing point is the only way to write a reliable exploit. You can easily take advantage of user space dereference (and NULL pointer dereference) bugs, which we will cover in more detail in Chapter 2. All of these approaches are inapplicable in a separated user and kernel space environment.
This is just a starting point for what the software should do, but where should you put this power? Which entity should have such a degree of control and influence over all the other applications? The answer is: the kernel. WHY DOESN’T MY USER-LAND EXPLOIT WORK ANYMORE? ), and they have found that the kernel has been one of the most effective places in which to implement those countermeasures. com) for the Linux kernel, or the security enhancements in, for example, OpenBSD (W^X, Address Space Layout Randomization [ASLR]) or Windows (data execution prevention, ASLR), to get an idea how high the barrier has been raised for user-land exploit developers.
Memory Corruption Vulnerabilities As you can see from this introduction, kernel stack vulnerabilities are not much different from their user-land counterparts and are usually the consequence of writing past the boundaries of a stack allocated buffer. This situation can occur as a result of: • • Using one of the unsafe C functions, such as strcpy() or sprintf(). These functions keep writing to their destination buffer, regardless of its size, until a \0 terminating character is found in the source string.