Download e-book for kindle: A Guide to Kernel Exploitation: Attacking the Core by Enrico Perla B.Sc. Computer Science University of Torino

By Enrico Perla B.Sc. Computer Science University of Torino M.Sc. Computer Science Trinity College Dublin, Massimiliano Oldani

ISBN-10: 1597494860

ISBN-13: 9781597494861

A advisor to Kernel Exploitation: Attacking the middle discusses the theoretical suggestions and methods had to increase trustworthy and potent kernel-level exploits, and applies them to assorted working structures, specifically, UNIX derivatives, Mac OS X, and home windows. suggestions and strategies are provided categorically in order that even if a particularly unique vulnerability has been patched, the foundational info supplied can help hackers in writing a more recent, greater assault; or support pen testers, auditors, and so on enhance a extra concrete layout and protective constitution.
The ebook is equipped into 4 elements. half I introduces the kernel and units out the theoretical foundation on which to construct the remainder of the booklet. half II specializes in varied working structures and describes exploits for them that focus on a variety of malicious program sessions. half III on distant kernel exploitation analyzes the results of the distant state of affairs and provides new concepts to focus on distant matters. It contains a step by step research of the improvement of a competent, one-shot, distant make the most for a true vulnerabilitya trojan horse affecting the SCTP subsystem present in the Linux kernel. eventually, half IV wraps up the research on kernel exploitation and appears at what the longer term may perhaps hold.

  • Covers more than a few working process households ― UNIX derivatives, Mac OS X, Windows
  • Details universal eventualities equivalent to known 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 selected specialize in the stairs that result in the construction of winning ideas, so that it will provide to the reader anything greater than only a set of tricks

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Extra info for A Guide to Kernel Exploitation: Attacking the Core

Sample text

An Exploit Writer’s View of the Kernel We just briefly explained what “having a backing process” implies: that a lot of process-specific information is available and ready to be used by the kernel path without having to explicitly load or look for it. This means a variable that holds this information relative to the current process is kept inside the kernel and is changed anytime a process is scheduled on the CPU. A large number of kernel functions consume this variable, thereby acting based on the information associated to the backing process.

Userptr, src + buf->offset, sd->len); [3] buf->ops->unmap(pipe, buf, src); […] } The first part of the snippet comes from the vmsplice_to_user() function and gets the destination pointer at [1] using get_user(). That destination pointer is never validated and is passed, through [2], to __splice_from_pipe(), along with pipe_to_user() as the helper function. This function also does not perform any checks and ends up calling __copy_to_user_inatomic() at [3]. We will discuss in the rest of the book the various ways to copy, from inside kernel land, to and from user space; for now, it’s enough to know that Linux functions starting with a “__” (such as __copy_to_user_inatomic()) don’t perform any checks on the supplied destination (or source) user pointer.

You can execute a specific system call), you clearly control the lower portion of the address space. Now assume that you found a kernel vulnerability that allows you to redirect the execution flow wherever you want. Wouldn’t it be nice to just redirect it to some address you know and control in user land? That is exactly what systems implementing a kernel space on behalf of user space allow you to do. Because the kernel page table entries are replicated over the process page tables, a single virtual address space composed of the kernel portion plus your process user-land mappings is active and you are free to dereference a pointer inside it.

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A Guide to Kernel Exploitation: Attacking the Core by Enrico Perla B.Sc. Computer Science University of Torino M.Sc. Computer Science Trinity College Dublin, Massimiliano Oldani


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