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Download PDF by Enrico Perla B.Sc. Computer Science University of Torino : 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

ISBN-10: 1597494860

ISBN-13: 9781597494861

A advisor to Kernel Exploitation: Attacking the middle discusses the theoretical recommendations and methods had to improve trustworthy and potent kernel-level exploits, and applies them to various working structures, particularly, UNIX derivatives, Mac OS X, and home windows. thoughts and strategies are awarded categorically in order that even if a in particular unique vulnerability has been patched, the foundational info supplied can help hackers in writing a more moderen, larger assault; or support pen testers, auditors, etc improve a extra concrete layout and shielding constitution.
The booklet 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 diverse working structures and describes exploits for them that focus on numerous computer virus sessions. half III on distant kernel exploitation analyzes the results of the distant state of affairs and provides new recommendations to focus on distant concerns. It contains a step by step research of the improvement of a competent, one-shot, distant make the most for a true vulnerabilitya computer virus 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 could hold.

  • Covers various working approach households ― UNIX derivatives, Mac OS X, Windows
  • Details universal situations akin to typical reminiscence corruption (stack overflow, heap overflow, etc.) concerns, logical insects and race conditions
  • Delivers the reader from user-land exploitation to the realm of kernel-land (OS) exploits/attacks, with a selected specialise in the stairs that bring about the construction of profitable suggestions, with a view to supply 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

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Granted, we crafted that example, and you might think such a thing is unlikely to happen. cr_groups[0] = dp->i_gid; ucp = &ucred; [1] [2] At [1] ucred is declared on the stack. Later, the cr_groups[0] member is assigned the value dp->i_gid. Unfortunately, struct ucred is defined as follows: struct ucred { u_int cr_ref; /* reference count */ […] gid_t *cr_groups; /* groups */ int cr_agroups; /* Available groups */ }; As you can see, cr_groups is a pointer and it has not been initialized (but it is used directly) by the previous snippet of code.

A NOPlike instruction is an instruction that, if executed multiple times before the shellcode, does not affect the shellcode’s behavior. For example, say your shellcode clears a general-purpose register before using it. Any instruction whose only job is to modify this register can be executed as many times as you want before the shellcode without affecting the correct execution of the shellcode itself. If all the instructions are of the same size, as is the case on Reduced Instruction Set Computer (RISC) architectures, any instruction that does not affect the shellcode can be used as a NOP.

Although this penalty may be negligible on some user-land applications, it has a much higher impact if it is applied to the kernel (and, consequently, to the whole system). Performance is a key point for customers, and it is not uncommon for them to choose to sacrifice security if it means they will not incur a decrease in performance. 1 summarizes the key differences between user-land exploits and kernel-land exploits. 1 Differences between user-land and kernel-land exploits Attempting to… User-land exploits Kernel-land exploits Brute-force the vulnerability This leads to multiple crashes of the application that can be restarted (or will be restarted automatically; for example, via inetd in Linux).

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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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