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 advance trustworthy and potent kernel-level exploits, and applies them to assorted working structures, specifically, UNIX derivatives, Mac OS X, and home windows. thoughts and strategies are awarded categorically in order that even if a in particular exact vulnerability has been patched, the foundational details supplied can assist hackers in writing a more recent, greater assault; or support pen testers, auditors, and so forth advance a extra concrete layout and shielding constitution.
The booklet is prepared 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 makes a speciality of various working structures and describes exploits for them that concentrate on a variety of trojan horse sessions. half III on distant kernel exploitation analyzes the consequences of the distant state of affairs and provides new innovations to focus on distant matters. It features a step by step research of the advance of a competent, one-shot, distant make the most for a true vulnerabilitya computer virus 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 variety of working approach households ― UNIX derivatives, Mac OS X, Windows
- Details universal situations equivalent to everyday 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 specialize in the stairs that bring about the production of profitable options, so as to provide to the reader whatever greater than only a set of tricks
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Additional info for A Guide to Kernel Exploitation: Attacking the Core
This leads to an inconsistent state of the machine and, generally, to a panic condition or a reboot. , the attacker can set the environment it will run in). , the memory allocator). The attacker races with all the other applications in an attempt to “influence” the kernel. All the applications are consumers of the kernel subsystems. Continued... 1 Differences between user-land and kernel-land exploits (Continued) Attempting to… User-land exploits Kernel-land exploits Execute shellcode The shellcode can execute kernel system calls via userland gates that guarantee safety and correctness.
Integers can also be signed, representing both positive and negative numbers, or unsigned, representing only positive numbers. With n representing the size of an integer in bits, logically up to 2n values can be represented. An unsigned integer can store all the values from 0 to 2 n – 1, whereas a signed integer, using the common two’s complement approach, can represent ranges from –(2n – 1) to (2n – 1 – 1). Before we move on to a more detailed description of various integer issues, we want to stress a point.
All the applications are consumers of the kernel subsystems. Continued... 1 Differences between user-land and kernel-land exploits (Continued) Attempting to… User-land exploits Kernel-land exploits Execute shellcode The shellcode can execute kernel system calls via userland gates that guarantee safety and correctness. The shellcode executes at a higher privilege level and has to return to user land correctly, without panicking the system. Bypass anti-exploitation protections This requires increasingly more complicated approaches.