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A Guide to Kernel Exploitation: Attacking the Core by Enrico Perla, Massimiliano Oldani

By Enrico Perla, Massimiliano Oldani

The variety of safeguard countermeasures opposed to user-land exploitation is at the upward push. due to this, kernel exploitation is changing into even more renowned between make the most writers and attackers. fiddling with the guts of the working procedure could be a risky video game: This ebook covers the theoretical innovations and techniques had to increase trustworthy and powerful kernel-level exploits and applies them to diverse working platforms (Linux, Solaris, Mac OS X, and Windows). Kernel exploits require either artwork and technology to accomplish. each OS has its quirks and so each make the most has to be molded to completely take advantage of its aim. This e-book discusses the preferred OS families-UNIX derivatives, Mac OS X, and Windows-and tips on how to achieve whole regulate over them. innovations and strategies are provided categorically in order that even if a particularly unique make the most has been patched, the foundational details that you've got learn can help you to jot down a more recent, greater assault or a extra concrete layout and shielding structure.

* Covers a number of working approach households - UNIX derivatives, Mac OS X, Windows
* info universal eventualities akin to commonplace reminiscence corruption (stack overflow, heap overflow, etc.) matters, logical insects and race conditions
* supplies the reader from user-land exploitation to the area of kernel-land (OS) exploits/attacks, with a selected concentrate on the stairs that bring about the production of profitable innovations, which will supply to the reader whatever greater than only a set of tricks

 

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Additional resources for A Guide to Kernel Exploitation: Attacking the Core

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This vulnerability was exploited in a variety of ways and allowed an immediate root on nearly all the major Linux distributions, almost bypassing all kernel security patches that were in place. This vulnerability is a classic example of the design flaws we mentioned at the beginning of this chapter. It does not (and would not) matter if the daemon is (was) written in C++, Python, or Java instead of plain C. The vulnerability would still be there. In other words, the flaw stays at a higher level; it is incidental to the architecture.

You do not have to face the problem of finding a large, safe place to store the shellcode. You have 3GB of controlled address space. You do not have to worry about no-exec page protection. Since you control the address space, you can map it in memory however you like. 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.

Both of these interprocess communications (IPC) mechanisms netlink sockets and doors are not limited to kernel-to-user (and vice versa) communication; they can also be used for user-to-user communication. Since these user-land daemons interact directly with the kernel, it is important to protect them correctly (in terms of privileges), and at the same time it is important to guarantee that no one can get in between the communication, impersonating one of the two parties. a. = 0) { info(udev monitor >udev, "sender uid=%d, message ignored", cred >uid); return NULL; } } […] udev device = device new(udev monitor >udev); [6] if (udev device == NULL) { return NULL; } Actually, more than one issue was found with the udevd code, but we will focus on the most interesting one: a faulty architectural design.

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