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

By Enrico Perla, Massimiliano Oldani

The variety of protection countermeasures opposed to user-land exploitation is at the upward push. due to this, kernel exploitation is changing into even more well known between make the most writers and attackers. twiddling with the center of the working procedure could be a harmful video game: This ebook covers the theoretical thoughts and methods had to boost trustworthy and potent kernel-level exploits and applies them to diverse working structures (Linux, Solaris, Mac OS X, and Windows). Kernel exploits require either artwork and technology to accomplish. each OS has its quirks and so each take advantage of needs to be molded to completely take advantage of its aim. This publication discusses the most well-liked OS families-UNIX derivatives, Mac OS X, and Windows-and how you can achieve whole keep an eye on over them. options and strategies are provided categorically in order that even if a particularly targeted make the most has been patched, the foundational info that you've got learn may also help you to write down a more moderen, larger assault or a extra concrete layout and protective structure.

* Covers a number of working process households - UNIX derivatives, Mac OS X, Windows
* information universal eventualities akin to well-known reminiscence corruption (stack overflow, heap overflow, etc.) matters, logical insects and race conditions
* supplies 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 construction of winning ideas, in an effort to provide 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

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The basic idea behind race conditions is that a correct kernel path can lead to incorrect/exploitable results whenever more than one thread gets to execute it at the same time. In other words, race conditions expose a flaw in the locking/ synchronization design of specific code. The key point in race conditions is the size of the raceable window, which puts a constraint on how easily the race condition can be triggered. For that reason, some race conditions can be exploited only on SMP systems.

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. As shown at [1], [2], and [3] in the preceding code, the udevd daemon can receive sockets of type AF NETLINK and AF UNIX (the local UNIX socket, also used for IPC but only at the user-to-user level).

On the other side of the fence there is the Microsoft Windows family and some commercial UNIX derivates, such as IBM AIX and HP-UX. Having the source code available helps the exploit developer, who can more quickly understand the internals of the subsystem/kernel he or she is targeting and more easily search for exploitation vectors. Auditing an open source system is also generally considered a simpler task than searching for vulnerability on a closed source system: reverse-engineering a closed system is more time-consuming and requires the ability to grasp the overall picture from reading large portions of assembly code.

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