By Enrico Perla B.Sc. Computer Science University of Torino M.Sc. Computer Science Trinity College Dublin, Massimiliano Oldani
A consultant to Kernel Exploitation: Attacking the middle discusses the theoretical concepts and techniques had to boost trustworthy and potent kernel-level exploits, and applies them to various working platforms, specifically, UNIX derivatives, Mac OS X, and home windows. techniques and strategies are provided categorically in order that even if a in particular exact vulnerability has been patched, the foundational details supplied may also help hackers in writing a more recent, larger assault; or aid pen testers, auditors, and so forth advance a extra concrete layout and shielding constitution.
The booklet is equipped into 4 elements. 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 diversified working platforms and describes exploits for them that focus on a number of trojan horse sessions. half III on distant kernel exploitation analyzes the results of the distant situation and provides new recommendations to focus on distant matters. It features a step by step research of the advance of a competent, one-shot, distant take advantage of 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 long run may possibly hold.
- Covers more than a few working method households ― UNIX derivatives, Mac OS X, Windows
- Details universal situations corresponding to ordinary 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 specialise in the stairs that result in the production of profitable recommendations, as a way to supply 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
Temporary buffers). An example of a frequently used object is the structure for holding information about each directory entry on the file system or each socket connection created. Searching for a file on the file system will quickly consume a lot of directory entry objects and a big Web site will likely have thousands of open connections. Whenever such objects receive a specific cache, the size of the chunks will likely reflect the specific object size; as a result, non-power-of-two sizes will be used to optimize space.
Note that an attacker might be able to predict to some extent the source/destination of an uncontrolled 25 26 CHAPTER 2 A Taxonomy of Kernel Vulnerabilities read/write, and therefore successfully and, more importantly, reliably exploit this scenario too. MEMORY CORRUPTION VULNERABILITIES The next major bug class we will analyze covers all cases in which kernel memory is corrupted as a consequence of some misbehaving code that overwrites the kernel’s contents. There are two basic types of kernel memory: the kernel stack, which is associated to each thread/process whenever it runs at the kernel level, and the kernel heap, which is used each time a kernel path needs to allocate some small object or some temporary space.
Arithmetic) Integer Overflows An integer overflow occurs when you attempt to store inside an integer variable a value that is larger than the maximum value the variable can hold. The C standard defines this situation as undefined behavior (meaning that anything might happen). In practice, this usually translates to a wrap of the value if an unsigned integer was used and a change of the sign and value if a signed integer was used. Integer overflows are the consequence of “wild” increments/multiplications, generally due to a lack of validation of the variables involved.