Download e-book for kindle: A Guide to Kernel Exploitation: Attacking the Core by Enrico Perla, Massimiliano Oldani

By Enrico Perla, Massimiliano Oldani

ISBN-10: 1597494860

ISBN-13: 9781597494861

The variety of defense countermeasures opposed to user-land exploitation is at the upward push. due to this, kernel exploitation is turning into even more well known between take advantage of writers and attackers. twiddling with the guts of the working method could be a harmful online game: This ebook covers the theoretical concepts and techniques had to enhance trustworthy and potent kernel-level exploits and applies them to diversified 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 make the most needs to be molded to totally make the most its aim. This ebook discusses the most well-liked OS families-UNIX derivatives, Mac OS X, and Windows-and the way to achieve whole keep an eye on over them. suggestions and strategies are awarded categorically in order that even if a in particular precise take advantage of has been patched, the foundational info that you've learn may also help you to jot down a more moderen, higher assault or a extra concrete layout and shielding structure.

* Covers a number of working approach households - UNIX derivatives, Mac OS X, Windows
* information universal situations akin to universal reminiscence corruption (stack overflow, heap overflow, etc.) concerns, logical insects and race conditions
* supplies the reader from user-land exploitation to the area of kernel-land (OS) exploits/attacks, with a specific specialise in the stairs that bring about the construction of profitable recommendations, as a way to supply to the reader whatever greater than only a set of tricks

 

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New PDF release: Apprentice Alf DRM Removal Tools and Calibre Plugin 6.0.9,

Liberate observe: in the event you have already got instruments 6. zero. eight or 6. zero. 7-1 you don't want THIS replace except YOU'RE utilizing CALIBRE 2. in line with Apprentice Alf himself:

The most up-to-date model (v6. zero. nine) doesn't include any new positive aspects or trojan horse fixes and provides aid for the impending model of Calibre. there isn't any have to improve the instruments from the former model (v6. zero. eight) when you are no longer upgrading to the newest model of Calibre.

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If you're doing Kindle retail uploads or have to release Kindle leases, you can use this in preference to the normal Apprentice Alf standalone instruments and/or Calibre plugin. (But in case you don't have an Amazon account otherwise you don't do retail uploads or have to liberate Kindle leases, then you definately don't desire it and will use the traditional toolkit. )

Why? as the inventory instruments don't eliminate watermarks from decoded MOBI and AZW3 documents, this means that there's settling on info (the "atv:kin1:" watermark header) on your retail uploads that hyperlink again for your Amazon account. even though to this point no one has been banned or sued after being pointed out during this means (that we all know of), the data is on your uploads until you eliminate it. (Also, the inventory instruments don't aid removal DRM from Kindle leases or particular types of loans. )

This torrent is largely just like the off-the-shelf Apprentices toolkit, other than that every replica of "mobidedrm. py" within the home windows app, Macintosh app, and Calibre plugins were patched to do the watermark removing and to free up leases. And, seeing that those are source-only adjustments, you could simply ensure the code alterations for your self by way of evaluating the contents of this torrent with the normal instruments from Apprentice Alf. (Note that one of many patched documents is contained in the Calibre plugin zipfile. )

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In the longer term, i'll often be liberating new models inside of a couple of month of the newest replace to the traditional toolkit, even supposing it'll most likely be faster than that, more often than not. A hyperlink to the latest torrent will regularly be came upon on the most sensible of the discussion board thread above.

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

Sample text

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. This kind of vulnerability is usually not exploitable per se, but it does lead to other vulnerabilities in most cases, memory overflows. A lot of integer issues have been detected in basically all the modern kernels, and that makes them a pretty interesting (and, indeed, rewarding) bug class.

If (address + 32 < regs >esp) goto bad area; } if (expand stack(vma, address)) goto bad area; [4] At first, you might think this code looks a bit cryptic, especially because it requires some knowledge of Linux virtual memory internals, but don’t worry: in Chapter 4 we will go into all the gory details. For now, consider vma [1] as a representation, from a kernel perspective, of a range of consecutive virtual memory addresses owned by a user-land process and delimited by vm start and vm end. VM GROWSDOWN [3] is a flag that can be assigned to a virtual memory range to specify that it is or behaves like a stack, which means it grows downward, from higher addresses to lower ones.

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. As an example, 29 30 CHAPTER 2 A Taxonomy of Kernel Vulnerabilities take a look at the following code (taken from a vulnerable path that affected the OpenSolaris kernel;6 the code is condensed here to improve readability): static int64 t kaioc(long a0, long a1, long a2, long a3, long a4, long a5) { […] switch ((int)a0 & ~AIO POLL BIT) { […] case AIOSUSPEND: error = aiosuspend((void *)a1, (int)a2, (timespec t *)a3, (int)a4, &rval, AIO 64); break; […] [1] /*ARGSUSED*/ static int aiosuspend(void *aiocb, int nent, struct timespec *timout, int flag, long *rval, int run mode) { […] size t ssize; […] aiop = curproc >p aio; if (aiop == NULL || nent <= 0) [2] return (EINVAL); if (model == DATAMODEL NATIVE) ssize = (sizeof (aiocb t *) * nent); else ssize = (sizeof (caddr32 t) * nent); […] cbplist = kmem alloc(ssize, KM NOSLEEP) if (cbplist == NULL) return (ENOMEM); if (copyin(aiocb, cbplist, ssize)) { error = EFAULT; goto done; } […] if (aiop >aio doneq) { if (model == DATAMODEL NATIVE) ucbp = (aiocb t **)cbplist; else ucbp32 = (caddr32 t *)cbplist; […] for (i = 0; i < nent; i++) { if (model == DATAMODEL NATIVE) { if ((cbp = *ucbp++) == NULL) [3] [4] [5] Integer Issues In the preceding code, kaioc() is a system call of the OpenSolaris kernel that a user can call without any specific privileges to manage asynchronous I/O.

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


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