Hacking: The Art of Exploitation, 2nd Edition

By Jon Erickson

Hacking is the artwork of inventive challenge fixing, even if that suggests discovering an unconventional option to a tough challenge or exploiting holes in sloppy programming. many of us name themselves hackers, yet few have the powerful technical origin had to fairly push the envelope.

Rather than in basic terms displaying how one can run present exploits, writer Jon Erickson explains how arcane hacking suggestions really paintings. To percentage the artwork and technology of hacking in a fashion that's obtainable to every person, Hacking: The artwork of Exploitation, second Edition introduces the basics of C programming from a hacker's perspective.

The integrated LiveCD offers an entire Linux programming and debugging environment-all with no enhancing your present working procedure. Use it to persist with in addition to the book's examples as you fill gaps on your wisdom and discover hacking thoughts by yourself. Get your fingers soiled debugging code, overflowing buffers, hijacking community communications, bypassing protections, exploiting cryptographic weaknesses, and even perhaps inventing new exploits. This publication will educate you ways to:

  • Program pcs utilizing C, meeting language, and shell scripts
  • Corrupt process reminiscence to run arbitrary code utilizing buffer overflows and structure strings
  • check out processor registers and method reminiscence with a debugger to realize a true figuring out of what's happening
  • Outsmart universal security features like nonexecutable stacks and intrusion detection systems
  • achieve entry to a distant server utilizing port-binding or connect-back shellcode, and change a server's logging habit to conceal your presence
  • Redirect community site visitors, hide open ports, and hijack TCP connections
  • Crack encrypted instant site visitors utilizing the FMS assault, and accelerate brute-force assaults utilizing a password chance matrix

Hackers are regularly pushing the limits, investigating the unknown, and evolving their paintings. no matter if you do not already know the way to application, Hacking: The paintings of Exploitation, 2d Edition offers you an entire photograph of programming, laptop structure, community communications, and present hacking concepts. mix this information with the incorporated Linux setting, and all you would like is your individual creativity.

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N"); pointer = str_a; // Set the 1st pointer to the beginning of the array. printf(pointer); pointer2 = pointer + 2; printf(pointer2); strcpy(pointer2, "y you printf(pointer); // Set the second 2 bytes extra in. // Print it. men! \n"); // replica into that spot. // Print back. } because the reviews within the code point out, the 1st pointer is determined before everything of the nature array. whilst the nature array is referenced like this, it really is really a pointer itself. this can be how this buffer used to be handed as a pointer to the printf() and strcpy() features prior. the second one pointer is determined to the 1st pointer’s handle plus , after which a few issues are published (shown within the output below). reader@hacking:~/booksrc $ gcc -o pointer pointer. c reader@hacking:~/booksrc $ . /pointer hi, global! llo, international! howdy you men! reader@hacking:~/booksrc $ Let’s seriously look into this with GDB. this system is recompiled, and a breakpoint is decided at the 10th line of the resource code. this can cease this system after the "Hello, international! \n" string has been copied into the str_a buffer and the pointer variable is decided to the start of it. reader@hacking:~/booksrc $ gcc -g -o pointer pointer. c reader@hacking:~/booksrc $ gdb -q . /pointer utilizing host libthread_db library "/lib/tls/i686/cmov/libthread_db. so. 1". (gdb) record 1 #include 2 #include three four int main() { five char str_a[20]; // A 20-element personality array 6 char *pointer; // A pointer, intended for a personality array forty four 0x200 7 char *pointer2; // And one more one eight nine strcpy(str_a, "Hello, international! \n"); 10 pointer = str_a; // Set the 1st pointer to the beginning of the array. (gdb) eleven printf(pointer); 12 thirteen pointer2 = pointer + 2; // Set the second 2 bytes additional in. 14 printf(pointer2); // Print it. 15 strcpy(pointer2, "y you men! \n"); // reproduction into that spot. sixteen printf(pointer); // Print back. 17 } (gdb) holiday eleven Breakpoint 1 at 0x80483dd: dossier pointer. c, line eleven. (gdb) run beginning software: /home/reader/booksrc/pointer Breakpoint 1, major () at pointer. c:11 eleven printf(pointer); (gdb) x/xw pointer 0xbffff7e0: 0x6c6c6548 (gdb) x/s pointer 0xbffff7e0: "Hello, global! \n" (gdb) whilst the pointer is tested as a string, it’s obvious that the given string is there and is found at reminiscence deal with 0xbffff7e0. do not forget that the string itself isn’t kept within the pointer variable—only the reminiscence tackle 0xbffff7e0 is saved there. with a purpose to see the particular information kept within the pointer variable, you need to use the address-of operator. The address-of operator is a unary operator, which easily capacity it operates on a unmarried argument. This operator is simply an ampersand (&) prepended to a variable identify. while it’s used, the tackle of that variable is again, rather than the variable itself. This operator exists either in GDB and within the c language. (gdb) x/xw &pointer 0xbffff7dc: 0xbffff7e0 (gdb) print &pointer $1 = (char **) 0xbffff7dc (gdb) print pointer $2 = 0xbffff7e0 "Hello, international! \n" (gdb) whilst the address-of operator is used, the pointer variable is proven to be situated on the deal with 0xbffff7dc in reminiscence, and it comprises the deal with 0xbffff7e0.

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