cve/2015/CVE-2015-6835.md

### [CVE-2015-6835](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-6835)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.

### POC

#### Reference
- https://bugs.php.net/bug.php?id=70219
- https://hackerone.com/reports/103998

#### Github
- https://github.com/RobinHoutevelts/Joomla-CVE-2015-8562-PHP-POC
- https://github.com/VoidSec/Joomla_CVE-2015-8562
- https://github.com/leoambrus/CheckersNomisec
- https://github.com/ockeghem/CVE-2015-6835-checker