cve/2011/CVE-2011-4885.md

### [CVE-2011-4885](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2011-4885)
![](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

PHP before 5.3.9 computes hash values for form parameters without restricting the ability to trigger hash collisions predictably, which allows remote attackers to cause a denial of service (CPU consumption) by sending many crafted parameters.

### POC

#### Reference
- http://www.exploit-db.com/exploits/18305
- http://www.ocert.org/advisories/ocert-2011-003.html
- http://www.oracle.com/technetwork/topics/security/cpujul2012-392727.html
- http://www.redhat.com/support/errata/RHSA-2012-0019.html
- https://github.com/FireFart/HashCollision-DOS-POC/blob/master/HashtablePOC.py

#### Github
No PoCs found on GitHub currently.