[W01-0408] Realtek HD Audio Codec Drivers (Vista) - Local Privilege Escalation

[ Wintercore Advisory ]

Realtek HD Audio Codec Drivers (Vista) - Local Privilege Escalation

:: Non-Technical Description

Realtek HD Audio Codec Drivers are prone to a local privilege escalation
due to insufficient validation of user-mode buffers. Successful
exploitation grants SYSTEM privileges to authenticated users, no special
privileges are required to exploit the flaw.

A malicious attacker can take advantage of these flaws to elevate
privileges in the following forms:

1.  Creating, reading or writing arbitrary registry keys.
   

2.  Overwriting arbitrary kernel addresses.
   

:: Files affected

RTKVHDA.sys < 6.0.1.5605            (32-bit) Windows Vista
RTKVHDA64.sys (signed) < 6.0.1.5605  (64-bit) Windows Vista

:: Credits

Vulnerability discovered and researched by Ruben Santamarta.

:: Disclosure Timeline

04/02/2008 - Realtek contacted
04/23/2008 - Flaw fixed. Public Disclosure.

:: Technical details - Original Advisory

http://www.wintercore.com/advisories/advisory_W010408.html

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