[ 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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