Two vulnerabilities have been discovered in Microsoft Windows, which can be exploited by malicious, local users to gain escalated privileges and by malicious people to potentially compromise a user's system.

1) An error in win32k.sys when validating input passed from user mode through the kernel component of GDI can be exploited to corrupt memory via e.g. a specially crafted web page containing an IFRAME with an overly large "height" attribute viewed using the Apple Safari browser.

2) A use-after-free error in win32k.sys when handling certain keyboard layouts can be exploited to dereference already freed memory and gain escalated privileges.

Successful exploitation of the vulnerabilities may allow execution of arbitrary code with kernel-mode privileges.

Solution
Apply patches.
Further details available to Secunia VIM customers

Provided and/or discovered by
1) webDEViL
2) The vendor credits Tarjei Mandt, Azimuth Security.

Changelog
Further details available to Secunia VIM customers

Original Advisory
MS12-008 (KB2660465):
http://technet.microsoft.com/en-us/security/bulletin/ms12-008

webDEViL:
https://twitter.com/#!/w3bd3vil/status/148454992989261824

Deep Links
Links available to Secunia VIM customers