Windows kernel: use-after-free in bGetRealizedBrush

[GoogleCodeExporter]

Credit is to "Nils Sommer of bytegeist, working with Google Project Zero".

I confirm a blue screen on Win 7 32-bit with special pool enabled.

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The attached testcase crashes Win 7 with Special Pool on win32k while accessing 
freed memory in bGetRealizedBrush​​.

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This bug is subject to a 90 day disclosure deadline. If 90 days elapse
without a broadly available patch, then the bug report will automatically
become visible to the public.

Original issue reported on code.google.com by cev...@google.com on 22 Jun 2015 at 10:02

Attachments:

• bug458.cpp
• special_pool458.txt

[GoogleCodeExporter]

MSRC Case 30497 TRK:0001803

Original comment by cev...@google.com on 22 Jun 2015 at 11:42

• Added labels: Id-30497

[GoogleCodeExporter]

Original comment by haw...@google.com on 21 Aug 2015 at 6:59

[GoogleCodeExporter]

Original comment by haw...@google.com on 10 Sep 2015 at 4:26

• Changed state: Fixed
• Added labels: CVE-2015-2518

[GoogleCodeExporter]

Fixed in September bulletin MS15-097.

Original comment by haw...@google.com on 21 Sep 2015 at 9:39

• Removed labels: Restrict-View-Commit