An unpatched vulnerability in Windows 8.1 has been disclosed on Google Security Research. The issue was subject to a 90-day automatic disclosure policy, meaning the existence of the vulnerability is published after 90 days without a broadly available patch for the issue. The issue allows for privilege elevation in ahcache.sys/NtApphelpCacheControl.
From the report:
So far this issue has only been found on Windows 8.1, and it is unknown if previous versions of Windows are vulnerable. While no patch is broadly available, at least one user reports that they are unable to replicate the bug in recent builds of Windows 10.
Source: Google Security Research
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