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CVE-2015-0001

Status Candidate

Overview

The Windows Error Reporting (WER) component in Microsoft Windows 8, Windows 8.1, Windows Server 2012 Gold and R2, and Windows RT Gold and 8.1 allows local users to bypass the Protected Process Light protection mechanism and read the contents of arbitrary process-memory locations by leveraging administrative privileges, aka "Windows Error Reporting Security Feature Bypass Vulnerability."

Related Files

Microsoft Windows 8.1 Ahcache.sys/NtApphelpCacheControl Privilege Escalation
Posted Nov 17, 2015
Authored by Google Security Research, forshaw

On Windows 8.1 Update 32/64 bit, the system call NtApphelpCacheControl (the code is actually in ahcache.sys) allows application compatibility data to be cached for quick reuse when new processes are created. A normal user can query the cache but cannot add new cached entries as the operation is restricted to administrators. This is checked in the function AhcVerifyAdminContext. This function has a vulnerability where it doesn't correctly check the impersonation token of the caller to determine if the user is an administrator. It reads the caller's impersonation token using PsReferenceImpersonationToken and then does a comparison between the user SID in the token to LocalSystem's SID. It doesn't check the impersonation level of the token so it's possible to get an identify token on your thread from a local system process and bypass this check.

tags | exploit, local
systems | linux, windows
advisories | CVE-2015-0001
SHA-256 | 72088e382599651c32cb9cdc5567e22509289abb4b5d97381967f2aafa755155
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