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Windows Type-Confusion / Memory Corruption

Windows Type-Confusion / Memory Corruption
Posted Sep 14, 2015
Authored by Google Security Research, matttait

The Windows Kernel is subject to two related kernel-mode type-confusion vulnerabilities inside win32k!xxxRemoteReconnect. In both cases, a user-mode parameter passed to the syscall is incorrectly resolved to its underlying kernel representation via ObReferenceObjectByHandle passing NULL as the "ObType" field (rather than *IoFileTypeObject and *IoDeviceTypeObject respectively). Because the type is not checked, if a handle of a type other than a HANDLE to a file and a device are passed, the kernel incorrectly uses the underlying representation of the object as a PFILE_OBJECT and a PDEVICE_OBJECT, causing memory corruption in the kernel.

tags | advisory, kernel, vulnerability
systems | linux, windows
SHA-256 | 1fc87129199a0c6cd9e6a9fa146cc6e891c7331266896538d14fc884c57013ba
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