The specific flaw exists within the processing of TrueType fonts. A glyph can be crafted to cause a buffer overflow in win32k!vCopyClearTypeBits in the Windows kernel, allowing read and write access to kernel memory. This can be leveraged by an attacker to run arbitrary code in the context of SYSTEM.
Microsoft has issued an update to correct this vulnerability. More details can be found at:
|KeenTeam's Jihui Lu and Peter Hlavaty