The specific flaw exists within the management of indexes in the Jet database engine. Crafted data in a database file can trigger a write past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code under the context of the current process.
Microsoft has issued an update to correct this vulnerability. More details can be found at:
05/08/18 - ZDI reported the vulnerability to the vendor and the vendor acknowledged the report
|Lucas Leong (@_wmliang_) of Trend Micro Security Research