The specific flaw exists within the handling of UMP files. When parsing the WordAddr attribute of the XYSet element, the process does not properly validate the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code under the context of Administrator.
Wecon has issued an update to correct this vulnerability. More details can be found at:
04/05/2018 - ZDI disclosed the report to ICS-CERT
|Mat Powell of Trend Micro Zero Day Initiative