Fairness for Korean DMZ Veterans Act of 2017 This bill provides a presumption of herbicide exposure as the service-connected cause of certain diseases notwithstanding that there is no evidentiary record of any such disease during a veteran's service period. The bill defines a "veteran" for purposes of this bill as an individual who, during active military, naval, or air service, served in or near the Korean demilitarized zone during the period beginning on September 1, 1967, and ending on August 31, 1971. The bill specifies such a disease as: (1) a listed disease that becomes manifest, or (2) any additional disease that the Department of Veterans Affairs determines warrants a presumption of service-connection by reason of a positive association with herbicide exposure and that manifests itself within a prescribed period.