Upon the confirmation of the sale, the executor or administrator must execute to the purchaser an assignment of the contract, which vests in the purchaser, his heirs and assigns, all the right, title and interest of the estate, or of the persons entitled to the interest of the decedent in the lands sold at the time of the sale and the purchaser has the same rights and remedies against the vendor of such land as the decedent would have had if he were living.