Good-Cooking - Brown Sugar Cinnamon Cake

Ingredients

• 1 (18.25 ounce) box yellow cake mix with pudding
• 1/2 cup vegetable oil
• 4 eggs
• 1 (16 ounce) container sour cream
• 1 cup brown sugar
• 4 teaspoons cinnamon
• 1 cup confectioners' sugar
• 1 teaspoon vanilla extract
• 1 to 3 teaspoons hot water