The blue is meant to be there, the sky is quite blue in those shots, which makes the smoke etc. also quite blue.
The original prints do have a lot of blue in the Hoth scenes, not as much as the BD release, but still quite a lot more than the home releases, which appear to have been ‘auto balanced’ when the telecine was done, removing a lot of colour from the snow scenes, probably working on the assumption that snow should always be white.
An interesting update to a topic of much contention over the years here.