What happens to a second mortgage when a home is purchased at a foreclosure auction?

I am going to bid on a house at foreclosure and it has a 1st mortgage of 0K and a second of K. The lender on the first two mortgages is Decision One Mortgage. The lender at foreclosure is Countrywide. Does this mean that if I buy this house at foreclosure that I will own additional money to the second mortgage or just the first mortgage and back taxes?