Judicial confession if it is found to be true and voluntary, can indeed form the sole basis of conviction as against the maker of confession. 

(State Vs. Delwar Hossain & others, 2011, 40 CLC (HCD) [8129])

See, Md. Islam Uddin @ Din Islam Vs. State, 2007, 36 CLC (AD) [2247], Md. Nur Alam and another Vs. State, 2012, 41 CLC (HCD) [8217].