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Here is the fireball text from Moldvay Basic:
This spell creates a missile of fire that explodes into a ball of fire 40' diamter when it strikes a target. The fire ball will case 1-6 (1d6) points of fire damage per evel of the caster to all creatures within this area. If a victim of a fireball spell saves vs Spells, the spell will only do 1/2 damage.
Here is the fireball text from the 4e PHB:
Standard Action
Area burst 3 within 20 squares
Target: Each creature in burst
Attack: Intelligence vs. Reflex
Hit: 3d6 + Intelligence modifier fire damage.
Miss: Half damage.
That is basically indistinguishable from the Moldvay text, other than format. Neither talks about damage to objects. Both assume that the participants at the table can work out that a great honking ball of fire (40' d in Moldvay Basic, 7sq x 7 sq in 4e) is capable of setting flammable material alight.