The silverback gorilla is 7 times stronger than the average adult man, 6 feet tall and 360 lbs pure muscle. It also has knige sharp teeth the size of a butterknife.
The brown bear is around 750 lbs, much stronger than the gorilla with more claws and teeth but much less agile and much slower.
To clarify:
By brown bear i mean a big male grizzly bear. A kodiak bear would almost definetly win but this is just a grizzly.
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If the bear is 3 times the weight of the gorilla, it's pretty much a no contest