The amendment of the official ranking of the men's 69 kg weightlifting competition, and the reallocation of the bronze medal, is of the responsibility of the weightlifting federation and the International Olympic Committee, said CAS.
He is the first medallist at these Games to test positive for a banned substance.
Mongolian weightlifter tests positive for testosterone
Later on Thursday Moldovan canoe sprint bronze medallist Serghei Tarnovschi was provisionally suspended from the Rio Olympics, after he failed a pre-games drug test, the International Canoe Federation said.
Moradi secures golden double for Iran
World record and gold for Iran's Rostami