Marco Di Vaio tied the game in the 80th minute after Salt Lake captain Kyle Beckerman gave the visitors the lead with a goal three minutes earlier.
Ferrari took a sliding shot as a low ball came in from the corner and put it behind goalkeeper Nick Rimando for the central defender's first goal of the season.
The Impact (6-2-2) also had a goal from Felipe Martins while Salt Lake (5-3-2), which ended a two-game winning run, got an own goal in the first half.
The visitors used speed to pressure the Montreal defence early and it produced an own goal seven minutes in as Lovel Palmer's pass into the middle was accidentally tipped past Perkins by Ferrari, normally the Impact's most reliable defender.
Olmes Garcia had a glittering chance for a two-goal lead, but Perkins reached a hand to his right to stop a close range attempt in the 15th minute.
Montreal got it back in the 39th as Jeb Brovsky sent Justin Mapp down the right flank and his low cross was put in by Felipe.
Beckerman put Salt Lake ahead in the 77th as he jumped on a loose ball after a corner kick and scored.
Rookie Maxim Tissot started the play that saw Andrew Wenger tip a pass ahead for Di Vaio to put in off the left post.
Salt Lake has never won in 10 MLS games in Canada. It was their first visit to Montreal.
Notes: Academy graduate Maxim Tissot made his first MLS start for Montreal at left back replacing Dennis Iapichino. . . Midfielders Davy Arnaud (concussion) and Andrea Pisanu (right quad strain) forward Daniele Paponi (right hamstring), and defenders Alessandro Nesta (right quad) and Nelson Rivas (left knee) remain sidelined. . . Salt Lake sent defender Nat Borchers home with a flu on Wednesday, which brought Kwame Watson-Siriboe back in the lineup.
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