A 51-year-old man was taken to hospital after he was assaulted in Tanner Street on Wednesday evening.
Southwark Police say that the man's injuries are not life-threatening.
Detectives believe that the victim was sitting in his car when three men pulled up behind him. Two of the suspects approached his vehicle demanding money before assaulting him.
Officers from Southwark Police's priority crime unit are investigating the incident.
Anyone with information should contact them on 020 7232 6127 or speak to Crimestoppers anonymously on 0800 555111.