Detective Senior Sergeant Darrell Harpur said the level of violence used in the attack was concerning and police asked that anyone with information contacted them immediately.
"Just after the attack a person was seen walking out of the victim's driveway onto Aspiring Avenue and we hope that this person can help us with our enquiries," he said.
The person is described as a male Maori or Polynesian of medium build and height, with bushy afro type hair tied back with a white hair tie or band, and with facial hair or a beard. He is possibly aged around the late 20s to mid 30s, police said.
Anyone with information should contact Constable Aron Singh or Detective Senior Sergeant Darrell Harpur at Counties Manukau East Police on 09 250 2800.
To provide information anonymously, phone Crimestoppers on 0800 555 111.