
Hundreds of the ex-head of state's supporters had taken to the streets as he made the rare appearance at the request of a judge.
"The motorcade has come under fire and this is tantamount to an assassination attempt," said Mario Joseph, who represents the former president.
"The shots went to the rear door where Mr Aristide could be found. He is unharmed, but one person is injured and recovering in hospital."
Dubai's Emir flies £300,000 of aid to Haiti in his private jet
The former Haitian president appeared as a witness in a money-laundering case, making a rare public outing that brought hundreds of supporters onto the streets.
The questioning of the 63-year-old in the capital Port-au-Prince lasted more than two hours.
Forced to quit power and flee the country in 2004, Aristide has made only very rare public appearances since his return from exile in South Africa in 2011.
His absence was noticeable at the funeral of his former prime minister Rene Preval on March 11.
He also presented himself as a witness in 2013, before the judge investigating the assassination of top journalist Jean Dominique, who was killed in the capital in 2000.
Aristide, a former shantytown priest, has however not responded to the many calls of a judge investigating suspicions of corruption and embezzlement during his presidency.
On Monday morning, he arrived at the prosecution office in Port-au-Prince accompanied by Maryse Narcisse, the candidate of his party who came fourth in November's presidential elections. They were greeted by hundreds of supporters.
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