
Five-times World Cup winners Brazil are fifth in the Conmebol standings on 18 points, one point behind Colombia and Ecuador, after picking up their second straight draw.
Uruguay are second on 20 points, five behind leaders Argentina.
The top six will automatically qualify for the World Cup in the US, Mexico and Canada.
After a tight first half, Real Madrid midfielder Valverde opened the scoring in the 55th minute when he curled a fine long-range low shot into the far corner.
Gerson brought the hosts level seven minutes later, the Flamengo midfielder scoring his first international goal with a terrific volley after a poor clearance by the Uruguayan defence.