The victory gave Boca four points from three matches in second place in Group Four, five points behind leaders Fluminense after the Brazilians beat Venezuela's Zamora 1-0 in Rio de Janeiro.
"We're playing well, we're going to fight for it in the Cup and the (domestic) championship," Boca captain Juan Roman Riquelme told reporters.
"It was a very important victory, what we came looking for. The start got complicated with the goal through bad luck but we were able to turn it round with attitude."
But the visitors equalised just before the half-hour when winger Pablo Mouche latched onto a half clearance in the box and shot under goalkeeper Cristian Campestrini's dive.
Boca needed the win not only to stay in the hunt for a seventh title in South America's elite club competition but also to put behind them a week in which their home defeat by Fluminense was their first in 37 matches.
Mexico's Cruz Azul retained the Group Six lead with a 0-0 draw at home to second-placed Corinthians in Mexico City. After three matches Cruz Azul have seven points and the Brazilians five.
Libertad of Paraguay stayed top of Group Five after a 1-1 draw with Brazil's Vasco da Gama in an ill-tempered match in Asuncion. The same two players who scored the goals, Vasco's Diego Souza and Jose Nunez of Libertad, were sent off.
