Mason Crosby kicked a 48-yard field goal as time expired in the first half, giving the Packers a 3-0 halftime lead over the Dallas Cowboys at Lambeau Field.
Green Bay has held the Cowboys to just 111 yards of total offense, 31 on the ground, with sacks from linebackers Nick Barnett and Clay Matthews and safety Nick Collins.
Dallas' only scoring threat came on their first possession, but Collins sacked quarterback Tony Romo on 3rd-and-3 to force a 38-yard field goal attempt from Nick Folk that sailed wide left.
With just over four minutes remaining in the half, Romo connected with wide receiver Roy Williams on a deep throw down the middle for a 42-yard gain, but cornerback Charles Woodson stripped the ball and Matthews recovered to give the Packers possession.
The Packers' lone score was helped set up by an 18-yard punt return out to midfield by Tramon Williams, and a 24-yard reception over the middle by wide receiver Donald Driver down to the Cowboys' 27.
Quarterback Aaron Rodgers has completed 16-of-22 passes for 122 yards, and wide receiver Greg Jennings has three catches for 31 yards.
The Packers had the ball for 18:50 compared to 11:10 for Dallas, but Green Bay has been penalized seven times for 60 yards in the first half.