I'm assuming the track is wood? If it sits above the drawer, is there some sort of mechanical attachment of the drawer to hang from the track, or is there a framework inside the cabinet that the sides of the drawer ride on?

If the drawer sits on a frame and the track is just to keep it moving in a straight line, and if the track is wood and you can get the remnants of the old track completely out

Try gorilla (or other brands) polyurathane (sp?) glue. Sticks like nobody's business to almost anything. Dampen one of the pieces, as the glue is cures in the presence of moisture. Get the track into place and clamp it somehow - best at the glue point. Maybe a small C clamp or spring clamp?

You must clamp the wood in place, as the glue foams slightly during curing and the foaming action will push the gluing surfaces apart. Don't need much pressure - just enough to hold the parts firmly together.

If there's no stress on the track in the vertical plane, this solution should work just fine.

You could also try attaching a corner iron (in the gate hardware section of your local hardware store or big box store) to the track and the corner iron to the cabinet back. That way your screw installation direction is parallel to the drawer travel direction - that is to say you can get a screwdriver on it straight in from the front.

Bosch makes a tiny but powerful Lithium Ion powered screw driver that's shaped like a drill for better control. Reasonably priced (or at least I remembered them being reasonable - checking now they seem pretty pricey for a cabinet repair - Bosch ps10-2, ps20-2 and ps40-2). Of course, you could always use this repair to JUSTIFY the purchase of a new tool.... I've got an entire workshop full of tools, each of which had a very solid justification for its purchase (at least at the time of purchase, the justification was solid - 20-20 vision tends to desolidify logic at a distance).

Hope these ideas prove useful.

Good luck.