Stupid Question: Brake Master Cylinder

My mast cylinder is slowly leaking break fluid out between the firewall and the master cylinder. Is there a gasket in between there that could possible be replaced and solve the problem, or am I looking at replacing the entire master cylinder?

It's an 87 Galant; thanks in advance for your responses.

 

The problem is the seals inside the master cylinder. Nothing you can do but rebuild or replace it.

 

[H05TYL]

the rebuild kit costs about the same as a feed at McDonalds, and the new master cylinder costs about the same as a proper restaurant.

 

HO5TYL.....Nice comparison. Thats pretty dead on. I just got a rebuild kit for mine last week.