What KB2524375 does?

Hy this week I recived KB2524375. I didn't understood the info about certificate revocation to much. Can someone explain what realy this update does & if it's really need it for future updates.

I believe that this is in reponse to Comodo issuing several secuity certificates for several huge company names to a hacker by mistake.

So those certificat numbers are added to a blacklist (revocation list) so that if you run into a website trying to use one your broswer should block it with a popup asking you if you really want to go there. (It would almost assurably be a bad idea).

So yes. DEFINATELY update it :)

Searched for the KB on microsoft.com and found this as the first hit:
Microsoft Security Advisory: Fraudulent Digital Certificates could allow spoofing
Several more hits if you want to research it further.