The flaw can allow malicious access to user's PC. The flaw can be used by creating an amended RealMedia file and to use that file to cause a buffer overflow on user's PC. So, it is not possible to "attack" your RealPlayer, but if you open a RealMedia file from suspectible website or download one from the Net, it might contain alterations that allow exposing this security hole.
Luckily, RealNetworks has already issued a patch for the problem. Patch can be downloaded from here:
http://www.service.real.com/help/faq/security/040123_player/EN/
More information:
RealNetworks
TechWorld
Written by: Petteri Pyyny @ 6 Feb 2004 14:31