Integer overflow in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.0.1, Mac RealPlayer 11.0 through 11.1, and Linux RealPlayer 11.0.2.1744 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via a malformed MLLT atom in an AAC file.
http://www.zerodayinitiative.com/advisories/ZDI-10-273
http://www.securitytracker.com/id?1024861
http://service.real.com/realplayer/security/12102010_player/en/