Heap-based buffer overflow in RealNetworks RealPlayer 11.0 through 11.1, Mac RealPlayer 11.0 through 11.1, Linux RealPlayer 11.0.2.1744, and possibly HelixPlayer 1.0.6 and other versions, allows remote attackers to execute arbitrary code via malformed multi-rate data in an audio stream.
http://www.zerodayinitiative.com/advisories/ZDI-10-266
http://www.securitytracker.com/id?1024861
http://www.redhat.com/support/errata/RHSA-2010-0981.html
http://service.real.com/realplayer/security/12102010_player/en/