Multiple heap-based buffer overflows in an ActiveX control in RealNetworks RealPlayer 11.0 through 11.1 and RealPlayer SP 1.0 through 1.1.4 allow remote attackers to execute arbitrary code via a long .smil argument to the (1) tfile, (2) pnmm, or (3) cdda protocol handler.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.