An insufficient array boundary checking flaw was fixed in Real Player's / HelixPlayer's RuleBook structures handling code, leading to a heap corruption:

http://lists.helixcommunity.org/pipermail/common-cvs/2008-January/015484.html https://helixcommunity.org/viewcvs/common/util/rlstate.cpp?view=log#rev1.10

A possible buffer overflow flaw was found in the RealPlayer's / HelixPlayer's function performing URL unescaping (HTTP %-escapes unescaping, e.g. %20 -> space):

http://lists.helixcommunity.org/pipermail/common-cvs/2007-July/014956.html https://helixcommunity.org/viewcvs/common/util/hxurl.cpp?view=log#rev1.24.4.1.4.1

Function always assumed % character was always followed by at least two extra hex characters. If no or only one character followed, unescaping function failed to properly detect the end of the URL string (test is done by comparing character on the current position with '\0') and continued processing content of the memory after the end of URL buffer until first '\0' was found. Depending on the content of that memory area, this could lead to buffer over-read or over-write.

Same function exists in player/hxclientkit/src/CHXClientSink.cpp too.

RealNetworks RealPlayer 10.1.0.3114 and earlier, and Helix Player 1.0.6.778 on Fedora Core 6 (FC6) and possibly other platforms, allow user-assisted remote attackers to cause a denial of service (application crash) via a malformed .au file that triggers a divide-by-zero error.