NGSSoftware Insight Security Research Advisory Name: Multiple Buffer Overruns RealOne / RealPlayer / RealOne Enterprise Desktop Systems Affected: Windows All Severity: Critical Category: Remote Buffer Overrun Vendor URL: http://www.real.com/ Author: Mark Litchfield (markat_private) Date: 22nd November 2002 Advisory number: #NISR22112002 Description *********** RealOne / RealPlayer is one of the most widely used products for internet media delivery. According to Real, there are currently around 115 million users worlwide of these products. RealOne is the updated version of RealPlayer. Both suffer from multiple overrun issues. Details ******* This advisory details three remotely exploitable overruns, two being heap based overflows and the other being a stack based overflow. On exploitation of these overruns any supplied code would execute in the security context of the logged on user. 1) By following a link to a SMIL file (Synchronized Multimedia Integration Language), RealPlayer will automatically download the file in an attempt to play its content. By suppling an overly long paramter within the SMIL file a heap overflow would occur in RealPlay.exe. According to Real, they have fixed the issue by fixing the player status code to handle the cases where there are large number of characters in the metadata of a smil file. 2) By suppling an overly long rtsp:// filename parameter, for example within a .m3u file, when a link was followed, Real again would download the file. When play is selected a heap overflow ocurrs in RealPlay.exe This has apparently been fixed by Real by improving the robustness of URL handling in this portion of the product. 3) Again, referring to number two if the 'victim' were to download the file with a large filename (whether it was on local/rtsp or an http url) Real Player would access violate when performing the following: If the user were to right click in Now Playing and select "Edit Clip info" or right click in "Now Playing" and "Select copy to my Library". In this particular instance a stack overflow would occur in RealPlayer. Fix Information *************** NGSSoftware alerted Real to these problems on the 1st November 2002. NGSSoftware highly recommend installing the patch found at http://service.real.com/help/faq/security/bufferoverrun_player.html. Alternatively if you Open RealPlayer - Help - About Real Player, you will notice a Check For Updates feature. Select this. In Real's own advisory they omit the fact that RealOne Enterprise Desktop is also vulnerable, but only to issues 2 & 3. Further Information ******************* For further information about the scope and effects of buffer overflows, please see http://www.ngssoftware.com/papers/non-stack-bo-windows.pdf http://www.ngssoftware.com/papers/ntbufferoverflow.html http://www.ngssoftware.com/papers/bufferoverflowpaper.rtf http://www.ngssoftware.com/papers/unicodebo.pdf
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