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EEYE: RealPlayer pnen3260.dll Heap Overflow
From: "Marc Maiffret" <mmaiffret () eEye com>
Date: Fri, 1 Oct 2004 10:39:15 -0700
RealPlayer pnen3260.dll Heap Overflow
October 1, 2004
August 09, 2004
High (Remote Code Execution)
RealPlayer 10.5 (126.96.36.1990 and earlier)
RealPlayer 8 (Local Playback)
RealOne Player V2
RealOne Player V1
RealPlayer 10 Beta for Mac OS X (Local Playback)
RealOne Player (Local Playback)
Linux RealPlayer 10 (Local Playback)
Helix Player (Local Playback)
eEye Digital Security has discovered a critical vulnerability in
RealPlayer. The vulnerability allows a remote attacker to reliably
overwrite heap memory with arbitrary data and execute arbitrary code in
the context of the user who executed the player.
This specific flaw exists within the pnen3260.dll file used by
RealPlayer. By specially crafting a malformed .rm movie file along with
a SMIL file, a direct heap overwrite is triggered, and reliable code
execution is then possible.
The code in pnen3260.dll among other things is responsible for handling
.rm files. The vulnerability is triggered by setting the length field of
the VIDORV30 data chunk to 0xFFFFFFF8 - 0xFFFFFFFF this will cause an
integer overflow which leads to a small block of memory being allocated,
we call this movie from a SMIL file to handle the initial exception,
eventually overflowing the buffer.
Retina Network Security Scanner has been updated to identify this
RealNetworks has released a patch for this vulnerability. The patch is
available via the "Check for Update" menu item under Tools on the
RealPlayer menu bar.
Discovery: Karl Lynn
Retina Network Security Scanner - Free 15 Day Trial
Joel Degan, Mark Dowd, Bruce Felker, Mike Puterbaugh, Las Vegas craps
tables and the coolers.
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- EEYE: RealPlayer pnen3260.dll Heap Overflow Marc Maiffret (Oct 01)