[NT] RealPlayer vidplin.dll AVI Processing Heap Overflow

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RealPlayer vidplin.dll AVI Processing Heap Overflow
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SUMMARY

<http://www.real.com/player/?src=realplayer> RealPlayer is "a popular
media player".

A vulnerability in RealPlayer for Windows 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.

DETAILS

Vulnerable Systems:
* For Microsoft Windows:
* RealPlayer 10.5 (6.0.12.1040-1069)
* RealPlayer 10
* RealOne Player v2
* RealOne Player v1
* RealPlayer 8
* RealPlayer Enterprise

The flaw exists within the vidplin.dll file used by RealPlayer. By
specially crafting a malformed .avi movie file. When processing AVI files
RealPlayer calls upon a specific DLL, vidplin.dll, where the vulnerability
lies. Realplayer relies on a strf structure value and allocates a fixed
memory space of 0x428 that can be overflowed with values greater than the
fixed buffer size causing arbitrary code to be executed. This triggers a
heap based overflow, and reliable code execution is then possible. This
vulnerability can be trigger when a user views a webpage, or opens an .avi
file via email, instant messenger, or other common file transfer programs.

Vendor Status:
RealNetworks has released a patch for this vulnerability. The patch can be
fount at: <http://service.real.com/help/faq/security/050623_player/EN/>
http://service.real.com/help/faq/security/050623_player/EN/

ADDITIONAL INFORMATION

The information has been provided by <mailto:smanzuik@eeye.com> Steve
Manzuik.
The original article can be found at:
<http://eeye.com/html/research/advisories/AD20050623.html>
http://eeye.com/html/research/advisories/AD20050623.html

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