[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:[email protected]> 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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