A vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of the Adobe Shockwave Player. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the DIRAPI.dll module distributed with the player. While parsing a director movie (.dir or .dcr) the code trusts the specified size of the IFWV chunk and uses it within a calculation to determine another offset within the file. By setting it to 0, the code jumps to the wrong location within the file. While parsing data at the new location, the code uses a value as a loop counter. Within the loop, the code copies data to a heap buffer. By crafting a file with a large enough size, this loop can be forced to corrupt memory. A remote attacker can abuse this logic to execute arbitrary code under the context of the user running the application.
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