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 Font Xtra.x32 asset module responsible for parsing font structures within Director movie files (.dir). When parsing data within the PFR1 chunk, the process implicitly sign-extends a 16-bit size value and seeks pointers accordingly. It then operates upon the data it has reached which can be abused by an attacker to corrupt memory and subsequently execute arbitrary code under the context of the user running the browser.
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