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Vulnerability in Adobe Reader, Acrobat Reader

August 16, 2004

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Security firm iDefense warns that a flaw in Adobe Systems' Reader 6.x and Acrobat Reader 5.x could be exploited via a malicious Web site to execute arbitrary code. According to iDefense's advisory, the vulnerability is caused by a boundary error in the "pdf.ocx" ActiveX component supplied with Adobe Acrobat Reader.

"This can be exploited via a malicious Web site using a specially crafted URL to potentially execute arbitrary code," iDefense said. Other versions may also be affected. As a workaround, iDefense recommends users change Adobe Acrobat/Acrobat Reader settings to prevent PDFs from automatically opening when accessed by a Web browser.

"When prompted, first save the file to disk before opening, thereby closing the exploitation vector described," the advisory said.

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