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PDF app Foxit Reader vulnerable to critical remote code execution flaw

The yet-to-be-patched vulnerability is located in the browser plugin component installed by the application, researchers say

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Foxit Reader, a PDF viewer application often used as an alternative to the more popular Adobe Reader, contains a critical vulnerability in its browser plug-in component that can be exploited by attackers to execute arbitrary code on computers.

Details about the vulnerability and how it can be exploited were publicly disclosed Monday by Andrea Micalizzi, an independent security researcher from Italy.

There is currently no official patch for the issue, according to an advisory from vulnerability intelligence and management company Secunia. The security firm rated the flaw as highly critical because it can be exploited remotely to gain system access.

"The vulnerability is caused due to a boundary error in the Foxit Reader plugin for browsers (npFoxitReaderPlugin.dll) when processing a URL and can be exploited to cause a stack-based buffer overflow via e.g. an overly long file name in the URL," Secunia said. "Successful exploitation allows execution of arbitrary code."

The vulnerability has been confirmed in npFoxitReaderPlugin.dll version 2.2.1.530, which is installed by Foxit Reader 5.4.4.1128 -- the latest version of the program. However, older versions might also be affected, Secunia said.

By default, Foxit Reader installs the plug-in for Mozilla Firefox, Google Chrome, Opera and Safari Web browsers.

In the past, Foxit Reader has been suggested by some people in the security community as a more secure and less attacked alternative to Adobe Reader. In fact, Foxit, the company that develops the application, claims on its website that Foxit Reader is "the most secure PDF reader" and is "better than Adobe PDF Reader and Acrobat." According to the company, the program is used by over 130 million users.

Foxit has yet to confirm the existence of the vulnerability and publish a security advisory about it. A report about the issue was forwarded to the company's Security Rapid Response Team for further investigation, a Foxit sales and service representative said Thursday via email. However, she could not immediately answer additional questions.

"We have confirmed the vulnerability using Firefox, Opera, and Safari," Chaitanya Sharma, advisory team lead at Secunia, said Thursday via email. "At the moment the best mitigation is to disable this add-on in browsers and use other software e.g. Adobe Reader."



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