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Advisory for local file discovery through Internet Explorer (Adobe Reader 7.0, Acrobat 7.0 on Windows)

Advisory Name: Local file discovery in Adobe Reader and Acrobat through Internet Explorer

Release Date: April 1, 2005

Product: Adobe Reader 7.0 and earlier; Adobe Acrobat 7.0 and earlier

Platform: Windows

Vulnerability Identifier: CAN-2005-0035

Overview: A vulnerability within the Adobe Reader and Acrobat web control has been identified. Under certain circumstances, if the Internet Explorer ActiveX control is directly invoked by a web page, it is possible to discover the existence of local files by monitoring the behavior of certain methods.

Adobe has solutions available that can resolve these issues. Refer to the Recommendations section in this document for further information.

Effect: If exploited, it may be possible to discover the existence of local files on an end-user system running Internet Explorer on Windows. Note that the contents of the file are not read or exposed.

Details: One of the methods exposed by ActiveX in Internet Explorer can be used to trigger a flaw in the Adobe browser control. An attacker would be able to determine what specifically queried files exist on the user's system, although the contents of the file are not accessible.

However, the impact is minimized due to the fact that the existence of local files can only be discovered if the complete file names and paths are known in advance by the attacker and the recipient is running Internet Explorer.

Recommendations:

-- If you use Adobe Reader 7.0, download the update to Adobe Reader 7.0.5 or later at www.adobe.com/support/downloads.

-- If you use earlier versions of Adobe Reader, download Adobe Reader 7.0 at www.adobe.com/products/acrobat/readstep2.html , and install it. Then, download and install the Adobe Reader 7.0.5 update from www.adobe.com/support/downloads.

-- If you use Adobe Acrobat 7.0, download and install the Adobe Acrobat 7.0.5 or later update from www.adobe.com/support/downloads .

-- If you use earlier versions of Adobe Acrobat, upgrade to Adobe Acrobat 7.0, and then download and install the Adobe Acrobat 7.0.5 update from www.adobe.com/support/downloads.

Caveats: None

Vulnerability Identifier Cross-Reference: CVE ID: CAN-2005-0035

Acknowledgment: Adobe would like to thank the UK National Infrastructure Security Co-ordination Centre (NISCC) and Robert Fly, Hyperdose Security for reporting the issue.

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Last edited - 06/05/2006

 

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