Public Vulnerability Reports

IBM Lotus Notes Applix Attachment Viewer Stack Buffer Overflow

24.05.11

BACKGROUND

IBM Corp.'s Lotus Notes software is an integrated desktop client option for accessing e-mail, calendars and applications on an IBM Corp. Lotus Domino server. More information can be found by visiting the URL below.

http://www-01.ibm.com/software/lotus/

DESCRIPTION

Remote exploitation of a stack buffer overflow vulnerability in IBM Corp.'s Lotus Notes could allow an attacker to execute arbitrary code in the context of the current user.

The vulnerability occurs during the processing of tag information contained within an Applix document. A memory copy operation within a loop may cause tag data to overflow the bounds of a stack buffer. This condition may lead to arbitrary code execution.

ANALYSIS

Exploitation of this vulnerability results in the execution of arbitrary code in the context of the user opening an attachment delivered via email. In order to be successful, an attacker must social engineer the victim into processing a specially crafted email attachment in a certain way. Specifically, the victim must open the attachment and click the view button on the attachment dialog box.

DETECTION

Lotus Notes versions 6.0, 6.5, 7.0, 8.0, 8.5 are vulnerable.

WORKAROUND

A workaround is available to disable Applix Documents within the Lotus Notes file viewer:

Open the keyview.ini file in the Lotus Notes program data directory (C:Program FilesIBMLotusNotesData) and comment out all references to assr.dll. To comment out a reference, proceed the line with a semi-colon ';'.

VENDOR RESPONSE

IBM has released patches and workarounds to address this vulnerability. For more information, consult their advisory at the following URL.

https://www-304.ibm.com/support/docview.wss?uid=swg21500034

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

07/14/2010 Initial Vendor Notification
07/27/2010 Initial Vendor Reply
05/24/2011 Coordinated Public Disclosure

CREDIT

This vulnerability was reported to iDefense by binaryhouse.net.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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