IBM Lotus Notes LZH Attachment Viewer Stack Buffer Overflow
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.
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 header information contained within a LZH archive file. A length calculation may cause an integer value to underflow and result in a large length value. A memory copy operation using the length value may cause LZH data to overflow the bounds of a stack buffer. This condition may lead to arbitrary code execution.
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.
Lotus Notes versions 6.0, 6.5, 7.0, 8.0, 8.5 are vulnerable.
A workaround is available to disable LZH archive files 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 lzhsr.dll. To comment out a reference, proceed the line with a semi-colon ';'.
IBM has released patches and workarounds to address this vulnerability. For more information, consult their advisory at the following URL.
A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.
08/18/2010 Initial Vendor Notification
08/18/2010 Initial Vendor Reply
05/24/2011 Coordinated Public Disclosure
This vulnerability was reported to iDefense by binaryhouse.net.
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