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Novell GroupWise iCal RRULE Time Conversion Invalid Array Indexing Vulnerability



GroupWise is Novell's messaging platform, and includes support for email, calendaring, and instant messaging. More information is available at the following website:


Remote exploitation of a memory corruption vulnerability in Novell Inc.'s GroupWise could allow an attacker to execute arbitrary code with the privileges of the affected service.

This vulnerability is present in the calendar processing code, which resides within the GroupWise Internet Agent (GWIA) process. The vulnerability occurs when parsing a malformed calendar recurrence (RRULE) that recurs yearly. When parsing the recurrence time, the code incorrectly validates the bounds of an array index. This index is then used to control the offset to write to in the array, which can corrupt heap memory beyond the allocated buffer. This can lead to the execution of arbitrary code.


Exploitation of this vulnerability results in the execution of arbitrary code with the privileges of the affected service. On Windows, the GWIA process runs with SYSTEM privileges. In order to exploit this vulnerability, an attacker simply needs to send an email to a valid user, and attach the malicious calendar file to the email. The targeted user does not need to download or view the email; processing of the iCal file occurs automatically on the server as soon as the email is received by the server.


Novell GroupWise 8.0x up to (and including) 8.02HP2 are vulnerable.


iDefense is currently unaware of any workaround for this issue.


Novell has released fixes which addresses this issue. Information about downloadable vendor updates can be found by clicking on the URLs shown.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2011-2663 to this issue. This is a candidate for inclusion in the CVE list (, which standardizes names for security problems.


07/20/2011 Initial Vendor Notification
07/21/2011 Vendor Reply
09/26/2011 Coordinated Public Disclosure


The discoverer of this vulnerability wishes to remain anonymous.

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Copyright © 2011 Verisign, Inc.

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