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Novell GroupWise iCal RRULE Time Conversion Invalid Array Indexing Vulnerability

26.09.11

BACKGROUND

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

http://www.novell.com/products/groupwise/

DESCRIPTION

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.

ANALYSIS

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.

DETECTION

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

WORKAROUND

iDefense is currently unaware of any workaround for this issue.

VENDOR RESPONSE

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

http://www.novell.com/support/search.do?cmd=displayKC&docType=kc&externalId=7009216&sliceId=1&docTypeID=DT_TID_1_1&dialogID=269227180&stateId=0%200%20269229135

CVE INFORMATION

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 (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

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

CREDIT

The discoverer of this vulnerability wishes to remain anonymous.

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LEGAL NOTICES

Copyright © 2011 Verisign, Inc.

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Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.