Novell GroupWise is a messaging and collaborative software platform that supports email, calendaring, personal information management, instant messaging, and document management. The platform consists of the client software, which is available for Windows, Mac OS X, and Linux, and the server software, which is supported on Windows Server, NetWare, and Linux. Novell GroupWise Internet Agent is a component of Novell GroupWise and provides email services, supporting SMTP, POP, and IMAP protocols.

vCalendar is a computer file format which allows Internet users to send meeting requests and tasks to other Internet users, via email, or by sharing files with an extension of .vcs. Events which occur on a regular basis can be identified by the property name RRULE. This property defines a rule or repeating pattern for a recurring vCalendar entity.

A heap-based buffer overflow vulnerability exists in Novell GroupWise Internet Agent. Specifically, the vulnerability occurs while processing RRULE data inside a vCalendar object. An attacker can exploit this vulnerability by sending a crafted vCalendar to the Novell GroupWise server. Successful exploitation would allow for arbitrary code injection and execution with the privileges of the Internet Agent service. Code injection that does not result in execution would terminate the service.

The vulnerability has been assigned as CVE-2011-2662.

SonicWALL has released an IPS signature to detect and block specific exploitation attempts targeting this vulnerability. The signature is listed below:

• 6033 Novell GroupWise Internet Agent RRULE Buffer Overflow