iDefense Security Advisory 09.26.11 - 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 weekly. Specifically, by using a negative integer for the BYWEEKNO property, it is possible to trigger a write operation beyond the bounds of an allocated heap buffer. This can lead to the corruption of memory, and the execution of arbitrary code.
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