iDefense Security Advisory 09.26.11 - Remote exploitation of a heap overflow 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 on weekdays. A heap based buffer overflow can be triggered due to the lack of checks to ensure that there is enough space in the buffer to hold all of the RRULE entry data. Novell GroupWise 8.0x up to (and including) 8.02HP2 are vulnerable.
74cad0c15a570d196b3c7330c61160de1f4e97c9b98ebe52b30ebecc7523282cVUPEN Vulnerability Research Team discovered a critical vulnerability in Novell GroupWise. The vulnerability is caused by a buffer overflow error in the "gwwww1.dll" module when processing the "TZID" variable within VCALENDAR data, which could be exploited by remote unauthenticated attackers to execute arbitrary code with SYSTEM privileges. Novell GroupWise versions 8.02 HP 1 (Hot Patch 1) and prior are affected.
557a0d52962a3aa35a46283e0d6a0cfda538de61310dc2fbd2a456f7e11679c3Zero Day Initiative Advisory 11-027 - This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Novell GroupWise. Authentication is not required to exploit this vulnerability. The specific flaw exists within the gwwww1.dll module responsible for parsing VCALENDAR data within e-mail messages. When the code encounters a TZID variable it allocates up to 0xFFFF bytes for the variable's value. It then proceeds to copy the value into the fixed-length buffer without checking if it will fit. By specifying a large enough string in the e-mail, an attacker can overflow the buffer and execute arbitrary code under the context of the SYSTEM user.
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