Multiple buffer overflows in gwwww1.dll in GroupWise Internet Agent (GWIA) in Novell GroupWise before 8.02HP allow remote attackers to execute arbitrary code via variables in a VCALENDAR message, as demonstrated by a long (1) REQUEST-STATUS, (2) TZNAME, (3) COMMENT, or (4) RRULE variable in this message.
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.