The Exchange Collaboration Data Objects (EXCDO) functionality in Microsoft Exchange Server 2000 SP3, 2003 SP1 and SP2, and 2007 allows remote attackers to cause a denial of service (crash) via an Internet Calendar (iCal) file containing multiple X-MICROSOFT-CDO-MODPROPS (MODPROPS) properties in which the second MODPROPS is longer than the first, which triggers a NULL pointer dereference and an unhandled exception.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Exchange_server | Microsoft | 2000-sp3 (including) | 2000-sp3 (including) |
| Exchange_server | Microsoft | 2003-sp1 (including) | 2003-sp1 (including) |
| Exchange_server | Microsoft | 2003-sp2 (including) | 2003-sp2 (including) |
| Exchange_server | Microsoft | 2007 (including) | 2007 (including) |