Buffer overflow in the GDI engine in Windows Live Messenger as used for Windows MSN Live 8.1 allows user-assisted remote attackers to cause a denial of service (application crash or system crash) and possibly execute arbitrary code by placing a malformed file in a new folder under the Sharing Folders path and triggering a synchronize operation through the Windows MSN Live online service possibly related to extended file attributes and possibly related to an incomplete fix for MS07-046 as demonstrated by a (1) .jpg (2) .gif (3) .wmf (4) .doc or (5) .ico file.