Buffer overflow in Fax4Decode in LibTIFF 3.9.4 and possibly other versions, as used in ImageIO in Apple iTunes before 10.2 on Windows and other products, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via a crafted TIFF Internet Fax image file that has been compressed using CCITT Group 4 encoding, related to the EXPAND2D macro in libtiff/tif_fax3.h.  NOTE: some of these details are obtained from third party information.