The MITRE CVE dictionary describes this issue as:
Integer overflow in the ReadImage function in plug-ins/common/file-gif-load.c in the GIF image format plug-in in GIMP 2.8.x and earlier allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via crafted height and len properties in a GIF image file, which triggers a heap-based buffer overflow. NOTE: some of these details are obtained from third party information.
Find out more about CVE-2012-3481 from the
MITRE CVE dictionary dictionary and