Google SketchUp before 8 does not properly handle edge geometry in SketchUp (aka .SKP) files, which allows remote attackers to execute arbitrary code via a crafted file.
http://technet.microsoft.com/en-us/security/msvr/msvr11-006
http://support.google.com/sketchup/bin/static.py?hl=en&page=release_notes.cs&rd=1