VIM before 6.3 and gVim before 6.3 allow local users to execute arbitrary commands via a file containing a crafted modeline that is executed when the file is viewed using options such as (1) termcap, (2) printdevice, (3) titleold, (4) filetype, (5) syntax, (6) backupext, (7) keymap, (8) patchmode, or (9) langmenu.