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.