The SVR4 /dev/wabi special device file in NetBSD 1.3.3 and earlier allows a local user to read or write arbitrary files on the disk associated with that device.
The at program in IRIX 6.2 and NetBSD 1.3.2 and earlier allows local users to read portions of arbitrary files by submitting the file to at with the -f argument, which generates error messages that at sends to the user via e-mail.