mysql_error() can lead to Cross Site Scripting attacks

2006-09-21T00:00:00
ID SECURITYVULNS:DOC:14369
Type securityvulns
Reporter Securityvulns
Modified 2006-09-21T00:00:00

Description

mysql_error() can lead to Cross Site Scripting attacks ======================================================== Affected.scr..: PHP4 <= 4.4.4 PHP5 <= 5.1.6 Advisory.ID...: 11060920 Risk.level....: Low Vendor.Status.: Patched Src.download..: http://www.php.net/ Adv.link......: acid-root.new.fr/advisories/11060920.txt ========================================================

==[ OVERVIEW

PHP: Hypertext Preprocessor is an open source server side programming language extensively used for web scripts and to process data passed via the Common Gateway Interface from HTML forms etc. PHP can be written as scripts that reside on the server and may produce HTML output that downloads to the web browser. Alternatively, PHP can be embedded within HTML pages that are then saved with a .php file extension. The PHP sections of the page are then parsed by the PHP engine on the server and the PHP code stripped out before the page is downloaded to the web browser. The name is a bit of a programming joke (if there is sucha thing) since it's a recursive acronym i.e. the P in PHP stands for PHP.

==[ DETAILS

The goal of the mysql_error() function is to return the error text from the last MySQL function. This function can lead to Cross Site Scripting attacks. To conduct this attack, some parameters are required. If an mysql function use a bad parameter provided by the attacker and if the mysql_error() result is returned to the user, this can be exploited to conduct Cross Site Scripting attack. This can be useful if the attacker has a restricted access to an mysql function.

==[ POC/EXPLOIT

<?php //?db=<script>alert(666)</script> $link = mysql_connect("localhost", "root", ""); mysql_select_db($db, $link); echo mysql_errno($link) . ": " . mysql_error($link). "\n"; ?>

==[ LINKS

Mysql functions list.: http://www.php.net/manual/en/ref.mysql.php Discussion on php.net: http://bugs.php.net/bug.php?id=38733&edit=2

==[ SOLUTION

No response from PHP Team.

==[ TIMELINE

  1. Sept. 2006 - Vendor contacted
  2. Sept. 2006 - Public disclosure

==[ CONTACT

Author: DarkFig Web...: www.acid-root.new.fr E-mail: gmdarkfig[]gmail[]com (fr/en)

Note: Tested on 4.4.3