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======= Summary ======= Name: Bit51 Better WP Security Plugin - Unauthenticated Stored XSS to RCE Release Date: 30 July 2013 Reference: NGS00500 Discoverer: Richard Warren <richard.warren@nccgroup.com> Vendor: Bit51 Vendor Reference: Systems Affected: Bit51 Better WP Security Plugin Version 3.4.8/3.4.9/3.4.10/3.5.2/3.5.3 Risk: High Status: Published ======== TimeLine ======== Discovered:1 April 2013 Released:1 April 2013 Approved:1 April 2013 Reported:1 April 2013 Fixed: 21 July 2013 Published: 30 July 2013 =========== Description =========== Bit51 Better WP Security Plugin Version 3.4.8/3.4.9/3.4.10/3.5.2/3.5.3- Unauthenticated Stored XSS to RCE I. VULNERABILITY ------------------------- The Better Security WordPress Plugin suffers from a stored XSS vulnerability, which can be exploited by a remote unauthenticated attacker to steal cookies or gain privileged access to the affected site. II. BACKGROUND ------------------------- Better WP Security takes the best WordPress security features and techniques and combines them in a single plugin thereby ensuring that as many security holes as possible are patched without having to worry about conflicting features or the possibility of missing anything on your site. With one-click activation for most features as well as advanced features for experienced users Better WP Security can help protect any site. http://bit51.com/software/better-wp-security/ ================= Technical Details ================= The Better Security WordPress plugin logs all 404 errors within the "logs" tab. By purposefully requesting a non-existent page containing an XSS payload a 404 error will be generated. When the admin clicks on the logs lab, the XSS payload will be triggered and cookies can be stolen, or some onsite request forgery can be carried out to gain admin access. Note - there are possibly a few other vectors for XSS through the logs. In addition to 404s, username login attempts, user-agents and other potentially interesting parameters are logged. Single quotes are escaped, but this can be bypassed easily. Also the request must be made through burp or a script as browsers will URL encode it. A proof of concept request can be found below: ============================================================== GET /xss.php?payload="><script>alert(String.fromCharCode(88,83,83))</script> HTTP/1.1 Host: example.com User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:15.0) Gecko/20100101 Firefox/15.0.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Language: en-us,en;q=0.5 Accept-Encoding: gzip, deflate DNT: 1 Proxy-Connection: keep-alive Cookie: wordpress_cookies..... =============================================================== =============== Fix Information =============== Better WP Security 3.5.4 has been released, which includes a fix for this issue. NCC Group Research http://www.nccgroup.com/research For more information please visit <a href="http://www.mimecast.com">http://www.mimecast.com<br> This email message has been delivered safely and archived online by Mimecast. </a> |
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