The HttpOnly flag is an additional flag included in a Set-Cookie HTTP response header. Caution. A person, commonly used during the Roaring 20's in America and old detective films depicting said time period. A small text file stored in your computer when accessing websites, sometimes helpful (saving login information for future logins), often used for malicious purposes (tracking movements on web, spam) 3. As you may have noticed, in this particular example, the Session Cookie Missing ‘HttpOnly’ Flag was already fixed.. Thanks goes to Brian Rectanus from Breach for working with me to get the Header directive syntax correct. Meaning no JS can read it, including any external scripts. Checking the header using cURL: $ curl -I https://www.itnota.com Before HTTP/1.1 200 OK Cache-Control: private, no-store, max-age=0, s-maxage=0 Content-Type: text/html; charset=utf-8 Content-Encoding: gzip Vary: Accept-Encoding Server: Microsoft-IIS/8.5 Set-Cookie… Even with those caveats, I believe HttpOnly cookies are a huge security win. If a browser does not support HTTPOnly and a website attempts to set an HTTPOnly cookie, the HTTPOnly flag will be ignored by the browser, thus creating a traditional, script accessible cookie. It makes it more secure and resistant to attacks like Cross-site scripting , or one of your dependencies being malicious. Noun 1. Here you can see that document.cookie doesn’t return our session cookie. But now we have another — SameSite. That indicates that httpOnly is enabled. Header set Set-Cookie "%{http_cookie}e; HTTPOnly" env=http_cookie. Consider using Secure Sockets Layer (SSL) to help protect against this. The last decade I was teaching my students the five cookie attributes: “path, domain, expire, HttpOnly, Secure”. The ColdFusion 9.0.1 update added a server-wide setting to add the httponly attribute to all session cookies created by ColdFusion (such as the CFID and CFTOKEN cookies, or the JSESSIONID cookie on JRun). Food of the gods. This is how it looks after adding the httpOnly flag: cookie set with httpOnly flag. Setting the HttpOnly property to true does not prevent an attacker with access to the network channel from accessing the cookie directly. HttpOnly cookies don't make you immune from XSS cookie … The end result of this ruleset is that ModSecurity+Apache can transparently add on the HTTPOnly cookie flag on the fly to any Set-Cookie data that you define. HttpCookie myHttpCookie = new HttpCookie("LastVisit", DateTime.Now.ToString()); // By default, the HttpOnly property is set to false // unless specified otherwise in configuration. Notice the tick mark in the HTTP property. What does HttpOnly cookie mean? Delicious delicacies 2. It is used to prevent a Cross-Site Scripting exploit from gaining access to the session cookie and hijacking the victim’s session. To enable this setting, if you are running a JRun J2EE installation or multi-server installation, you must edit jvm.config, otherwise you can enable this setting from the CF Administrator. The browser will take care of the rest. A cookie marked with HttpOnly will not be accessible through JavaScript and the document.cookie property. This is directly from the MSDN docs: // Create a new HttpCookie. As a result, the cookie (typically the session cookie) becomes vulnerable to theft or modification by a malicious script running on the client system. If I -- er, I mean, if my friend -- had implemented HttpOnly cookies, it would have totally protected his users from the above exploit! 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