[keycloak-user] Is it CSRF vulnerability?

[Baskin, Ilia]

Thanks Scott,

As far as I understand now the Chapter 22. Security Vulnerabilities of Keycloak documentation talks about the security of authentication workflow. I believe it will be nice if you added clear explanation of what security the adapters provide and don’t provide after authentication.

Thanks
Ilia

From: Scott Rossillo [mailto:srossillo at smartling.com]
Sent: Saturday, February 20, 2016 10:29 AM
To: Baskin, Ilia
Cc: keycloak-user at lists.jboss.org
Subject: Re: [keycloak-user] Is it CSRF vulnerability?

Are you using the Tomcat adapter? If so you have to configure Tomcats' CSRF filter.

Once you've authenticated with an SSO server like Keycloak, you still have to use platform specific CSRF

https://tomcat.apache.org/tomcat-7.0-doc/config/filter.html#CSRF_Prevention_Filter

On Fri, Feb 19, 2016 at 6:19 PM Baskin, Ilia <ibaskine at microstrategy.com<mailto:ibaskine at microstrategy.com>> wrote:
Scott,

I know that, but this is exactly how CSRF works. There are several simple ways to defend against CSRF and I am surprised that Keycloak, a security application, doesn’t utilize any.

Thanks.
Ilia

From: Scott Rossillo [mailto:srossillo at smartling.com<mailto:srossillo at smartling.com>]
Sent: Friday, February 19, 2016 6:15 PM
To: Baskin, Ilia
Cc: keycloak-user at lists.jboss.org<mailto:keycloak-user at lists.jboss.org>
Subject: Re: [keycloak-user] Is it CSRF vulnerability?

Once you’ve authenticated with Keycloak, your application has an session id provided by Tomcat. This is why your requests are succeeding. If you examine your XHR requests, I’d assume the session id cookie is being passed to the server.


Scott Rossillo
Smartling | Senior Software Engineer
srossillo at smartling.com<mailto:srossillo at smartling.com>

On Feb 19, 2016, at 6:01 PM, Baskin, Ilia <ibaskine at microstrategy.com<mailto:ibaskine at microstrategy.com>> wrote:

Hi,

I am experimenting with Keycloak to evaluate its suitability for our application. Here is one of my experiments, that got me warried:

I created a simple page (see attached), deployed it on Tomcat and registered it in Keycloak as confidential client. As you can see the page contains a button clicking on which executes simple XHR request. Notice that XHR request doesn’t contain Authorization header. On submission of my page URL I am redirected to Keycloak for authentication. After authentication I can submit XHR requests at will.

Now I copied my page and deployed the copy on the same Tomcat as a different totally unsecured application. If I open this page in another browser tab and click on XHR button it will go through without any problem. It looks to me as a typical CSRF case. Am I missing something here?

Thanks.
Ilia
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