Hi,

We are running CAS 4.1.9 overlay. Our security team, after app scanning, 
has reported that CAS has a security vulnerability:  Cross-frame scripting 
which allows clickjacking.  Basically, CAS allows itself to be framed in 
another app.  

If I understand it correctly, an attacker will use iframe to frame the 
login page, overlay the UI elements on Login form. User types in user 
credential and click on Login, but, the credential is submitted first to 
attacker's server, then, the form is submitted again to CAS server. User 
gets in, he won't see difference, but the attacker already has user 
credentials. 

Their solution is to X-Frame-Option header on web server, that is quite 
simple, no code change.

Is this a vulnerability? It sounds so to me. 

is there a list of things that we need to do in order secure CAS?  I did 
not see any mention of this on CAS Security Guide page. 

Thanks,
Yan

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