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http://jira.magnolia-cms.com/browse/MAGNOLIA-3248?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=29019#action_29019
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Grégory Joseph commented on MAGNOLIA-3248:
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We could additionally drop cookies when logging in/out, but I'm unsure if/how 
this would affect cookie-less users.
Tomcat provides valves that actually take care of this problem: 
http://tomcat.apache.org/tomcat-5.5-doc/config/valve.html - but these are only 
useful when using tomcat's own auth system, and use tomcat-specific code to 
achieve the id change.

> Invalidate session
> ------------------
>
>                 Key: MAGNOLIA-3248
>                 URL: http://jira.magnolia-cms.com/browse/MAGNOLIA-3248
>             Project: Magnolia
>          Issue Type: Improvement
>          Components: core, security
>    Affects Versions: 4.3.2
>            Reporter: Grégory Joseph
>            Assignee: Philipp Bärfuss
>             Fix For: 4.3.x
>
>
> Two issues in one:
> * when logging out, the session is invalidated, but somehow a session gets 
> recreated with the same ID as previously (but session.isNew() is true) for 
> the anonymous user (while there is no session for anonymous users if no 
> session existed previously)
> * when logging in, the existing session is *not* invalidated, and likewise, 
> the same session ID is kept.
> This behavior is seen as a threat by security inspecting systems. At the very 
> least, we should indeed invalidate an existing session when logging in.

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