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From "Thomas Andraschko (JIRA)" <...@myfaces.apache.org>
Subject [jira] [Commented] (MYFACES-4133) Don't deserialize the ViewState-ID if the state saving method is server
Date Sat, 18 Nov 2017 12:31:01 GMT

    [ https://issues.apache.org/jira/browse/MYFACES-4133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258051#comment-16258051
] 

Thomas Andraschko commented on MYFACES-4133:
--------------------------------------------

My attached patch is not enough, we would also need to switch the view-state-id keyGenerator
as currently sequence is used. We must use something random / uuid.

> Don't deserialize the ViewState-ID if the state saving method is server
> -----------------------------------------------------------------------
>
>                 Key: MYFACES-4133
>                 URL: https://issues.apache.org/jira/browse/MYFACES-4133
>             Project: MyFaces Core
>          Issue Type: Bug
>          Components: General
>    Affects Versions: 2.2.12
>            Reporter: Peter Stöckli
>             Fix For: 2.3.0
>
>         Attachments: MYFACES-4133.patch
>
>
> Currently the ViewState-ID provided by the user is deserialized via Java deserialization
even when the {{javax.faces.STATE_SAVING_METHOD}} is set to {{server}} (the default).
> The deserialization in this case is unecessary and most likely even slower than just
sending the ViewState Id directly.
> If a developer now disables the ViewState encryption by setting {{org.apache.myfaces.USE_ENCRYPTION}}
to {{false}} (against the [MyFaces security advice|https://wiki.apache.org/myfaces/Secure_Your_Application])
he might have unintentionally introduced a dangerous remote code execution (RCE) vulnerability
as described [here|https://www.alphabot.com/security/blog/2017/java/Misconfigured-JSF-ViewStates-can-lead-to-severe-RCE-vulnerabilities.html].
> This has been discussed before on [Issue MYFACES-4021|https://issues.apache.org/jira/browse/MYFACES-4021].



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