[secdir] Secdir review of draft-ietf-xcon-event-package-01

[Yaron Sheffer <[e-mail]>]

I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG.  These comments were written primarily for the benefit of the security area directors.  Document editors and WG chairs should treat these comments just like any other last call comments.

This draft extends the existing SIP conference package by adding additional functionality (the XCON data model) and XML document patching.

The Security Considerations section references predecessor documents, and this seems reasonable to me.

One functionality comment, with security implications: Sec. 5.3 specifies that a "patch" document MUST be well formed and SHOULD be valid. I believe non-valid documents significantly increase the vulnerability "attack surface". And since the "patch" schema is extensible by design, I see no reason to not validate the document. In other words, please consider changing validation to a MUST.

Thanks,
            Yaron



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