Last Call Review of draft-ietf-mmusic-sdp-mux-attributes-13
review-ietf-mmusic-sdp-mux-attributes-13-secdir-lc-lonvick-2016-07-28-00

  
  
    Apologies for the duplication - resending to the right alias.







On 7/24/16 9:39 AM, Chris Lonvick
      wrote:








      
      Hi,





      
      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. 





      
      I've been rather busy and haven't had time to thoroughly review
      this document. But I did look at the Security Considerations
      section and will recommend that some additions be made. The
      Security Considerations section says, "This document does not add
      any new security considerations beyond the existing considerations
      in the RFCs for protocols that are being multiplexed together. "
      (First paragraph.) I believe that it would be helpful to readers
      and implementers if the specification were to give pointers to
      RFCs for protocols that are being multiplexed together, and their
      security considerations.





      
      
      The section continues by saying, "The ways that SRTP streams are
      keyed is not believed to create any two-time pad vulnerability for
      the currently defined SRTP keying mechanism." (Second paragraph.)
      I may not have seen it but I don't believe that this document
      specifies keying for SRTP streams, but only references RFC4567
      (Section 5.35) and
      
      RFC4572 (Section 5.36). If that's the case, then this document
      doesn't need to opine about possible vulnerabilities in that area;
      leave it to those or subsequent documents to make that analysis. 





      It would be appropriate to reiterate that the CAUTION category may
      produce some problems.





      For completeness, it may be good to include pointers to other
      mmusic and SDP documents that have addressed security aspects. A
      statement of how that may apply to this specification would be
      appropriate. I don't think this would need to be detailed. 





      Best regards,


      Chris