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Last Call Review of draft-campbell-sip-messaging-smime-03
review-campbell-sip-messaging-smime-03-secdir-lc-xia-2018-10-08-00

Request Review of draft-campbell-sip-messaging-smime
Requested revision No specific revision (document currently at 05)
Type Last Call Review
Team Security Area Directorate (secdir)
Deadline 2018-10-10
Requested 2018-09-12
Authors Ben Campbell , Russ Housley
Draft last updated 2018-10-08
Completed reviews Secdir Last Call review of -03 by Liang Xia (diff)
Genart Last Call review of -03 by Peter E. Yee (diff)
Assignment Reviewer Liang Xia
State Completed
Review review-campbell-sip-messaging-smime-03-secdir-lc-xia-2018-10-08
Reviewed revision 03 (document currently at 05)
Result Ready
Completed 2018-10-08
review-campbell-sip-messaging-smime-03-secdir-lc-xia-2018-10-08-00
In general, this draft is clear and well written.

I have 2 comments as below:
1. For Section 6, is it required to protect the UA capabilities negotiation
messages? Have you considered the possible downgrade attack, like: the
adversary tampered the UA capabilities negotiation message to make the UA work
without s/mime?

2. For Section 12, is there any general way to defend against the attacks from
malicious or compromised intermediaries mentioned in this section? Maybe some
guidances are helpful here.