Re: [secdir] secdir review of draft-ietf-cuss-sip-uui-10
Alan Johnston <alan.b.johnston@gmail.com> Thu, 23 January 2014 19:44 UTC
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Date: Thu, 23 Jan 2014 13:44:31 -0600
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From: Alan Johnston <alan.b.johnston@gmail.com>
To: "Scott G. Kelly" <scott@hyperthought.com>
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Cc: draft-ietf-cuss-sip-uui.all@tools.ietf.org, "secdir@ietf.org" <secdir@ietf.org>
Subject: Re: [secdir] secdir review of draft-ietf-cuss-sip-uui-10
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Scott, Thanks for your review of the draft. We made some edits based on your comments a while back, so I'm pinging you to make sure they address your concerns. http://tools.ietf.org/html/draft-ietf-cuss-sip-uui Thanks! - Alan - On Thu, May 30, 2013 at 7:47 PM, Scott G. Kelly <scott@hyperthought.com>wrote: > 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 have no expertise in SIP, and am providing this review as a first-level > filter for our over-worked security ADs. So, please take my comments > accordingly. Also, this review is a day late -- I hope it is still useful. > > This document defines a method for exchanging a blob of information > between user agents during SIP session establishment (User to User > Information, or UUI data) by adding a new SIP header. The data is intended > to be opaque to SIP. > > There is a related problem statement RFC (6567) that briefly describes 3 > different approaches to security, but neither document describes likely > threats. They are implicit in the 3 models described in 6567 (e.g. treat > the sip layer as "untrusted", treat the sip layer as "trusted", treat the > transport domain as "trusted"), but I found myself wishing I had more info > about real-world threats and countermeasures. > > Given that I am not a SIP expert (and don't have time to become one as > part of this review), I don't know if this is an issue or not, but this is > an impression I think worth mentioning. > > A second question relates to the binding of the UUI to its originator. The > security considerations section suggests that the UUI might carry sensitive > info requiring privacy or integrity protection, but does not mention origin > authentication. There is a hint in the next paragraph (it says > "History-Info can be used to determine the identity of the inserter"), but > the relative security of this mechanism is not clear to me. Could an > attacker forge History-Info? I don't know. What are the consequences of > such behavior? I don't know. Seems like a well-written security > considerations section would lay these questions to rest. > > Again, I have almost zero knowledge of SIP, so maybe answers are obvious > to someone steeped in SIP lore, and I apologize if this is the case. But, > these are my impressions. > > --Scott > > >
- [secdir] secdir review of draft-ietf-cuss-sip-uui… Scott G. Kelly
- Re: [secdir] secdir review of draft-ietf-cuss-sip… Alan Johnston
- Re: [secdir] secdir review of draft-ietf-cuss-sip… Scott G. Kelly
- Re: [secdir] secdir review of draft-ietf-cuss-sip… Alan Johnston