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Subject: RE: Threat assessment, some dissent RE: [ebxml-msg] security problemwith ebXML MS
Jim and Suresh, In my earlier long message I tried to summarize: 1. what kind of threats might be provided 2. under what transport/packaging conditions given the typical processing of 3. ebXML messages. I considered a number of possible kinds of threats. Apparently Jim thinks it is only the threat of misdirection that should be of concern. So, for that threat, these considerations still stand: 1. ebXML messaging processing does not need to trust internal MIME content-type values. 2. content-id values, if changed, will almost certainly lead to an error condition when they are used as part of XMLDsig signatures. 3. CPA based agreements can be used to: a. check that internal mime content-types are as expected. MIME error can be thrown if enforced. b. add digital enveloping that can encrypt the entire MIME chunk, including the headers (using 1847 security packaging if you like, Jim!) Given all of this existing apparatus permitting strong counters for the situation of MITM header tweaking, if you still wish to mandate an additional new security mechanism, I urged you to hold off until the next iteration. By then, maybe XMLEncryption will be stable or other security proposals may have emerged that can be cited. Maybe a tweak to the mid: or cid: URIs that would permit mid: sub-segments-- who knows? ebXML messaging is IMO not primarily engaged in inventing new security solutions and countermeasures, but instead is involved in adopting existing stable solutions to achieve an acceptable coverage for the standard threats (spoofing, alteration, and sniffing). I would rather retrofit to a dedicated security groups carefully examined spec. than try to throw something together at the last minute (and we are at the last minute for 1.1). Dale
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