On 02/06/2011, at 1:00 AM, Eran Hammer-Lahav wrote:

> This was suggested before, but are there really attack vectors for this?

If not having a current, working attack to demonstrate is a valid way to shrug 
off a security concern, that's great; it'll be a useful approach to many of the 
discussions I have. :)


> The problem is that content-type is a pretty flexible header, which means 
> normalization of the header will be required (case, parameter order, white 
> space, etc.).

The media type is the important part, and it's much more constrained.


> I would argue that if you are using MAC with body hash and an attacker 
> changing the media type can cause harm, you should use additional methods to 
> secure the content-type (such as making the body self-describing).


That seems like a step backwards, considering all of the work that Adam has put 
into limiting the use of sniffing.

Cheers,

--
Mark Nottingham   http://www.mnot.net/



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