Comment 9 for bug 1325128

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Andrew Laski (alaski) wrote : Re: nova metadata does not use a constant time compare for validating an HMAC token

I would be ok with opening this up to be a public bug. The exploit is theoretical at this point, and even the included links contain theoretical attacks with no proof of concept code. And in general this token compare should not be receiving user input, though that is dependent on the deployment setup.