Comment 15 for bug 1325128
Revision history for this message
| Grant Murphy (gmurphy) wrote Re: nova metadata does not use a constant time compare for validating an HMAC token | #15 |
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73416ba
(Get the code!)
So if we are going to issue an advisory for this maybe we could do something like this for the impact description:
Title: Use of non-constant time comparison operation
Reporter: Alex Gaynor (Rackspace)
Products: Nova
Versions: Up to 2013.2.3, and 2014.1 to 2014.1.1
Alex Gaynor of Rackspace reported a timing attack vulnerability in Nova.
By analyzing response times to requests for instance metadata, an attacker
may be able to guess a valid instance ID signature. This could allow access
to important configuration details of another instance. Only setups
configured to proxy metadata requests via Neturon are affected.
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