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minvws / nl-covid19-notification-app-coordination

CoronaMelder Documentation and Repo Overview
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Blinding potentially leaks information #37

Open ryanbnl opened 4 years ago

ryanbnl commented 4 years ago

The latest solutions architecture mentions doing random uploads to a dummy url. The communication is covered by TLS but it can still leak information:

a. Hitting a different code path has a high chance of releasing information via timing. b. Difference in message sizes, the endpoint names are of equal length in the proposal.

They're easy to cover: you're almost certainly using a queue for /upload for scaling and as a strategy to avoid timing attacks. The messages can be dead lettered.

For B you can either add random jitter to requests or normalize the endpoint names. The latter can be handled by infra, using a url rewriter internally for example.

ryanbnl commented 4 years ago

Update: the diagram in the solution architecture is outdated; the swagger API has already moved to 8-character method names, which covers part of what I mentioned.

ijansch commented 4 years ago

Correct, point b is covered by having 8 letter requests AND padding in both request and response.

point a is covered by the api gateway that randomises timing. I'll leave this open because I have to check if point a is already in place.

JolandaVerhoef commented 4 years ago

@ijansch do you have an update on this?

github-actions[bot] commented 4 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

github-actions[bot] commented 3 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

github-actions[bot] commented 3 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

github-actions[bot] commented 3 years ago

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.