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The Impact of DNS Insecurity on Time

: Jeitner, P.; Shulman, H.; Waidner, M.


50th Annual IEEE/IFIP International Conference on Dependable Systems and Networks, DSN 2020 : Proceedings : 29 June-2 July 2020, Valencia, Spain
Piscataway, NJ: IEEE, 2020
ISBN: 978-1-72815-809-9
ISBN: 978-1-72815-810-5
International Conference on Dependable Systems and Networks (DSN) <50, 2020, Online>
Conference Paper
Fraunhofer SIT ()

We demonstrate the first practical off-path time shifting attacks against NTP as well as against Man-in-the-Middle (MitM) secure Chronos-enhanced NTP. Our attacks exploit the insecurity of DNS allowing us to redirect the NTP clients to attacker controlled servers. We perform large scale measurements of the attack surface in NTP clients and demonstrate the threats to NTP due to vulnerable DNS.