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Don't Forget to Lock the Front Door! Inferring the Deployment of Source Address Validation of Inbound Traffic

Abstract : This paper concerns the problem of the absence of ingress filtering at the network edge, one of the main causes of important network security issues. Numerous network operators do not deploy the best current practice - Source Address Validation (SAV) that aims at mitigating these issues. We perform the first Internet-wide active measurement study to enumerate networks not filtering incoming packets by their source address. The measurement method consists of identifying closed and open DNS resolvers handling requests coming from the outside of the network with the source address from the range assigned inside the network under the test. The proposed method provides the most complete picture of the inbound SAV deployment state at network providers. We reveal that 32 673 Autonomous Systems (ASes) and 197 641 Border Gateway Protocol (BGP) prefixes are vulnerable to spoofing of inbound traffic. Finally, using the data from the Spoofer project and performing an open resolver scan, we compare the filtering policies in both directions.
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https://hal.archives-ouvertes.fr/hal-02475931
Contributor : Yevheniya Nosyk Connect in order to contact the contributor
Submitted on : Wednesday, February 12, 2020 - 1:19:56 PM
Last modification on : Wednesday, November 3, 2021 - 6:47:20 AM
Long-term archiving on: : Wednesday, May 13, 2020 - 2:57:31 PM

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Maciej Korczyński, Yevheniya Nosyk, Qasim Lone, Marcin Skwarek, Baptiste Jonglez, et al.. Don't Forget to Lock the Front Door! Inferring the Deployment of Source Address Validation of Inbound Traffic. International Conference on Passive and Active Network Measurement, Mar 2020, Eugene, United States. ⟨10.1007/978-3-030-44081-7_7⟩. ⟨hal-02475931⟩

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