Maciej Korczynski

Based in France




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About the author

Maciej Korczynski is an associate professor at Grenoble Alpes University in France. His main research interests include Internet-wide passive and active security measurements, incident data analysis, vulnerability noti cations, the economics of cybersecurity, and security of Internet protocols, in particular DNS.

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SAV: Why Is Source Address Validation Still a Problem?

Despite being a known vulnerability for at least 25 years, source IP address spoofing remains a popular attack method for redirection, amplification and anonymity. Preventing these attacks requires that operators implement Source Address Validation (SAV) to ensure their networks filter packets with…

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Intercept and Inject: DNS Response Manipulation in the Wild

In November 2021, Internet users from Mexico lost access to and By the time the event was reported, the underlying problem had already gone unnoticed for quite some time. Here, we present key takeaways from our analysis of the event - carried out with RIPE Atlas - and we …

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Inferring the Deployment of Inbound Source Address Validation Using DNS Resolvers

Source Address Validation (SAV) is the best current practice (BCP 38/RFC 2827) aimed at filtering packets based on source IP addresses at the network edge. In this article, we show how to identify networks that do not deploy SAV for incoming traffic.

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