DNS May Be Hazardous to Your Health

Presented at DEF CON 21 (2013), Aug. 3, 2013, 5 p.m. (45 minutes)

The largest manufacturer of laptops, one of the largest consulting firms, and a big data behemoth all walk into a bar...

His research explores many self-inflicted gaps that continue to plague even the largest companies. These gaps are often seen as trivial and ignored, thus making all of their DNS investments lead to a false sense of security. Too much effort and trust go into vendor solutions when 'common sense' and 'due diligence' were never deliverables requested in the RFP. Before we invest in securing our domains, it may be wise to ensure we own them. Before we harden our resolvers to prevent poisoning, maybe we should ensure our clients are querying what is expected. Before we make operational decisions about how client resolver settings should be configured, maybe should consider the consequences to DNS behavior. Before we call DNS secure, maybe we should understand what it is doing.


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