On 19th of May 2020 a new DNS protocol vulnerability was made public. It was discovered by researchers from Tel Aviv University and the Interdisciplinary Center in Israel.
Disclosed vulnerability abuses DNS delegation mechanism to force DNS resolvers to generate more DNS queries to authoritative servers of attacker’s choice.
Unlike traditional random subdomain attacks, in case of this attack , the queries are generated by resolver itself. The researchers called this attack the NXNSAttack. It appears that pretty much all vendors of DNS resolvers are affected.
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