The peculiar case of NSEC processing using expanded wildcard records

We discovered a vulnerability in the processing of wildcard synthesized NSEC records. The result was Unbound, Google public DNS, PowerDNS and Dnsmasq contained a flaw that made it possible to downgrade secure connections. While synthesis of NSEC records is allowed by RFC 4592 , these synthesized owner names should not be used in the NSEC processing. This does, however, happen in Unbound 1.6.7 and earlier versions. Ralph Dolmans wrote a blog post about the discovery and findings.

NLnet Labsで読む

2018/01/30 08:00、NLnet Labsが「The peculiar case of NSEC processing using expanded wildcard records」を公開しました (種別: リリース・告知)。関連する技術: Unbound、PowerDNS。