"value":"When incoming DNS over HTTPS support is enabled using the nghttp2 provider, and queries are routed to a tcp-only or DNS over TLS backend, an attacker can trigger an assertion failure in DNSdist by sending a request for a zone transfer (AXFR or IXFR) over DNS over HTTPS, causing the process to stop and thus leading to a Denial of Service. DNS over HTTPS is not enabled by default, and backends are using plain DNS (Do53) by default.\n\n"
"value":"<p>Option 1: refuse incoming XFR requests via a DNSdist rule: addAction(OrRule({QTypeRule(DNSQType.AXFR), QTypeRule(DNSQType.IXFR)}), RCodeAction(DNSRCode.REFUSED)). Option 2: switch to the legacy h2o provider by setting library='h2o' in the addDOHLocal directive</p>"
}
],
"value":"Option 1: refuse incoming XFR requests via a DNSdist rule: addAction(OrRule({QTypeRule(DNSQType.AXFR), QTypeRule(DNSQType.IXFR)}), RCodeAction(DNSRCode.REFUSED)). Option 2: switch to the legacy h2o provider by setting library='h2o' in the addDOHLocal directive\n\n"