FreeBSD Security Advisory - Parsing a malformed DNSSEC key can cause a validating resolver to exit due to a failed assertion in buffer.c. A remote attacker can deliberately trigger the failed assertion which will cause an affected server to terminate, by using a query that requires a response from a zone containing a malformed key, resulting in a denial of service condition. Recursive servers are at greatest risk, however, an authoritative server could also be affected, if an attacker controls a zone that the server must query against to perform its zone service.
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