An assertion check in BIND before 9.16.4 (that is meant to prevent going beyond the end of a buffer when processing incoming data) can be incorrectly triggered by a large response during zone transfer. An attacker who is permitted to send zone data to a server via zone transfer can exploit this to intentionally trigger the assertion failure with a specially constructed zone, denying service to clients.
An assertion check in BIND before 9.16.4 (that is meant to prevent going beyond the end of a buffer when processing incoming data) can be incorrectly triggered by a large response during zone transfer. An attacker who is permitted to send zone data to a server via zone transfer can exploit this to intentionally trigger the assertion failure with a specially constructed zone, denying service to clients.
https://kb.isc.org/docs/cve-2020-8618 https://github.com/isc-projects/bind9/commit/c3dcab5f13547b397110b960d0840406fa958f50
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