CVE-2019-6467: An error in the nxdomain redirect feature can cause BIND to exit with an INSIST assertion failure in query.c
mcnally at isc.org
Thu Apr 25 01:21:38 UTC 2019
Document version: 2.0
Posting date: 24 April 2019
Program impacted: BIND
Versions affected: BIND 9.12.0-> 9.12.4, 9.14.0. Also affects all releases
in the 9.13 development branch.
A programming error in the nxdomain-redirect feature can cause
an assertion failure in query.c if the alternate namespace used
by nxdomain-redirect is a descendant of a zone that is served
The most likely scenario where this might occur is if the server,
in addition to performing NXDOMAIN redirection for recursive
clients, is also serving a local copy of the root zone or using
mirroring to provide the root zone, although other configurations
are also possible.
An attacker who can deliberately trigger the condition on a
server with a vulnerable configuration can cause BIND to exit,
denying service to other clients.
CVSS Score: 5.9
CVSS Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
For more information on the Common Vulnerability Scoring System and
to obtain your specific environmental score please visit:
Exploitation of this defect can be effectively prevented by
disabling the nxdomain-redirect feature in the nameserver's
Upgrade to the patched release most closely related to your current
version of BIND:
- BIND 9.12.4-P1
- BIND 9.14.1
Document revision history:
1.0 Early Notification, 15 April 2019
1.1 Removed BIND 9.11.6-P1 from Solution version list
2.0 Public Disclosure, 24 April 2019
See our BIND 9 Security Vulnerability Matrix for a complete
listing of security vulnerabilities and versions affected.
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ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which
versions are actively supported, please see
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Details of our current security advisory policy and practice can
be found in the ISC Software Defect and Security Vulnerability
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