CVE-2019-6468: BIND Supported Preview Edition can exit with an assertion failure if nxdomain-redirect is used
mcnally at isc.org
Thu Apr 25 01:21:42 UTC 2019
Document version: 2.0
Posting date: 24 April 2019
Program impacted: BIND
Versions affected: BIND Supported Preview Edition version
9.10.5-S1 -> 9.11.5-S5. ONLY BIND Supported
Preview Edition releases are affected.
In BIND Supported Preview Edition, an error in the nxdomain-redirect
feature can occur in versions which support EDNS Client Subnet
(ECS) features. In those versions which have ECS support, enabling
nxdomain-redirect is likely to lead to BIND exiting due to
If nxdomain-redirect is enabled (via configuration) in a vulnerable
BIND release, a malicious party can cause BIND to exit by
deliberately triggering the bug.
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 Supported Preview Edition is a special feature preview
branch of BIND provided to eligible ISC support customers.
- BIND 9.11.5-S6
- BIND 9.11.6-S1
Document revision history:
1.0 Early Notification, 15 April 2019
1.1 Added reference to BIND 9.11.6-S1 in Solution section
2.0 Public Disclosure, 24 April 2019
See our BIND 9 Security Vulnerability Matrix for a complete listing
of security vulnerabilities and versions affected.
Do you still have questions? Questions regarding this advisory
should go to security-officer at isc.org. To report a new issue, please
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issues at: https://www.isc.org/community/report-bug/.
ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which
versions are actively supported, please see
ISC Security Vulnerability Disclosure Policy:
Details of our current security advisory policy and practice can
be found in the ISC Software Defect and Security Vulnerability
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