CVE-2016-8864: A problem handling responses containing a DNAME, answer can lead to an assertion failure
bconry at isc.org
Tue Nov 1 19:59:15 UTC 2016
CVE-2016-8864: A problem handling responses containing a DNAME
answer can lead to an assertion failure
Document Version: 2.0
Posting date: 1 November 2016
Program Impacted: BIND
Versions affected: 9.0.x -> 9.8.x, 9.9.0 -> 9.9.9-P3,
9.9.3-S1 -> 9.9.9-S5, 9.10.0 -> 9.10.4-P3,
A defect in BIND's handling of responses containing a DNAME answer
can cause a resolver to exit after encountering an assertion failure
in db.c or resolver.c
During processing of a recursive response that contains a DNAME
record in the answer section, BIND can stop execution after
encountering an assertion error in resolver.c (error message:
"INSIST((valoptions & 0x0002U) != 0) failed") or db.c (error
message: "REQUIRE(targetp != ((void *)0) && *targetp == ((void
ther of these error conditions will stop,
resulting in denial of service to clients. The risk to authoritative
servers is minimal; recursive servers are chiefly at risk.
CVSSv3 Score: 7.5
CVSSv3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
For more information on the Common Vulnerability Scoring System and to
obtain your specific environmental score please visit:
Workarounds: None known.
No known active exploits but a query which could trigger the crash
was briefly discussed on a public mailing list before the domain
owner pulled the record causing the problem.
Upgrade to the patched release most closely related to your current
version of BIND.
- BIND 9 version 9.9.9-P4
- BIND 9 version 9.10.4-P4
- BIND 9 version 9.11.0-P1
BIND 9 Supported Preview edition is a feature preview version of BIND
provided exclusively to eligible ISC Support customers.
- BIND 9 version 9.9.9-S6
ISC would like to thank Tony Finch (University of Cambridge), Marco
Davids (SIDN Labs) and others for reporting and extending our
understanding of the issue.
Document Revision History:
1.0 Advance Notification 21 October, 2016
1.1 Updated versions affected; Updated Acknowledgements. 27 October,
2.0 Public Announcement, 1 November, 2016
See our BIND9 Security Vulnerability Matrix at
https://kb.isc.org/article/AA-00913 for a complete listing of
Security Vulnerabilities and versions affected.
If you'd like more information on ISC Subscription Support and
Advance Security Notifications, please visit http://www.isc.org/support/.
Do you still have questions? Questions regarding this advisory
should go to security-officer at isc.org. To report a new issue,
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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 Disclos of our current security advisory
policy and practice can
be found here: https://kb.isc.org/article/AA-00861
This Knowledge Base article https://kb.isc.org/article/AA-01434 is
the complete and official security advisory document.
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