CVE-2019-6468: BIND Supported Preview Edition can exit with an assertion failure if nxdomain-redirect is used
Michael McNally
mcnally at isc.org
Thu Apr 25 01:21:42 UTC 2019
CVE: CVE-2019-6468
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.
Severity: Medium
Exploitable: Remotely
Description:
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
assertion failure.
Impact:
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:
https://www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
Workarounds:
Exploitation of this defect can be effectively prevented by
disabling the nxdomain-redirect feature in the nameserver's
configuration.
Active exploits:
None known.
Solution:
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
Related documents:
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
encrypt your message using security-officer at isc.org's PGP key which
can be found here:
https://www.isc.org/downloads/software-support-policy/openpgp-key
If you are unable to use encrypted email, you may also report new
issues at: https://www.isc.org/community/report-bug/.
Note:
ISC patches only currently supported versions. When possible we
indicate EOL versions affected. (For current information on which
versions are actively supported, please see
https://www.isc.org/downloads/.)
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
Disclosure Policy.
Legal Disclaimer:
Internet Systems Consortium (ISC) is providing this notice on
an "AS IS" basis. No warranty or guarantee of any kind is expressed
in this notice and none should be implied. ISC expressly excludes
and disclaims any warranties regarding this notice or materials
referred to in this notice, including, without limitation, any
implied warranty of merchantability, fitness for a particular
purpose, absence of hidden defects, or of non-infringement. Your
use or reliance on this notice or materials referred to in this
notice is at your own risk. ISC may change this notice at any
time. A stand-alone copy or paraphrase of the text of this
document that omits the document URL is an uncontrolled copy.
Uncontrolled copies may lack important information, be out of
date, or contain factual errors.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: pEpkey.asc
Type: application/pgp-keys
Size: 13079 bytes
Desc: not available
URL: <https://lists.isc.org/pipermail/bind-announce/attachments/20190424/dd3966b8/attachment.bin>
More information about the bind-announce
mailing list