CVE-2023-2829

Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is enabled

Published Jun 21, 2023 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
A `named` instance configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSSEC-Validated Cache (RFC 8198) option (`synth-from-dnssec`) enabled can be remotely terminated using a zone with a malformed NSEC record.
This issue affects BIND 9 versions 9.16.8-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1.

Remediation

Vendor Solution

Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.42-S1 or 9.18.16-S1.


Vendor Workaround

Setting `synth-from-dnssec` to `no` prevents the problem.

Tracking

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Advisories

Source ID Title
EUVD EUVD EUVD-2023-34280 A `named` instance configured to run as a DNSSEC-validating recursive resolver with the Aggressive Use of DNSSEC-Validated Cache (RFC 8198) option (`synth-from-dnssec`) enabled can be remotely terminated using a zone with a malformed NSEC record. This issue affects BIND 9 versions 9.16.8-S1 through 9.16.41-S1 and 9.18.11-S1 through 9.18.15-S1.
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}