CVE-2023-2829

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

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

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.

Workaround:

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

7.5

CVSS

Severity: High

CVSS 3.1 •

EPSS 0.07%

Vendor Advisory isc.org

Affected: ISC BIND 9

References

Link	Tags
https://kb.isc.org/docs/cve-2023-2829	vendor advisory
https://security.netapp.com/advisory/ntap-20230703-0010/	third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-2829?: CVE-2023-2829 has been scored as a high severity vulnerability.
How to fix CVE-2023-2829?: To fix CVE-2023-2829: Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.42-S1 or 9.18.16-S1.
Is CVE-2023-2829 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2023-2829 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2023-2829?: CVE-2023-2829 affects ISC BIND 9.

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