QID 15143

Date Published: 2023-07-10

QID 15143: ISC BIND Denial Of Service (DOS) Vulnerability Caused by Malformed NSEC

ISC BIND (Berkley Internet Domain Name) is an implementation of DNS protocols.

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. Affected software:
BIND 9 9.16.8-S1 -> 9.16.41-S1
BIND 9 9.18.11-S1 -> 9.18.15-S1

Patched Versions:
9.16.42-S1
9.18.16-S1

QID Detection Logic:
This unauthenticated check detects vulnerable systems by fetching the version information from the BIND service.

Successful exploitation may allow an attacker cause named to terminate unexpectedly.

CVSS V3 rated as High - 7.5 severity.

CVSS V2 rated as High - 7.8 severity.

Solution

Customers are advised to upgrade to the patched version 9.16.42-S1,9.18.16-S1 or latest release of ISC BIND.Workaround:
Setting synth-from-dnssec to no prevents the problem.

Vendor References

BIND CVE-2023-2829 - kb.isc.org/v1/docs/cve-2023-2829

CVEs related to QID 15143

CVE-2023-2829 |

Software Advisories

Advisory ID	Software	Component	Link
cve-2023-2829			kb.isc.org/v1/docs/cve-2023-2829

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