Malformed NSEC records can cause named to terminate unexpectedly when synth-from-dnssec is enabled
CVE-2023-2829

7.5HIGH

Key Information:

Vendor
Isc
Status
Bind 9
Vendor
CVE Published:
21 June 2023

Badges

👾 Exploit Exists

Summary

A vulnerability exists in the BIND 9 DNSSEC-validating recursive resolver configured with the Aggressive Use of DNSSEC-Validated Cache option. This vulnerability allows an attacker to remotely terminate the service through the exploitation of a zone containing a malformed NSEC record. This poses a risk for DNS resolution integrity and availability, affecting systems that rely on configured BIND 9 instances for DNS queries.

Affected Version(s)

BIND 9 9.16.8-S1 <= 9.16.41-S1

BIND 9 9.18.11-S1 <= 9.18.15-S1

References

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

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

ISC would like to thank Greg Kuechle from SaskTel for bringing this vulnerability to our attention.
.