named configured to answer from stale cache may terminate unexpectedly while processing RRSIG queries
CVE-2022-3736

7.5HIGH

Key Information:

Vendor
Isc
Status
Bind 9
Vendor
CVE Published:
26 January 2023

Badges

👾 Exploit Exists

Summary

A flaw in the BIND 9 resolver can lead to a denial of service, causing the resolver to crash. This occurs when stale cache and stale answer handling are enabled, and the option 'stale-answer-client-timeout' is configured with a positive integer. If the resolver encounters an RRSIG query under these conditions, it may fail, interrupting DNS resolution services. This issue impacts multiple BIND 9 versions. Users are advised to review their configurations and consider updates to prevent potential disruptions.

Affected Version(s)

BIND 9 9.16.12 <= 9.16.36

BIND 9 9.18.0 <= 9.18.10

BIND 9 9.19.0 <= 9.19.8

References

https://kb.isc.org/docs/cve-2022-3736
vendor-advisory

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 Borja Marcos from Sarenet (with assistance by Iratxe Niño from Fundación Sarenet) for bringing this vulnerability to our attention.
.