CVE-2022-3736

named configured to answer from stale cache may terminate unexpectedly while processing RRSIG queries

Description

BIND 9 resolver can crash when stale cache and stale answers are enabled, option `stale-answer-client-timeout` is set to a positive integer, and the resolver receives an RRSIG query. This issue affects BIND 9 versions 9.16.12 through 9.16.36, 9.18.0 through 9.18.10, 9.19.0 through 9.19.8, and 9.16.12-S1 through 9.16.36-S1.

Remediation

Solution:

  • Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.37, 9.18.11, 9.19.9, or 9.16.37-S1.

Workaround:

  • Setting `stale-answer-client-timeout` to `0` or to `off/disabled` will prevent BIND from crashing due to this issue.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 1.14% Top 25%
Vendor Advisory isc.org
Affected: ISC BIND 9
Published at:
Updated at:

References

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

Frequently Asked Questions

What is the severity of CVE-2022-3736?
CVE-2022-3736 has been scored as a high severity vulnerability.
How to fix CVE-2022-3736?
To fix CVE-2022-3736: Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.37, 9.18.11, 9.19.9, or 9.16.37-S1.
Is CVE-2022-3736 being actively exploited in the wild?
It is possible that CVE-2022-3736 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-3736?
CVE-2022-3736 affects ISC BIND 9.
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