CVE-2023-5679

Enabling both DNS64 and serve-stale may cause an assertion failure during recursive resolution

Description

A bad interaction between DNS64 and serve-stale may cause `named` to crash with an assertion failure during recursive resolution, when both of these features are enabled. This issue affects BIND 9 versions 9.16.12 through 9.16.45, 9.18.0 through 9.18.21, 9.19.0 through 9.19.19, 9.16.12-S1 through 9.16.45-S1, and 9.18.11-S1 through 9.18.21-S1.

Remediation

Solution:

  • Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.48, 9.18.24, 9.19.21, 9.16.48-S1, or 9.18.24-S1.

Workaround:

  • Disabling serve-stale (with `stale-cache-enable no;` and `stale-answer-enable no;`) and/or disabling `dns64` makes the faulty code path impossible to reach, preventing this flaw from being exploitable.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.12%
Vendor Advisory isc.org
Affected: ISC BIND 9
Published at:
Updated at:

References

Link Tags
https://kb.isc.org/docs/cve-2023-5679 vendor advisory
http://www.openwall.com/lists/oss-security/2024/02/13/1 third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/ third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/ third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/ third party advisory mailing list
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/ third party advisory mailing list
https://security.netapp.com/advisory/ntap-20240426-0002/ third party advisory

Frequently Asked Questions

What is the severity of CVE-2023-5679?
CVE-2023-5679 has been scored as a high severity vulnerability.
How to fix CVE-2023-5679?
To fix CVE-2023-5679: Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.48, 9.18.24, 9.19.21, 9.16.48-S1, or 9.18.24-S1.
Is CVE-2023-5679 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2023-5679 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-2023-5679?
CVE-2023-5679 affects ISC BIND 9.
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