CVE-2023-4236

Summary

A flaw in the networking code handling DNS-over-TLS queries may cause named to terminate unexpectedly due to an assertion failure. This happens when internal data structures are incorrectly reused under significant DNS-over-TLS query load. This issue affects BIND 9 versions 9.18.0 through 9.18.18 and 9.18.11-S1 through 9.18.18-S1.

Affected Software

Weaknesses

Workarounds

Disabling listening for DNS-over-TLS connections (by removing listen-on ... tls ... { ... }; statements from the configuration) prevents the affected code paths from being taken, rendering exploitation impossible. However, there is no workaround for this flaw if DNS-over-TLS support is required.

ADP Enrichment

CVE Program Container

Additional References

• https://kb.isc.org/docs/cve-2023-4236
• http://www.openwall.com/lists/oss-security/2023/09/20/2
• https://www.debian.org/security/2023/dsa-5504
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IPJLLTJCSDJJII7IIZPLTBQNWP7MZH7F/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U35OARLQCPMVCBBPHWBXY5M6XJLD2TZ5/
• https://security.netapp.com/advisory/ntap-20231013-0004/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSK5V4W4OHPM3JTJGWAQD6CZW7SFD75B/

References

• https://kb.isc.org/docs/cve-2023-4236
• http://www.openwall.com/lists/oss-security/2023/09/20/2
• https://www.debian.org/security/2023/dsa-5504
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IPJLLTJCSDJJII7IIZPLTBQNWP7MZH7F/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/U35OARLQCPMVCBBPHWBXY5M6XJLD2TZ5/
• https://security.netapp.com/advisory/ntap-20231013-0004/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VSK5V4W4OHPM3JTJGWAQD6CZW7SFD75B/

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