high
7.5
CWE
617
Advisory Published
CVE Published
Updated

CVE-2023-4236: named may terminate unexpectedly under high DNS-over-TLS query load

First published: Wed Sep 20 2023(Updated: )

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.

Credit: security-officer@isc.org security-officer@isc.org security-officer@isc.org

Affected SoftwareAffected VersionHow to fix
debian/bind9<=1:9.18.16-1~deb12u1<=1:9.18.16-1
1:9.18.19-1~deb12u1
1:9.19.17-1
ISC BIND>=9.18.0<9.18.18
ISC BIND=9.18.11-s1
ISC BIND=9.18.18-s1
debian/bind9
1:9.11.5.P4+dfsg-5.1+deb10u7
1:9.11.5.P4+dfsg-5.1+deb10u10
1:9.16.44-1~deb11u1
1:9.16.48-1
1:9.18.19-1~deb12u1
1:9.18.24-1
1:9.19.21-1
Fedoraproject Fedora=37
Fedoraproject Fedora=38
Fedoraproject Fedora=39
Debian Debian Linux=10.0
Debian Debian Linux=11.0
All of
Netapp H300s Firmware
Netapp H300s
All of
Netapp H500s Firmware
Netapp H500s
All of
Netapp H700s Firmware
Netapp H700s
All of
Netapp H410s Firmware
Netapp H410s
All of
Netapp H410c Firmware
Netapp H410c
ubuntu/bind9<1:9.18.12-0ubuntu0.22.04.3
1:9.18.12-0ubuntu0.22.04.3
ubuntu/bind9<1:9.18.12-1ubuntu1.2
1:9.18.12-1ubuntu1.2
ubuntu/bind9<1:9.18.18-0ubuntu2
1:9.18.18-0ubuntu2
ubuntu/bind9<1:9.18.18-0ubuntu2
1:9.18.18-0ubuntu2
ubuntu/bind9<9.18.19
9.18.19
>=9.18.0<9.18.18
=9.18.11-s1
=9.18.18-s1
=37
=38
=39
=10.0
=11.0
All of
All of
All of
All of
All of

Remedy

Upgrade to the patched release most closely related to your current version of BIND 9: 9.18.19 or 9.18.19-S1.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2023-4236?

    CVE-2023-4236 is a vulnerability in BIND 9, the DNS server software developed by ISC.

  • How does CVE-2023-4236 affect BIND 9?

    CVE-2023-4236 affects BIND 9 versions 9.18.0 through 9.18.18.

  • What is the severity of CVE-2023-4236?

    The severity of CVE-2023-4236 is rated as high, with a CVSS score of 7.5.

  • What is the impact of CVE-2023-4236?

    CVE-2023-4236 may cause the 'named' process to terminate unexpectedly due to an assertion failure, leading to a denial of service (DoS) condition.

  • How can I mitigate CVE-2023-4236?

    To mitigate CVE-2023-4236, it is recommended to update BIND 9 to a version that includes the necessary fixes, such as 9.18.19.

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